asterisk users - Feb 2004 - Connection Problem - GrandStream

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

|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:

It does look like codec problem. GS only has g729, ulaw and alaw, 
others. * only do gsm, alaw and ulaw, others. So you have to set your GS 
to do ulaw and set your codec accordingly in your sip.conf as well.

-- 
David Kwok

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