What Annexb yes?

What Annexb yes?

annexb: indicates that Annex B, voice activity detection, is used or preferred. Permissible values are “yes” and “no” (without the quotes); “yes” is implied if this parameter is omitted. However, a problem arises when the value of the annexa or annexb parameter does not match in the SDP [RFC4566] offer and answer.

What codec is PCMA?

G. 711 is an ITU-T standard (Recommendation) for audio companding, titled Pulse code modulation (PCM) of voice frequencies released for use in 1972.

Is g711 a ULAW?

G. 711 is an ITU-T standard algorithm for audio companding that is used for digital communication systems and supported by most of VoIP providers. G. 711 encoder creates a 64 kbit/s bitstream for a signal sampled at 8 kHz….Introducing G711 Ulaw.

Linear input code	Compressed code
s1wxyzabcdefgh…	s111wxyz

What is the best DTMF setting for G729?

If G729 is being used and the DTMF is set to use Inband it usually fails due to the compression. The rfc2833 DTMF setting is generally considered to be the most reliable.

What is the difference between G729a and g729b rtpmap descriptions?

Both G.729a and G.729b use the same rtpmap description as G.729. G.729a and G.729b are indicated using annexb=no or annexb=yes, respectively. G.729 Annex B (G.729b) is the default in absence of parameter annexb in the Session Description Protocol.

What is G729 1 G729?

G.729.1 enables scalable data rates between 8 and 32 kbps. G.729.1 is a wideband speed and audio coding algorithm, which is interoperable with G.729, G.729A and G.729B codecs. What’s the difference between G711 and G729?

How reliable is inband DTMF?

Transmission carried Inband DTMF is only considered to be reliable when the G711 (non-compressed) codec is used. If G729 is being used and the DTMF is set to use Inband it usually fails due to the compression.