Still trying to figure out the optimum arrangement so I don't have an inordinate number of extensions. Maybe like this:
1. First outgoing try 2. Second outgoing try 3. Third ougoing try 4. Play a message and/or hangup
102. Goto 2 203. Goto 3 304. Goto 4
But this is not to say _you_ can't built a reliable VOIP based system. Get _two_ providers and set up your dial plan in extensions.conf to "fail over" if one service fails to connect to dial via the next one and finally if both fail use pstn. your users will see a system the "just works".
Now there's an idea. I'm playing with this now, but there's at least 1 case I'm having trouble recognizing:
The call connects but then drops due to "unauthorized." It then only goes to the "h" extension and I don't get a chance to try again. Is there anyway to detect this?
I have to cover all of the following cases:
1. VOIP IP address is not reachable. Goes to extension n+101 (seems to work as expected)
2. VOIP service answers but refuses with call with "unauthorized". It just goes to the "h" extension Is there any watch to catch this failure? Perhaps put a timer on it and say if the call was less than 5 seconds or something try the next one?
Yes I am using a correct username and password and getting this today (not from Voicepulse, from another provider). But there's also a moderate chance that during our systems' setup a name or password could be misspelled so I need to cover this case.
3. VOIP service connects but reports "all busy." Well this one is hard to test. But I can make the Zap channel busy. It goes to extension n+101 as expected, so I'll have to assume that a busy VOIP service does the same thing.
I was trying to determine if the "t" or "h" extension would be useful for these but I think not. The timeout has to be set long enough for someone to actually answer (20-60 sec or whatever). The "h" is always visited at the end of the call, whether it was sucessful or not.
Any other cases, or suggestions how to handle case #2?
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