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A call centre ( Commonwealth spelling) or call center (
American spelling Despite the various list of dialects of English, English dialects spoken from country to country and within different regions of the same country, there are only slight regional variations in English orthography, the two most notable variati ...
; see spelling differences) is a managed capability that can be centralised or remote that is used for receiving or transmitting a large volume of enquiries by
telephone A telephone, colloquially referred to as a phone, is a telecommunications device that enables two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most ...
. An inbound call centre is operated by a
company A company, abbreviated as co., is a Legal personality, legal entity representing an association of legal people, whether Natural person, natural, Juridical person, juridical or a mixture of both, with a specific objective. Company members ...
to administer incoming product or service support or information inquiries from consumers. Outbound call centres are usually operated for sales purposes such as
telemarketing Telemarketing (sometimes known as inside sales, or telesales in the UK and Ireland) is a method of direct marketing in which a salesperson solicits prospective customers to buy products, subscriptions or services, either over the phone or throu ...
, for solicitation of charitable or political donations,
debt collection Debt collection or cash collection is the process of pursuing payments of money or other agreed-upon value owed to a creditor. The debtors may be individuals or businesses. An organization that specializes in debt collection is known as a coll ...
,
market research Market research is an organized effort to gather information about target markets and customers. It involves understanding who they are and what they need. It is an important component of business strategy and a major factor in maintaining com ...
, emergency notifications, and urgent/critical needs blood banks. A contact centre is a further extension of call centres telephony based capabilities, administers centralised handling of individual communications, including letters,
fax Fax (short for facsimile), sometimes called telecopying or telefax (short for telefacsimile), is the telephonic transmission of scanned printed material (both text and images), normally to a telephone number connected to a printer or other out ...
es, live support software,
social media Social media are interactive technologies that facilitate the Content creation, creation, information exchange, sharing and news aggregator, aggregation of Content (media), content (such as ideas, interests, and other forms of expression) amongs ...
, instant message, and
email Electronic mail (usually shortened to email; alternatively hyphenated e-mail) is a method of transmitting and receiving Digital media, digital messages using electronics, electronic devices over a computer network. It was conceived in the ...
. A call center was previously seen as an open workspace for call center agents, with workstations that included a computer and display for each agent and were connected to an inbound/outbound call management system, and one or more supervisor stations. It can be independently operated or networked with additional centers, often linked to a corporate
computer network A computer network is a collection of communicating computers and other devices, such as printers and smart phones. In order to communicate, the computers and devices must be connected by wired media like copper cables, optical fibers, or b ...
, including mainframes, microcomputer, servers and LANs. It is expected that
artificial intelligence Artificial intelligence (AI) is the capability of computer, computational systems to perform tasks typically associated with human intelligence, such as learning, reasoning, problem-solving, perception, and decision-making. It is a field of re ...
-based
chatbot A chatbot (originally chatterbot) is a software application or web interface designed to have textual or spoken conversations. Modern chatbots are typically online and use generative artificial intelligence systems that are capable of main ...
s will significantly impact call centre jobs and will increase productivity substantially. Many organisations have already adopted AI-based chatbots to improve their customer service experience.Krishnan, C., Gupta, A., Gupta, A., Singh, G. (2022). Impact of Artificial Intelligence-Based Chatbots on Customer Engagement and Business Growth. In: Hong, TP., Serrano-Estrada, L., Saxena, A., Biswas, A. (eds) Deep Learning for Social Media Data Analytics. Studies in Big Data, vol 113. Springer, Cham. The contact center is a central point from which all customer contacts are managed. Through contact centers, valuable information can be routed to the appropriate people or systems, contacts can be tracked, and data may be gathered. It is generally a part of the company's
customer relationship management Customer relationship management (CRM) is a strategic process that organizations use to manage, analyze, and improve their interactions with customers. By leveraging data-driven insights, CRM helps businesses optimize communication, enhance cus ...
infrastructure. The majority of large companies use contact centers as a means of managing their customer interactions. These centers can be operated by either an in-house department responsible or outsourcing customer interaction to a third-party agency (known as Outsourcing Call Centres).


History

Answering services, as known in the 1960s through the 1980s, earlier and slightly later, involved a business that specifically provided the service. Primarily, by using an off-premises extension (OPX) for each subscribing business, connected at a switchboard at the answering service business, the answering service would answer the otherwise unattended phones of the subscribing businesses with a live operator. The live operator could take messages or relay information, doing so with greater human interactivity than a mechanical answering machine. Although undoubtedly more costly (the human service, the cost of setting up and paying the phone company for the OPX on a monthly basis), it had the advantage of being more ready to respond to the unique needs of after-hours callers. The answering service operators also had the option of calling the client and alerting them to particularly important calls. The origins of call centers date back to the 1960s with the UK-based
Birmingham Press and Mail Birmingham ( ) is a City status in the United Kingdom, city and metropolitan borough in the metropolitan county of West Midlands (county), West Midlands, within the wider West Midlands (region), West Midlands region, in England. It is the Lis ...
, which installed Private Automated Business Exchanges (PABX) to have rows of agents handling customer contacts. By 1973, call centers had received mainstream attention after Rockwell International patented its Galaxy Automatic Call Distributor (GACD) for a telephone booking system as well as the popularization of telephone headsets as seen on televised NASA Mission Control Center events. During the late 1970s, call center technology expanded to include telephone sales, airline reservations, and banking systems. The term "call center" was first published and recognised by the ''
Oxford English Dictionary The ''Oxford English Dictionary'' (''OED'') is the principal historical dictionary of the English language, published by Oxford University Press (OUP), a University of Oxford publishing house. The dictionary, which published its first editio ...
'' in 1983. The 1980s saw the development of
toll-free telephone number A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls. For the calling party, a call to a toll-free number is free of charge, unless air-charges apply for mobile telephone service. A toll-free ...
s to increase the efficiency of agents and overall call volume. Call centers increased with the deregulation of
long-distance calling In telecommunications, a long-distance call (U.S.) or trunk call (also known as a toll call in the UK ) is a telephone call made to a location outside a defined local calling area. Long-distance calls are typically charged a higher billing rate t ...
and growth in information-dependent industries. As call centres expanded, workers in
North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...
began to join unions such as the
Communications Workers of America The Communications Workers of America (CWA) is the largest communications and media labor union in the United States, representing about 700,000 members in both the private and public sectors (also in Canada and Puerto Rico). The union has 27 loc ...
and the United Steelworkers. In
Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...
, the National Union of Workers represents unionised workers; their activities form part of the
Australian labour movement The Australian labour movement began in the early 19th century and since the late 19th century has included industrial (Australian unions) and political wings (Australian Labor Party). Trade unions in Australia may be formed on the basis of cra ...
. In
Europe Europe is a continent located entirely in the Northern Hemisphere and mostly in the Eastern Hemisphere. It is bordered by the Arctic Ocean to the north, the Atlantic Ocean to the west, the Mediterranean Sea to the south, and Asia to the east ...
,
UNI Global Union UNI Global Union, formally Union Network International (UNI), is a global union federation for the skills and services sectors, uniting national and regional trade unions. It has affiliated unions in 150 countries representing 20 million workers ...
of
Switzerland Switzerland, officially the Swiss Confederation, is a landlocked country located in west-central Europe. It is bordered by Italy to the south, France to the west, Germany to the north, and Austria and Liechtenstein to the east. Switzerland ...
is involved in assisting unionisation in the call center industry, and in Germany Vereinte Dienstleistungsgewerkschaft represents call centre workers. During the 1990s, call centres expanded internationally and developed into two additional subsets of communication: contact centres and outsourced bureau centres. A contact centre is a coordinated system of people, processes, technologies, and strategies that provides access to information, resources, and expertise, through appropriate channels of communication, enabling interactions that create value for the customer and organization. In contrast to in-house management, outsourced bureau contact centres are a model of contact centre that provide services on a "pay per use" model. The overheads of the contact centre are shared by many clients, thereby supporting a very cost effective model, especially for low volumes of calls. The modern contact centre includes automated call blending of inbound and outbound calls as well as predictive dialing capabilities, dramatically increasing agents' productivity. New implementations of more complex systems require highly skilled operational and management staff that can use multichannel online and offline tools to improve customer interactions.


Technology

Call centre technologies often include:
speech recognition Speech recognition is an interdisciplinary subfield of computer science and computational linguistics that develops methodologies and technologies that enable the recognition and translation of spoken language into text by computers. It is also ...
software which allowed Interactive Voice Response (IVR) systems to handle first levels of
customer support Customer support is a range of services to assist customers in making cost effective and correct use of a product. It includes assistance in planning, installation, training, troubleshooting, maintenance, upgrading, and disposal of a product. Rega ...
,
text mining Text mining, text data mining (TDM) or text analytics is the process of deriving high-quality information from text. It involves "the discovery by computer of new, previously unknown information, by automatically extracting information from differe ...
,
natural language processing Natural language processing (NLP) is a subfield of computer science and especially artificial intelligence. It is primarily concerned with providing computers with the ability to process data encoded in natural language and is thus closely related ...
to allow better customer handling, agent training via interactive scripting and automatic mining using
best practices A best practice is a method or technique that has been generally accepted as superior to alternatives because it tends to produce superior results. Best practices are used to achieve quality as an alternative to mandatory standards. Best practice ...
from past interactions, support automation and many other technologies to improve agent productivity and
customer satisfaction Customer satisfaction is a term frequently used in marketing to evaluate customer experience. It is a measure of how products and services supplied by a company meet or surpass customer expectation. Customer satisfaction is defined as "the number ...
. Automatic lead selection or lead steering is also intended to improve efficiencies, both for inbound and outbound campaigns. This allows inbound calls to be directly routed to the appropriate agent for the task, whilst minimising wait times and long lists of irrelevant options for people calling in. For outbound calls, lead selection allows management to designate what type of leads go to which agent based on factors including skill,
socioeconomic Economics () is a behavioral science that studies the Production (economics), production, distribution (economics), distribution, and Consumption (economics), consumption of goods and services. Economics focuses on the behaviour and interac ...
factors, past performance, and percentage likelihood of closing a sale per lead. The universal queue standardises the processing of communications across multiple technologies such as fax, phone, and email. The
virtual queue Virtual queue is a concept used in both inbound call centers and other businesses to improve wait times for users. Call centers use an Automatic Call Distributor (ACD) to distribute incoming calls to specific resources (agents) in the center. AC ...
provides callers with an alternative to waiting on hold when no agents are available to handle inbound call demand.


Premises-based technology

Historically call centres have been built on
Private branch exchange A business telephone system is a telephone system typically used in business environments, encompassing the range of technology from the key telephone system (KTS) to the private branch exchange (PBX). A business telephone system differs from ...
(PBX) equipment owned, hosted, and maintained by the call centre operator. The PBX can provide functions such as
automatic call distribution An automated call distribution system, commonly known as automatic call distributor or automatic call dispatcher (ACD), is a telephony device that answers and distributes incoming calls to a specific group of terminals or agents within an organiz ...
,
interactive voice response Interactive voice response (IVR) is a technology that allows telephone users to interact with a computer-operated telephone system through the use of voice and DTMF tones input with a keypad. In telephony, IVR allows customers to interact with a ...
, and
skills-based routing Skills-based routing (SBR), or skills-based call routing, is a call-assignment strategy used in call centres to assign incoming calls to the most suitable agent, instead of simply choosing the next available agent. It is an enhancement to the automa ...
.


Virtual call centre

In a virtual call centre model, the call centre operator (business) pays a monthly or annual fee to a vendor that hosts the call centre telephony and data equipment in their own facility, cloud-based. In this model, the operator does not own, operate or host the equipment on which the call centre runs. Agents connect to the vendor's equipment through traditional
PSTN The public switched telephone network (PSTN) is the aggregate of the world's telephone networks that are operated by national, regional, or local telephony operators. It provides infrastructure and services for public telephony. The PSTN consists ...
telephone lines, or over
voice over IP Voice over Internet Protocol (VoIP), also known as IP telephony, is a set of technologies used primarily for voice communication sessions over Internet Protocol (IP) networks, such as the Internet. VoIP enables voice calls to be transmitted as ...
. Calls to and from prospects or contacts originate from or terminate at the vendor's data centre, rather than at the call centre operator's premises. The vendor's telephony equipment (at times data servers) then connects the calls to the call centre operator's agents. Virtual call centre technology allows people to work from home or any other location instead of in a traditional, centralised, call centre location, which increasingly allows people 'on the go' or with physical or other disabilities to work from desired locations – i.e. not leaving their house. The only required equipment is Internet access, a workstation, and a softphone. If the virtual call centre software utilizes
webRTC WebRTC (Web Real-Time Communication) is a free and open-source project providing web browsers and mobile applications with real-time communication (RTC) via application programming interfaces (APIs). It allows audio and video communication and ...
, a softphone is not required to dial. The companies are preferring Virtual Call Centre services due to cost advantage. Companies can start their call centre business immediately without installing the basic infrastructure like Dialer, ACD and IVRS. Virtual call centres became increasingly used after the
COVID-19 pandemic The COVID-19 pandemic (also known as the coronavirus pandemic and COVID pandemic), caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), began with an disease outbreak, outbreak of COVID-19 in Wuhan, China, in December ...
restricted businesses from operating with large groups of people working in close proximity.


Cloud computing

Through the use of
application programming interface An application programming interface (API) is a connection between computers or between computer programs. It is a type of software Interface (computing), interface, offering a service to other pieces of software. A document or standard that des ...
s (APIs), hosted and on-demand call centres that are built on cloud-based
software as a service Software as a service (SaaS ) is a cloud computing service model where the provider offers use of application software to a client and manages all needed physical and software resources. SaaS is usually accessed via a web application. Unlike o ...
(SaaS) platforms can integrate their functionality with cloud-based applications for
customer relationship management Customer relationship management (CRM) is a strategic process that organizations use to manage, analyze, and improve their interactions with customers. By leveraging data-driven insights, CRM helps businesses optimize communication, enhance cus ...
(CRM),
lead management Lead management is a set of methodologies, systems, and practices designed to generate new potential business clientele, generally operated through a variety of marketing campaigns or programs. Lead management facilitates a business's connection b ...
and more. It enables hosted call center software to deliver seamless, scalable, and efficient communication solutions. Developers use APIs to enhance cloud-based call centre platform functionality—including
Computer telephony integration Computer-telephony integration, also called computer–telephone integration or CTI, is a general term for technologies that coordinate interactions between telephones and a computers to be coordinated. The term is predominantly used to descri ...
(CTI) APIs which provide basic telephony controls and sophisticated call handling from a separate application, and configuration APIs which enable
graphical user interface A graphical user interface, or GUI, is a form of user interface that allows user (computing), users to human–computer interaction, interact with electronic devices through Graphics, graphical icon (computing), icons and visual indicators such ...
(GUI) controls of administrative functions.


Outsourcing

Outsourced call centres are often located in
developing countries A developing country is a sovereign state with a less-developed Secondary sector of the economy, industrial base and a lower Human Development Index (HDI) relative to developed countries. However, this definition is not universally agreed upon. ...
, where wages are significantly lower than in western countries with higher minimum wages. These include the call centre industries in the Philippines,
Bangladesh Bangladesh, officially the People's Republic of Bangladesh, is a country in South Asia. It is the List of countries and dependencies by population, eighth-most populous country in the world and among the List of countries and dependencies by ...
, and
India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...
. Companies that regularly utilise outsourced contact centre services include
British Sky Broadcasting Sky UK Limited (formerly British Sky Broadcasting Limited (BSkyB)), trading as Sky, is a British broadcaster and telecommunications company that provides television, broadband internet, fixed line and mobile telephone services to consumers a ...
and Orange in the telecommunications industry,
Adidas Adidas AG (; stylized in all lowercase since 1949) is a German athletic apparel and footwear corporation headquartered in Herzogenaurach, Bavaria, Germany. It is the largest sportswear manufacturer in Europe, and the second largest in the ...
in the sports and leisure sector,
Audi Audi AG () is a German automotive manufacturer of luxury vehicles headquartered in Ingolstadt, Bavaria, Germany. A subsidiary of the Volkswagen Group, Audi produces vehicles in nine production facilities worldwide. The origins of the compa ...
in car manufacturing and charities such as the RSPCA.


Industries


Healthcare

The
healthcare industry The healthcare industry (also called the medical industry or health economy) is an aggregation and integration of sectors within the economic system that provides goods and services to treat patients with curative, preventive, rehabilitative, ...
has and continues to use outbound call centre programmes for years to help manage billing, collections, and patient communication. The inbound call centre is a new and increasingly popular service for many types of healthcare facilities, including large hospitals. Inbound call centres can be outsourced or managed in-house. These healthcare call centres are designed to help streamline communications, enhance patient retention and satisfaction, reduce expenses and improve operational efficiencies.


Hospitality

Many large hospitality companies such as the Hilton Hotels Corporation and
Marriott International Marriott International, Inc. is an American multinational corporation, multinational company that operates, franchises, and licenses lodging brands that include hotel, residential, and timeshare properties. Marriott International owns over 37 ho ...
make use of call centres to manage reservations. These are known in the industry as "central reservations offices". Staff members at these call centres take calls from clients wishing to make reservations or other inquiries via a public number, usually a 1-800 number. These centres may operate as many as 24 hours per day, seven days a week, depending on the call volume the chain receives.


Evaluation


Mathematical theory

Queueing theory Queueing theory is the mathematical study of waiting lines, or queues. A queueing model is constructed so that queue lengths and waiting time can be predicted. Queueing theory is generally considered a branch of operations research because th ...
is a branch of mathematics in which models of service systems have been developed. A call centre can be seen as a queueing network and results from queueing theory such as the probability an arriving customer needs to wait before starting service useful for provisioning capacity. ( Erlang's C formula is such a result for an M/M/c queue and approximations exist for an M/G/k queue.) Statistical analysis of call centre data has suggested arrivals are governed by an inhomogeneous Poisson process and jobs have a log-normal service time distribution. Simulation algorithms are increasingly being used to model call arrival, queueing and service levels. Call centre operations have been supported by mathematical models beyond queueing, with
operations research Operations research () (U.S. Air Force Specialty Code: Operations Analysis), often shortened to the initialism OR, is a branch of applied mathematics that deals with the development and application of analytical methods to improve management and ...
, which considers a wide range of optimisation problems seeking to reduce waiting times while keeping server utilisation and therefore efficiency high.


Criticism

Call centres have received criticism for low rates of pay and restrictive working practices for employees, which have been deemed as a dehumanising environment. Other research illustrates how call centre workers develop ways to counter or resist this environment by integrating local cultural sensibilities or embracing a vision of a new life. Most call centres provide electronic reports that outline performance metrics, quarterly highlights and other information about the calls made and received. This has the benefit of helping the company to plan the workload and time of its employees. However, it has also been argued that such close monitoring breaches the human
right to privacy The right to privacy is an element of various legal traditions that intends to restrain governmental and private actions that threaten the privacy of individuals. Over 185 national constitutions mention the right to privacy. Since the globa ...
. Complaints are often logged by callers who find the staff do not have enough skill or authority to resolve problems, as well as appearing apathetic. These concerns are due to a business process that exhibits levels of variability because the experience a customer gets and results a company achieves on a given call are dependent upon the quality of the agent. Call centres are beginning to address this by using
agent-assisted automation Agent-assisted automation is a type of call center technology that automates elements of what the call center agent 1) does with his/her desktop tools and/or 2) says to customers during the call using pre-recorded audio. It is a relatively new ca ...
to standardise the process all agents use. However, more popular alternatives are using personality and skill based approaches. The various challenges encountered by call operators are discussed by several authors.


Media portrayals

Call centres located in
India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...
have been the focus of several documentary films, the 2004 film ''Thomas L. Friedman Reporting: The Other Side of Outsourcing'', the 2005 films ''John and Jane'', '' Nalini by Day, Nancy by Night'', and ''1-800-India: Importing a White-Collar Economy'', and the 2006 film '' Bombay Calling'', among others. An Indian call centre is also the subject of the 2006 film '' Outsourced'' and a key location in the 2008 film, ''
Slumdog Millionaire ''Slumdog Millionaire'' is a 2008 British drama film that is a loose adaptation of the novel '' Q & A'' (2005) by Indian author Vikas Swarup. It narrates the story of 18-year-old Jamal Malik from the Juhu slums of Mumbai. Starring Dev Patel ...
''. The 2014 BBC fly on the wall documentary series ''The Call Centre'' gave an often distorted although humorous view of life in a Welsh call centre.


See also

*
Automatic call distributor An automated call distribution system, commonly known as automatic call distributor or automatic call dispatcher (ACD), is a telephony device that answers and distributes incoming calls to a specific group of terminals or agents within an organiz ...
* Business process outsourcing *
Call management Call management is the process of designing and implementing inbound telephone call parameters, which govern the routing of these calls through a network. The process is most prominently utilized by corporations and the call centre industry and h ...
* List of call centre companies * Predictive dialling * Operator messaging * Queue management system * Skills based routing *
Virtual queue Virtual queue is a concept used in both inbound call centers and other businesses to improve wait times for users. Call centers use an Automatic Call Distributor (ACD) to distribute incoming calls to specific resources (agents) in the center. AC ...
* The Call Centre, a BBC fly-on-the-wall documentary at a Welsh call centre * *


References


Further reading

* Cusack M., "Online Customer Care", American Society for Quality (ASQ) Press, 2000. *
Brad Cleveland Brad Cleveland is an author, public speaker, and consultant who focuses on customer experience, call centers / contact centers, technical support centers, social media, and other customer-facing environments. He was one of two initial partners i ...
, "Call Center Management on Fast Forward", ICMI Press, 2006. * Kennedy I., ''Call centres'', School of Electrical and Information Engineering, University of the Witwatersrand, 2003. * Masi D.M.B., Fischer M.J., Harris C.M., ''Numerical Analysis of Routing Rules for Call centres'', Telecommunications Review, 1998
noblis.org


Psychosocial risk factors in call centres: An evaluation of work design and well-being. * Reena Patel, ''Working the Night Shift: Women in India's Call Center Industry'' (Stanford University Press; 2010) 219 pages; traces changing views of "women's work" in India under globalization. * Fluss, Donna, "The Real-Time Contact centre", 2005 AMACOM * Wegge, J., van Dick, R., Fisher, G., Wecking, C., & Moltzen, K. (2006, January). Work motivation, organisational identification, and well-being in call centre work. Work & Stress, 20(1), 60–83. * Legros, B. (2016). Unintended consequences of optimizing a queue discipline for a service level defined by a percentile of the waiting time. ''Operations Research Letters'', ''44''(6), 839–845. * Krishnan, C., Gupta, A., Gupta, A., Singh, G. (2022). Impact of Artificial Intelligence-Based Chatbots on Customer Engagement and Business Growth. In: Hong, TP., Serrano-Estrada, L., Saxena, A., Biswas, A. (eds) Deep Learning for Social Media Data Analytics. Studies in Big Data, vol 113. Springer, Cham. * Adam, M., Wessel, M. & Benlian, A. AI-based chatbots in customer service and their effects on user compliance. Electron Markets 31, 427–445 (2021). * Hardalov, M., Koychev, I., Nakov, P. (2018). Towards Automated Customer Support. In: Agre, G., van Genabith, J., Declerck, T. (eds) Artificial Intelligence: Methodology, Systems, and Applications. AIMSA 2018. Lecture Notes in Computer Science(), vol 11089. Springer, Cham. * Roberts, C. and Maier, T. (2024), "The evolution of service toward automated customer assistance: there is a difference", International Journal of Contemporary Hospitality Management, Vol. 36 No. 6, pp. 1914-1925. * Suendermann, D., Liscombe, J., Pieraccini, R., Evanini, K. (2010). “How am I Doing?”: A New Framework to Effectively Measure the Performance of Automated Customer Care Contact Centers. In: Neustein, A. (eds) Advances in Speech Recognition. Springer, Boston, MA.


External links

* * Mandelbaum, Avisha
Call Centers (Centres) Research Bibliography with Abstracts
. Faculty of Industrial Engineering and Management, Technion-Israel Institute of Technology. {{DEFAULTSORT:Call Centre * Computer telephony integration Telemarketing Outsourcing Telephony Customer service