I am a bit confused on the Codecs to use when trying to save bandwidth (locally G 711 works fine).
I am using Yealink T 28 that has the following codecs.
PCMU (G 711u as far as I know)
PCMA (G 711a)
G722 (wideband, so it will not be suitable)
In Operator says that the 723 and 729 are only for pass though so won't they be suitable?
Does this leave me with G726? Which of the G726 is the one that Operator supports?
There are other codecs on operator but not supported on the phones such as Speedx, iLBC and GSM.
Other thing. Is there any way to know which codec is being used in a call?
[Updated on: Thu, 24 November 2011 14:17]
Home & Office
Kerio Prefered Partner
- Vladimir Toncar (Kerio)
G.726 is supported in its 32 kbps variant.
"Pass through" means that Operator does not decode/encode the audio stream, so you can use the codec for a call to a party that understands the codec (like some SIP carriers). You cannot use the codec for calls that terminate on Operator (like conferences, call queues, voicemail, etc.).
The GUI does not show the codecs used. You can either go to the console and find out using asterisk's console program (asterisk -vvvvr) or record the call using the packet sniffer and then inspect the communication using Wireshark.
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