[Asterisk-Users] REINVITE and Codecs

[Rich Adamson]

> just a question:
> 
> Let say I have 2 phones with G729 onboard, but no 729 licence for Asterisk.
> 
> Preferred codec set up in phones is G729, followed by ULAW, in
> Asterisk I have allow=ULAW deny=ALL.
> 
> When call is reinvited by Asterisk will the two phones use G729
> between each other or they will stick to ULAW they used for first part
> of the call ?
> 
> A quick test showed that they will use ULAW ... can I work around this
> or am I getting something wrong ?

Only the phone's firmware developer will know for sure. There is no way
to know what logic they may have included in the phone. Some phones
allow you to specify a default/preferred codec while others don't even
mention it.