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RTP payload formats - Wikipedia
https://en.wikipedia.org/wiki/RTP_payload_formats#:~:text=Audio%20and%20video%20payload%20types%20%20%20,%20RFC%203551%20%2020%20more%20rows%20
SDP Codec Selection and QoS Signaling - EventHelix.com
https://www.eventhelix.com/ims/sdp/sdp_codec_selection_resource_allocation.pdf
codec values in SDP - Cisco Community
https://community.cisco.com/t5/ip-telephony-and-phones/codec-values-in-sdp/td-p/3035212
codec values in SDP Is there a site of IETF or ITU where rtpmap values in SDP for all audio codecs are listed? I saw many sites of both organizations with examples in rtpmap, but those were not a complete list.
The Session Description Protocol (SDP)
https://www.3cx.com/blog/voip-howto/sdp-voip2/
SIP phone A has the following codec priority; 1: PCMU, 2: PCMA, 3: GSM; SIP phone B has the following codec priority; 1: Speex, 2: G729, 3: PCMA; In such scenario, PCMA will be the codec chosen from the SIP phones to be used for encoding and decoding streamed media, as it is the first matched codec between the 2 SIP phones.
Audio Backchannel codec selection
https://doc.milestonesys.com/latest/en-us/onvifdriver/audio_backchannel_codec_selection.htm
Based on this SDP the ONVIF driver will select the needed codec, encode the audio stream, and send the RTP audio packets with the payload type of the codec. For example, if the user has selected “G726, 32kbps, 8kHz”, the ONVIF driver will encode the audio using the G.726 codec in 32 kbps and set the payload type of the RTP packets sent to 99.
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