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https://en.wikipedia.org/wiki/H.261
H.261 is an ITU-T video compression standard, first ratified in November 1988. It is the first member of the H.26x family of video coding standards in the domain of the ITU-T Video Coding Experts Group (VCEG, then Specialists Group on Coding for Visual Telephony), and was developed with a number of companies, including Hitachi, PictureTel, NTT, BT and Toshiba.Organization: ITU-T, Hitachi, PictureTel, NTT, BT, …
https://tools.ietf.org/html/draft-even-avt-h263-h261-options-00
These codec specific parameters can be used with SIP[1], SAP[2] or any similar protocol that uses SDP to signal support of those codecs. 2. H.261 Codec Parameters For further description of these H.261 parameters refer to the ITU H.261 document[3]. The fmtp parameters for H.261 …Author: Petri Koskelainen, Roni Even
https://en.wikipedia.org/wiki/H.263
H.263v2 (also known as H.263+, or as the 1998 version of H.263) is the informal name of the second edition of the ITU-T H.263 international video coding standard. It retained the entire technical content of the original version of the standard, but enhanced H.263 capabilities by adding several annexes which can substantially improve encoding ...Organization: ITU-T
http://www.alldeaf.com/threads/which-is-best-media-server-streaming-h-264-or-h-323.29235/
Jun 03, 2006 · Which is best Media Server Streaming: H.264 or H.323? Thread starter xentra; Start date Jun 3, 2006; xentra ... Up to 30 fps H.263 video performance H.323 or SIP compliant Ethernet G.723.1 and G.711 audio support ... The spec shown in the blog says H.261 or H.263 I think it is for backward compatibility with other videophone users beside VP-100 ...
https://support.zoom.us/hc/en-us/categories/200110033-H-323-SIP
Getting Started With H.323/SIP Room Connector; H.323/SIP Room Connector Dial Strings; H.323/SIP Menu; Zoom Connector for Polycom; Zoom Connector for Cisco; Zoom Connector for Lifesize; See all 12 articles Frequently Asked Questions. Start a Meeting from an H.323/SIP Endpoint; How Do I Enable H.239 or BFCP? Video Layout for H.323/SIP
https://www.cisco.com/c/en/us/td/docs/routers/asr1000/configuration/guide/sbcu/2_xe/sbcu_2_xe_book/sbc_h32.pdf
Chapter 33 H.323 Support H.323 Features † H.323 to SIP Interworking—Interworking of a defined subset of SIP/H.323 call and media signaling. See the H.323 to SIP Interworking chapter in this configuration guide. † Basic conferencing passthrough (this feature is part of Q.931/H.225 passthrough)—Pass through of conferenceID and conferenceGoal.
https://social.technet.microsoft.com/Forums/lync/en-US/546c4352-bdc4-4fdc-a01f-7063c5c09d4c/hdx-endpoint-sip-409-conflict
Aug 10, 2011 · What codec do you see in the SDP during media negiation? Can you tell if video is attempting to establish via RTV, H.263 or H.261 during HDX<>Lync calls? If you see H.261 make sure that "Basic Mode" is not enabled (this option was renamed to "Diagnostic Mode" in 3.0.2) under the Call Preferences. Lync does not support H.261.
https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucme/admin/configuration/manual/cmeadm/cmevideo.html
Prerequisites for Video Support H.323 or SIP network for voice calls is operational. ... H.261—Cisco Unified CME 4.0 and later versions ... This feature does not support the following: ...
https://searchunifiedcommunications.techtarget.com/feature/SIP-video-conferencing-systems-A-standardized-approach-to-integration
Mar 12, 2011 · SIP video conferencing systems: A standardized approach to integration by Katherine Trost, Research Analyst, Nemertes Research. The role of SIP is straightforward: It enables endpoints to find one another, establish a session and terminate the session once communication is complete. As defined in IETF Request for Comments (RFC) 3261, SIP provides a common signaling language for …
http://www.cs.columbia.edu/~hgs/papers/others/1999/Dalg9909_Comparison.pdf
Two standards compete for IP Telephony signaling. The older and currently more widely accepted standard is the ITU-T recommendation H.3232, which defines a multimedia communications system over packet-switched networks, including IP networks. The other standard, Session Initiation Protocol (SIP)3, comes from the IETF MMUSIC working group.
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