check the following 

1. codecs - is asterisk doing any transcoding ? (i would set both same first)
2. RTP channels. ( the media traffic passes through this channels,
make sure your far end and asterisk box has them not obstructed by a
NAT or firewall)
3. general phone settings (usually the h323 side)


enable debug and see what is the media type. since you are already
hearing the ring, it seems to me you are ok with the H323 setup
messages and so forth.

-apu


On 8/16/05, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
> 
> Hello
> 
> we have one-way audio issue to have Asterisk and H323 work together. We have
> SER, Asterisk and H323 module installed. A sip-phone makes the call to a
> H323 gateway. The ring and voice can be heard at sip side; there is ring at
> far end, but no voice.
> 
> if you have similar issue or clues to address it, please send us a note!
> 
> thank you very much!
> steven
> 
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