asterisk users - Apr 2003 - Problems with apps (ie Voicemail, Meetme, etc) and SIP,g723

I am having problems tying to use Voicemail and MeetMe or terminate calls with 
X100Ps using SIP and g723.

I am in an environment where most users have only narrow band (at most 64K) and
therefore I am trying to use either GSM or g723. I have tried placing calls
between two SIP endpoints with Xten and in g723 the quality is very good.
However, with GSM the suffers greatly (it seems others have found the same). Now
the problem is that from Xten and using g723 none of the apps I mentioned above
work whatsoever. (I get from channel.c: Unable to find a path from 2 to 1)

Shoud these apps work with g723?

Also, is there a way to config sip.conf so that users can use different codecs?
I have tried allow=.... on per user basis but it didn?t seem to work.

Any help would be greatly appreciated

Dan
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