- Silver, 250 points or more
CUCM version 7.01
2811 MGCP gateway version 12.4(24)T
phone 7962 7942
I am having an issue where want to use ilbc on the call leg from the PRI gateway to the ip phone.
When we dial ip phone to ip phone the call is set to use ilbc and we can see that the phone is successfully negotiating that codec and everything works fine.
When we dial the the DID, the call comes into the MGCP gateway but it seems that the phone and the gateway can not negotiate ilbc. We do have a transcoder on the gateway that is registered and in the MRGL of the gateway but we still can not use ilbc. We also have the regions set so that between the gateway and the ip phone ilbc will be the preferred codec.
A test that we conducted is that we called meeting place, which only supports 711 from our ip phone using ilbc and we can see that the transcoder does get used and there is no problems there. Its just when we want the call to come from the mgcp gateway to the iphone using ilbc that we run into this issue.