Most efficient way to Dial a late-SIP joiner in the dialplan

Asterisk Asterisk Dialplan
1

Hi all,

I was looking for the most efficient way to Dial late-registering SIP endpoints on the PJSIP channel.

I was assuming to use RetryDial for this, however this has following problems:

  • It does not start calling when no PJSIP destination endpoint is registered at the moment the call starts.
  • The PJSIP_DIAL_CONTACTS application only returns the list of currently registered devices. Devices that join 2-5 sec later are hence not being called

exten => phone,n,RetryDial(priv-trying, 1, 45, ${PJSIP_DIAL_CONTACTS(${EXTEN})})

How can I achieve that Asterisk keeps trying to dial all PJSIP AoR’s, even those who REGISTER af few seconds later ?

Thanks in advance for the insights/hints.

2

You can’t. At the point the call is already in progress and you can’t add new contacts to it.

3

You’d have to do what Queue does (or use Queue) and timeout and abandon the call, then re-ring with an updated list. I’m not sure if Queue flags the cancel as not being a missed call, but I imagine doing it with Dial will generate missed calls on those which were early arrivers but went unanswered.

4

Thanks for the answers.
I will have a look what I can do with queues, however what I want to avoid is that (mobile) phones that start ringing suddenly stop (due to SIP CANCEL) and restart again after a while.

And additional problem is that the number of AoR’s that register with the SIP account is dynamic, depending on the phone’s reachability.

So at one time PJSIP_DIAL_CONTACTS might contain only one endpoint, but later that day it might contain up to 10 destinations.

5

What others do is use a Local channel specifically for dialing a mobile device, that waits a fixed amount of time or has logic via an outside source that awaits registration of an endpoint. Having separate AORs/endpoints helps with that.

6

Thanks everyone.

I’ve created a separate local channel for the mobile devices that polls for incoming devices.
Wired devices get called immediately in the other local channel.

7

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