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G.711 - Wikipedia
https://en.wikipedia.org/wiki/G.711
G.711 is a narrowband audio codec originally designed for use in telephony that provides toll-quality audio at 64 kbit/s. G.711 passes audio signals in the range of 300–3400 Hz and samples them at the rate of 8,000 samples per second, with the …
RFC 5391 - RTP Payload Format for ITU-T …
https://tools.ietf.org/html/rfc5391
This is consistent with the audio/PCMA and audio/PCMU media types separation for G.711 audio. The parameters are defined here as part of the media subtype registrations for the G.711.1 codec. A mapping of the parameters into the Session Description Protocol (SDP) is also provided for those applications that use SDP. In control protocols that do ...
G711.org - Telephony File Converter
G711 File Converter. This free tool will convert just about any DRM-free media file into audio that's compatible with most telephony vendors' Music on Hold and IVR Announcements. Source File. Browse. Note: 50MB Maximum File Size. Output Format. u-law WAV (8Khz, Mono, u-law) a-law WAV (8Khz, Mono, a-law) Standard Definition WAV (8Khz, Mono, 16 ...
Solved: SIP/SDP - no codec specifed - Cisco Community
https://community.cisco.com/t5/ip-telephony-and-phones/sip-sdp-no-codec-specifed/td-p/3913990
08-26-2019 08:55 PM. The numbers at the end of this m line: m=audio 23610 RTP/AVP 8 0 18 97. Those are the codecs. They are RTP payload types, and in preference order. Eg 8=g711alaw, 0=g711ulaw, 18=g729, 97=this one is special, it's actually what they want to Mark RTP-NTP (RFC2833) DTMF relay as.
Understanding Session Description Protocol (SDP) | Tao ...
https://andrewjprokop.wordpress.com/2013/09/30/understanding-session-description-protocol-sdp/
It can support three audio codecs and one video codec. The audio codecs are G.711 uLaw (PCMU), G.711 aLaw (PCMA), and iLBC. The audio codecs will use port 49170 and all have a sample rate of 8000 Hz. The video codec is H.261 on port 51327. 99.9% of the time I can safely ignore any of the other SDP values that might be present.
The Session Description Protocol (SDP) - 3CX
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 ...
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