Yate server > Yate bugs

iLBC negotiation

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looserouting:
when yate offers iLBC mode=20 and the remote UA anwers with mode=30 then yate must use mode=30. But it doesn't....

AFAIK iLBC mode=20 must only be used if both prefer mode=20.

marian:
Can you post the SDP offer and response?
Note that in yate mode 20 and 30 are different formats.
If yate advertise mode 20 and receives mode 30 the received format will be ignored (not enabled).

looserouting:
i can provide examples if you really need them.

I think you're right. The probem is that yate have to switch the format.
Isn't SDPMedia:update the place where this should/could be handled ?

So for now if someone wants to use iLBC with yate he must disable ilbc20 or force mode=30 through ysipchan.cfg.

marian:
ilbc20/ilbc30 offer/accept is configured in [codecs] section.
ilbc related options in [hacks] section are used when parsing received SDP.

SDPMedia::update() is the place where exiting media is updated from received SDP.
When the existing formats list is replaced with a new one, the first format is chosen
Some notes:
- If received formats list is empty (none offered or no acceptable format) the existing formats are not replaced
- If received formats list is not empty:
  - Local rtp: the format list is not updated if the intersection with offered formats leads to an empty list
  - Forward rtp: The formats list is always replaced with received formats

looserouting:
Existing media must be updated if yate offers mode20 end romote endpoint offers mode30 in SDP. So this function need to be modified to switch ilbc20 and ilbc30 in that case.

There is nothing you can do in [hacks] to make it work correctly.
There is only one option: Disable ilbc20 in [codecs]
The thing is i wanna use ilbc20 where possible.

Edit: i think since for g729 you need a license ilbc20 seems to be the best choice for a narrowband coedec. Other codecs are less common or not as good

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