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Cisco Unified Border Element Configuration Guide Through ...
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/voice/cube/configuration/cube-book/voi-sip-param-mod.html
Device(config)# voice class sip-profiles 10 Device(config-class)# rule 2 request any sdp-header Audio-Attribute modify "a=recvonly" "a=sendrecv" Device(config-class)# end Example: Removing "a=ixmap" in M-Line number 4 of the INVITE SDP Request Messages
SIP - Session Description Protocol - Tutorialspoint
https://www.tutorialspoint.com/session_initiation_protocol/session_initiation_protocol_sdp.htm
Attributes in SDP can be either. session level, or; media level. Session level means that the attribute is listed before the first media line in the SDP. If this is the case, the attribute applies to all the media lines below it. Media level means it is listed after a media line. In this case, the attribute only applies to this particular media ...
I need to remove the "a=crypto:" part from my SDP header ...
https://community.cisco.com/t5/other-security-subjects/i-need-to-remove-the-quot-a-crypto-quot-part-from-my-sdp-header/td-p/4172970
request ANY sdp-header Audio-Attribute modify "(a=crypto:.*inline:[A-Za-z0-9+/=]+)" "" Then it removes the a=crypto but leaves to blank spaces between a=fmtp and a=sendrecv (I just filled it in with the words blank spaces but in the debug it is 2 blank spaces then the a=sendrecv part)
SDP – Session Description Protocol – Overview – Nick vs ...
https://nickvsnetworking.com/sdp-session-description-protocol-overview/
SDP is designed to be lightweight, while SIP uses human readable headers like To and From, SDP does away with this in favour of single letters representing what that header contains. As an interesting aside, SIP at one stage also offered one-letter headers to make it smaller on the wire, but this never really took off.
The Session Description Protocol (SDP)
https://www.3cx.com/blog/voip-howto/sdp-voip2/
The Session Description Protocol (SDP)-VoIP Part 2. When a SIP based VoIP call is established, the audio or video sent between two SIP entities or more is streamed. Since many different codecs are supported by different devices or software, and each individual SIP entity taking part in the call does not know the IP address of the other SIP ...
Session Description Protocol (SDP) Parameters
https://www.iana.org/assignments/sdp-parameters
attribute-name (formerly "att-field") content SDP Parameters. Semantics for the "group" SDP Attribute. "rtcp-fb" Attribute Values. "ack" and "nack" Attribute Values. "depend" SDP Attribute Values. "cs-correlation" Attribute Values. Semantics for the "ssrc-group" SDP Attribute. SDP/RTSP key management protocol identifiers.
Understanding Session Description Protocol (SDP) | Tao ...
https://andrewjprokop.wordpress.com/2013/09/30/understanding-session-description-protocol-sdp/
a= There will be an attribute line for each codec advertised in the media line. Looking at the example above I immediately see this. The client will use IP version 4 with an address of 10.120.42.3. It can support three audio codecs and one video codec. The audio codecs are G.711 uLaw (PCMU), G.711 aLaw (PCMA), and iLBC.
RFC 4566 - SDP: Session Description Protocol
https://tools.ietf.org/html/rfc4566
RFC 4566 SDP July 2006 1.Introduction When initiating multimedia teleconferences, voice-over-IP calls, streaming video, or other sessions, there is a requirement to convey media details, transport addresses, and other session description metadata to the participants. SDP provides a standard representation for such information, irrespective of how that information is transported.
RFC 3556 - Session Description Protocol (SDP) Bandwidth ...
https://tools.ietf.org/html/rfc3556
RFC 3556 SDP Bandwidth Modifiers for RTCP Bandwidth July 2003 3.Default values If either or both of the RS and RR bandwidth specifiers are omitted, the default values for these parameters are as specified in the RTP profile in use for the session in question. For the Audio/Video Profile, RFC 3551 [], the defaults follow the recommendations of the RTP spec: o The total RTCP …
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