Re: Specifying audio codec on fixed termination

Once upon a time (almost ten years ago) I created an SDP solution for ISDN, but 
eventually backed off before it was standardized. I forgot about the need to 
specify a transport for the media in the m= line when I answered you today. 
Either we would have to carry the necessary changes through as a new AVT profile 
or you'll have to use some sort of trick.

François Plagnard wrote:
> Thank you for your answer.
> But, now my concern is how to specify an audio codec in a B channel in Local descriptor?
> I have found no way to describe it in SDP format contained in Local descriptor (there is no RTP involved here or any other transport).
> 
> Best regards,
>  
> François Plagnard
>  
> -----Message d'origine-----
> De : Tom Taylor [mailto:[email protected]] 
> Envoyé : vendredi 4 décembre 2009 17:23
> À : François Plagnard
> Cc : [email protected]
> Objet : Re: [Megaco] Specifying audio codec on fixed termination
> 
> It is legitimate to specify a Local Descriptor for the B channel termination, 
> indicating which codec is being used.
> 
> François Plagnard wrote:
>> Hello,
>>
>>  
>>
>> In a gateway between ISDN and IP, B channels on ISDN side are fixed terminations.
>>
>> In some ISDN networks, the audio codec used line may vary per call (often between G.711 A law and mu law).
>>
>> How this audio codec may be indicated by the MGC to the gateway?
>>
>>  
>>
>> Best regards,
>>
>>  
>>
>> François Plagnard
>>
>>  
>>
>>
>>
>>
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>>
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> 
>