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There are 2 issues here. Firstly, the timing source
you are looking for is ZTDUMMY. It's in the zaptel source but you may need to
edit the Makefile and uncomment it (remove the # from in front of ztdummy) in
order for it to be compiled and installed. Once you've got it compiled, Just
install it as a regular module in the way you would any other zaptel card
module. You need the timing source for other more important things too, like the
meetme (conference room) functionality.
Secondly, my limited (and possibly incorrect)
understanding of MOH tells me that the hold button on the phone (or softphone)
is not enough to engage MOH on it's own. The hold button generally sends a
Re-INVITE with "a=sendonly" attribute and a zero IP address for media in the SDP
message (This is from the Grandstream user manual). In other words it
deliberately establishes a broken RTP stream between the endpoints.
SOME phones (Sipura, Snom but currently NOT
grandstream) allow you to set a MOH server in their configuration. In this case,
you simply create an extension on your asterisk server that plays MOH, and set
this extension number in your phone's MOH Server parameter. I have this working
on the 2 phones that I mentioned. I don't know if it's supported on the CISCO
phone you have.
If anything I've said is wrong, would somebody
please enlighten me!
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