[cisco-voip] FXS to VoIP

[Ryan Ratliff]

What protocol is the FXS port using to talk to CUCM? If it is H.323  
then there will be a voip dial-peer (sounds like this is the case) and  
you should use a codec class that allows for g.711 and g.729 (not g. 
729b though).  Other than that it is the region configuration between  
the FXS port (or the h.323 gw in this case) and the IP phone that  
determines the codec used among the capabilities each device  
communicates to CUCM.

-Ryan

On Oct 16, 2009, at 7:14 PM, Ratko Dodevski wrote:

Hi, does anyone knows how can I somehow fix a codec on a FXS port or  
make it use transcoder or something like that??? I have problem where  
when I dial from IP calls are ok but when I use analogue phone on FXS  
port it's the same dial peer same negotiated codec (g711) but when i  
hit show voice call status it says that codec in use is g729r8. If I  
set this codec on the dial peer the call is rejected. I've tried with  
voice class codec, but it's the same. only thing I can think of is  
transcoder but i don't know how to make a FXS to bring up the  
transcoder.

Regards
Ratko

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