Welcome to the painful world of analog phone lines. Unless
you are using a digital line, there really is no true call progress detection
available. In many situations this is not a problem, where we see this the most
is when you are trying to ring a zip device and a zap channel at the same time,
the zap call progress indicates an answered line the moment the zap channel goes
active, NOT when the far side answers. If you have a ring group with sip and zap
channels, what typically happens is that the sip phone will ring once, but as
soon as the TDM card places the outbound call, it is considered "answered" and
the sip phone stops ringing. Yes, you can enable callprogress and several other
tweaks but the end result is often the far side answering and Asterisk still
playing ring tones because there is no signal on the PSTN to indicate a far side
answer.
So, what to do when you find yourself in this situation and
adding a PRI is not a solution, the only way we have worked around this is to
make those outbound calls over a SIP or IAX service provider (and no, using a
SIP gateway like a Mediatrix 1204 does not solve the problem as it is a PSTN
issue)
I know some people will argue this, but this was the result
of almost 12 hours of work with us and Digium to figure out this issue. After
MUCH debate and many hours of testing, this became the official
word.
Don't shoot the messenger.
Kerry
Garrison Director of Technical Services Tech Data Pros - (949) 502-7819 x200 - [EMAIL PROTECTED] http://www.techdatapros.com
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