[cisco-voip] g729 is used instead of iLBC

[Alex]

I'll give it a stab.
Device A/7941 and Device B/7942 share 2 common codecs: G.711 and G.729a.
Your region config as described below allows iLBC as MAX codec BW (max BW per call == 24 kbps, see http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/admin/6_0_1/ccmcfg/b02regio.html#wp1055534)
The transcoder does not get invoked between 2 IP phones in the same cluster if they share a common codec.
As to why iLBC shows in call stats, I have no idea - it should not as 7941 does not support iLBC.
Rgds
Alex
  ----- Original Message ----- 
  From: Anthony Kouloglou 
  To: Jason Burns 
  Cc: cisco-voip at puck.nether.net 
  Sent: Monday, December 01, 2008 2:53 PM
  Subject: [cisco-voip] g729 is used instead of iLBC


  Hi all,
  i really can't understand this behavior:

  Phone A (7941) is in device pool A which has region A. 
  Registered IOS Enhanced Transcoder has device pool A and is configured for iLBC.(It is physically located at site A)
  There is no media resource group or list configured in all the cluster. So all the resources are shared equally upon request i guess.

  Phone B (7942) is in device pool B  which has region B. (another siteB)
  Region A<-> Region B has iLBC configured.
  Hub_none location is configured in device_pool A.
  Location B has 80kbps configured and is lossy configured  versus hub_none.
  Location B is in device pool B

  Phone A can talk with phone B whoever calls the other.
  When A calls B or B calls A before the other answers the call, ilbc is shown in call statistics.
  When the call setup is finished and they talk, the codec on both ends is g729!!! I have nowhere configured g729 in any region!! how is this possible?
  Also, phone B calls through the voice gateway in site A and through PSTN. The codec from phone B to router is iLBC!!
  Also, phone B calls a trunk configured in site A and listens to voice-mail. The call is also iLBC!
  Voice gateway/trunk has the same settings as the phone A (that is: a device pool A and MRGL none.
  So i guess, the transcoder is working fine.

  What am i missing?
  Why can't the two phones talk in ilbc? 7941 can't use the transcoder which is in the same site?

  Thanks
  Anthony





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