[asterisk-dev] Wish: adding intelligent codec negotiation to asterisk / pjsip

[Michael Maier]

On 01/31/2017 at 05:15 PM Joshua Colp wrote:
> On Tue, Jan 31, 2017, at 12:01 PM, Michael Maier wrote:

[...]

>>> We
>>> don't pass the information to the other side, we just adjust our formats
>>> and transcoding.
>>
>> Yes. That's not necessary. But it is necessary, that asterisk is able to
>> identify
>> - that transcoding between two UAs is currently active.
>> - the codec used by the peer UA stream and if this codec is allowed (by
>> configuration) for the other UA, too. If yes: send other UA a reinvite
>> to ensure both UAs are using the same codec as from now and switch off
>> transcoding and all other related stuff, which isn't need any more.
> 
> It's not currently possible to know from a configuration perspective.
> The bridging core can know what has been currently negotiated on each
> side only. There is no mechanism to reach across and get the
> configuration information.

I'm beginning to understand how asterisk works today and why it is not
as easy as I thought.
But the planned stream support for 15 fills this gap, which is necessary
to provide a feature to prevent transcoding if a common codec between
two legs exists.

Therefore I would be happy if this feature would be provided w/ 15
instead of adding a lot of time and effort to achieve it by special
adjusts / expansions of the actual code.



Thanks,
Michael