[asterisk-dev] Early Media on H.323 problem

[Kevin P. Fleming]

Kyle Bresin wrote:

> I'm still perplexed why the codec "slin" is even being mentioned.  AFAIK 
> nothing involved is using it...

Yes it is. The H.323 channel is telling Asterisk that the call is 
'ringing', but for some reason Asterisk does not know how to send 
out-of-band ringing to the originating channel. Since that is the case, 
it has to generate inband ringing, which it can't do because it can't 
transcode into the channel's format.

You need to find out the originating channel won't accept out-of-band 
indications.