Voice over Internet Protocol (Voice over IP, VoIP) is a general term for a family of methodologies, communication protocols, and transmission technologies for delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms frequently encountered and often used synonymously with VoIP are IP telephony, Internet telephony, voice over broadband (VoBB), broadband telephony, and broadband phone.

Internet telephony refers to communications services — voice, fax, SMS, and/or voice-messaging applications — that are transported via the Internet, rather than the public switched telephone network (PSTN). The steps involved in originating an VoIP telephone call are signaling and media channel setup, digitization of the analog voice signal, optionally compression, packetization, and transmission as Internet Protocol (IP) packets over a packet-switched network. On the receiving side similar steps reproduce the original voice stream.

VoIP systems employ session control protocols to control the set-up and tear-down of calls as well as audio codecs which encode speech allowing transmission over an IP network as digital audio via an audio stream. Codec use is varied between different implementations of VoIP (and often a range of codecs are used); some implementations rely on narrowband and compressed speech, while others support high fidelity stereo codecs.

Legacy Systems

CSE migrated from its legacy Telephony Office-LinX 2000 system to the UBIT Voice over Internet Protocol (VoIP) system on Thursday, September 10, 2009.


  1. General VoIP problems: cit-helpdesk@buffalo.edu, (716) 645-3542.
  2. VoIP password reset requests: cit-helpdesk@buffalo.edu.
  3. VoIP feedback: voip-feedback@buffalo.edu.
  4. VoIP Project Manager: Barbara Vasbinder, (716) 645-5075.


  1. http://en.wikipedia.org/wiki/Voice_over_Internet_Protocol
  2. http://www.buffalo.edu/ubit/service-guides/phones/telephone-services-for...
  3. http://www.buffalo.edu/ubit/service-guides/phones/telephone-services-for...
  4. http://www.buffalo.edu/ub2020/itst/voip.html
  5. http://www.buffalo.edu/ub2020/itst/voip_imple_order.html
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