asterisk users - May 2004 - Failover: iconnecthere to voicepulse

Hi all,

I'm working on a setup for a small office.  I'd like to use
SIP/iconnecthere
most of the time, because they're cheap.  But they only allow a single call.
When the single iconnecthere line is in use, I'd like to use IAX2/voicepulse
instead:

exten => _1NXXNXXXXXX,1,Dial,SIP/BYEXTENSION@iconnect
exten => _1NXXNXXXXXX,2,Dial,IAX2/npI42VoD38@voicepulse/${EXTEN}

Well, it's not working because iconnecthere actually picks up the second
call
and plays a message.  So nothing ever gets to line 2 above.  I got quite
excited when I saw the sip.conf option:

outgoinglimit=1

Which one might expect would prevent 2 concurrent calls on iconnect.  But that
doesn't seem to have any effect.

So I've been wondering if there is another way.  I guess I could spawn a
system command that goes and looks at the current SIP connections.  But that
seems a bit desperate, not to mention prone to race conditions.

Any ideas?

Thanks.
--
James Bowman
http://acelere.net

> I'm working on a setup for a small office.  I'd like to use
SIP/iconnecthere
> most of the time, because they're cheap.  But they only allow a single
call.
> When the single iconnecthere line is in use, I'd like to use
IAX2/voicepulse
> instead:
> 
> exten => _1NXXNXXXXXX,1,Dial,SIP/BYEXTENSION@iconnect
> exten => _1NXXNXXXXXX,2,Dial,IAX2/npI42VoD38@voicepulse/${EXTEN}
> 
> Well, it's not working because iconnecthere actually picks up the
second call
> and plays a message.  So nothing ever gets to line 2 above.  I got quite
> excited when I saw the sip.conf option:
> 
> outgoinglimit=1
> 
> Which one might expect would prevent 2 concurrent calls on iconnect.  But
that
> doesn't seem to have any effect.
> 
> So I've been wondering if there is another way.  I guess I could spawn
a
> system command that goes and looks at the current SIP connections.  But
that
> seems a bit desperate, not to mention prone to race conditions.
> 
> Any ideas?
Might check 'show application ChanIsAvail'. I don't have a need for
it, so
don't know if it applies to sip channels for sure. Best guess is combining
outgoinglimit with ChanIsAvail and test it.

Second guess is the construction of the dialplan as shown above. 
If 1,Dial,SIP incurres a busy, what happens?