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SIP - Codecs
https://www.tutorialspoint.com/session_initiation_protocol/session_initiation_protocol_codecs.htm
G.711 is a codec that was introduced by ITU in 1972 for use in digital telephony. The codec has two variants: A-Law is being used in Europe and in international telephone links, uLawis used in the U.S.A. and Japan. 1. G.711 uses a logarithmic compression. It squeezes each 16-bit sample to 8 bits, thus it achieves a compression ratio of 1:2…
SIP Trunking For Dummies: Which Codec Should You Use ...
https://teledynamic.com/2013/05/sip-trunking-for-dummies-which-codec-should-you-use/
Common VoIP Codec Protocols. G.729 G.729 is a codec that has low bandwidth requirements but provides good audio quality. This is the most commonly used codec in VoIP calling and has a MOS rating of 4.0. G.711 G.711 is a codec that was introduced by ITU in 1972 for use in digital telephony. With only a 1:2 compression and a 64K bitrate for each ...
SIP Trunk Codecs & SDP in 3CX
https://www.3cx.com/docs/sip-trunk-codecs-sdp/
When creating the INVITE message for an outgoing call through a SIP Trunk, 3CX will place the codecs in the SDP in the exact order they have been configured in “Codec Priority” section. If the provider in the 200 OK responds with one or more codecs, 3CX will use the topmost codec found in the 200 OK. Apart from the audio codecs, 3CX will ...
AudioCodes Quick Reference Guide – Transcoding
https://www.audiocodes.com/media/13566/audiocodes-quick-reference-guide-transcoding.pdf
Transcoding is used in instances as mentioned above, when two sip endpoints do not have common coders. It can also be used when both media legs use the same coder, but have different packetization times, i.e. G.729 at 30 ms vs G.729 @ 20 ms. The coders that are added to the outbound leg are referred to as 'extension coders'.
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