[Asterisk-Users] Zap - 256 format frames

[Eric Wieling]

Matthew Boehm wrote:

> Well, it seems that Zap cannot do 729 at all:
> 
> channels/chan_zap.c (line 4156):
> 
> if ((frame->subclass != AST_FORMAT_SLINEAR) &&
>             (frame->subclass != AST_FORMAT_ULAW) &&
>             (frame->subclass != AST_FORMAT_ALAW)) {
>     ast_log(LOG_WARNING, "Cannot handle frames in %d format\n",
> frame->subclass);
>     return -1;
> }
> 
> Seems that Zap can only do slinear, ulaw and alaw. So, how do I force my zap
> card to only to alaw?
> 
> If I have an incomming Sip 729 call, shouldn't asterisk convert it to 711 to
> go out the zap card? I have 10 g729 licenses.

Correct.  Zap can only do slinear, ulaw, and alaw.  Asterisk will 
transcode from whatever codec you are using for the VoIP leg of the 
call into ulaw or alaw.  Since you have G729 licenses this should 
happen automagically.  I have no idea why this is happening.