[Asterisk-Users] Connection Problem - GrandStream

[Daniel Bichara]

Hi,

I am connecting two * and a GS phone. I can call Zap/g1 at *#1 from *#2 
Zap/1. It works. But when I try to call Zap/g1 at #1 from a GS (SIP) 
phone connected to #2, I get an error message at #1 that looks like * #1 
does not know which codec I use to connect my SIP phone:

Feb 21 10:36:16 NOTICE[278545]: channel.c:1448 ast_set_write_format: 
Unable to find a path from UNKN to GSM


Diagram:

This works: Zap/1 at #2 calls #1 Zap/g1
Zap/1 <--> Asterisk #2 <-------> Asterisk #1 <--> Zap/g1

Here I have a problem:
GS(SIP) <--> Asterisk #2 <------> Asterisk #1 <--> Zap/g1


Daniel