[Asterisk-Dev] Bridge failed on channels

[Kevin P. Fleming]

phu at bevertec.com wrote:

> When I use 2 heterogeneous phones to talk, Asterisk log report the
> following problem. I know it is not because asterisk, but I really need
> your hints and helps. Thank you very much!

This is not a -dev question, please take future questions like this to 
the -users list.

> Mar 16 12:09:48 NOTICE[23922]: channel.c:1724 ast_set_read_format: Unable
> to find a path from g723 to ulaw
> Mar 16 12:09:48 NOTICE[23922]: channel.c:1691 ast_set_write_format: Unable
> to find a path from ulaw to g723

You have one phone configured for ulaw, and one for G.723. Asterisk 
cannot transcode between them, so they cannot talk to each other.