Difference between revisions of "Information on Audio Codecs"

From TD-er's Wiki
Jump to navigationJump to search
Line 1: Line 1:
X-lite has various codecs implemented. From the [http://www.xten.com/docs/CounterPath_UserGuideXLite-XPRO.pdf  User’s Guide for X-Lite and X-PRO] (p.34) we learn the following:
+
X-lite has various codecs implemented. From the [http://www.xten.com/docs/CounterPath_UserGuideXLite-XPRO.pdf  User’s Guide for X-Lite and X-PRO] (p.34) the following can be said:
 
"When two VoIP systems are establishing a call, they negotiate an audio compression codec they
 
"When two VoIP systems are establishing a call, they negotiate an audio compression codec they
 
are going to use. Which audio compression codec to choose depends on many factors: which
 
are going to use. Which audio compression codec to choose depends on many factors: which
Line 5: Line 5:
 
quality, etc. During the negotiation, X-Lite/X-PRO offers to the remote system the first audio
 
quality, etc. During the negotiation, X-Lite/X-PRO offers to the remote system the first audio
 
compression codec from the list. If the remote system rejects the audio compression codec, XLite/X-PRO offers the next one from top to bottom until they both accept the audio compression
 
compression codec from the list. If the remote system rejects the audio compression codec, XLite/X-PRO offers the next one from top to bottom until they both accept the audio compression
codec.
+
codec."
  
Also there is written that the X-Lite/X-Pro versions support 6 different audio compression codecs, G.711A and G.711U being the codecs with the best sound quality but with low voice compression.  
+
Also there that the X-Lite/X-Pro versions support 6 different audio compression codecs, G.711A and G.711U being the codecs with the best sound quality but with low voice compression.  
  
 
=== G.711A & G.711U ===
 
=== G.711A & G.711U ===

Revision as of 22:14, 30 January 2007

X-lite has various codecs implemented. From the User’s Guide for X-Lite and X-PRO (p.34) the following can be said: "When two VoIP systems are establishing a call, they negotiate an audio compression codec they are going to use. Which audio compression codec to choose depends on many factors: which audio compression codecs are installed on both systems, bandwidth limitations, desired sound quality, etc. During the negotiation, X-Lite/X-PRO offers to the remote system the first audio compression codec from the list. If the remote system rejects the audio compression codec, XLite/X-PRO offers the next one from top to bottom until they both accept the audio compression codec."

Also there that the X-Lite/X-Pro versions support 6 different audio compression codecs, G.711A and G.711U being the codecs with the best sound quality but with low voice compression.

G.711A & G.711U