Issue with GSM codec on the T46G

[esamuels]

(11-01-2014 01:37 PM)Yealink_Wilson Wrote:  Hi Errol,

I am sorry to tell you Yealink T46 phone would not support the GSM codec any more in the V73 version.
For your doubt, during the SDP negotiation, the initiator give some types of support codec , and in which the recipient to choose their own kind, and then complete the interaction. Followed by the establishment of the RTP stream. So if you set the other sides don't have same codec in the codec list and your pbx server does not support the transfer function of the codec, they can't establish call with each other.

So please enabled the same codec on other sides then try again.
For example, Calling between the Yealink T46G (with G722, PCMU,PCMA enabled) and Zoiper / CSIPSimple (G722, PCMU,PCMA enabled) to confirm whether there is audio issue?

Hello Yealink_Wilson,

I think you misread or misunderstood my original post where I did also mentioned that I also tested Calling between the Yealink T46G (with only GSM enabled) and Zoiper / CSIPSimple (with only GSM enabled) there is no audio.

There is no issue when we use G722,PCMU,PCMA on both ends or even if the other end has GSM enabled and the T46G only has G722, PCMU,PCMA enabled because Freeswitch will do the transcoding.

Quote:BTW, may I know why do you need to test the GSM codec with Yealink phone?
thanks

The GSM codec is actually listed as one of the codecs in the T46 (Firmware 28.72.0.45) and it was in my enabled list so when ever a call came from a softphone that offered GSM both devices negotiated GSM but then I got no audio between the T46G and the softphone which lead me to believe there was a problem with GSM on the T46G.

So I merely wanted to confirm whether the GSM codec issue is a known issue so that we wouldn't enable it in the future.

Thanks

Errol