Need help intercepting incoming calls in FreePBX for Zoiper Android SDK push proxy

FreePBX Endpoints
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Need help intercepting incoming calls in FreePBX for Zoiper Android SDK push proxy

Hello,

I’m implementing a softphone feature inside my own Android application using the Zoiper Android SDK.
I’m not using the Zoiper softphone app itself — I’m only integrating their SDK inside my custom app.

For incoming calls to work reliably on mobile without keeping a constant SIP registration (to save battery), I want to implement push notifications similar to Zoiper’s Push Proxy flow:

  1. Intercept the incoming SIP INVITE on the PBX.
  2. Trigger my push notification service (using Zoiper SDK methods on the app side).
  3. Wait for the mobile client to wake up and register.
  4. Deliver the call once registration is complete.

My current challenge is step 1 — intercepting incoming calls in FreePBX.

I want to:

  • Catch all calls for certain extensions (initially for testing, e.g., extension 1114).
  • Log them in /var/log/asterisk/full to confirm interception works.
  • Later, replace the log step with an HTTP POST to my push server.

Test Dialplan Attempt

I tried creating a custom context in /etc/asterisk/extensions_custom.conf:

[from-push-test-1114]
exten => 1114,1,NoOp(*** PUSH PROXY TEST - Call to 1114 from ${CALLERID(num)} ***)
 same => n,Verbose(1,*** Interception worked for EXTEN=1114 ***)
 same => n,Wait(1)
 same => n,Dial(PJSIP/1114,30)   ; Ring extension for 30 sec
 same => n,Hangup()
Then I attempted to route calls to this context via Custom Destinations, but the call often disconnects after 1 second.

**Questions**
* What’s the best FreePBX-friendly way to hook into the dialplan for a specific extension (and later all extensions) without breaking call flow?

* Should I override contexts in extensions_override_freepbx.conf or use a -custom context in extensions_custom.conf?

* Is there a standard or recommended approach to insert interception before the extension is rung?

* Any examples of how others have implemented push proxy or similar logic with FreePBX + PJSIP?

System details:

* 1. FreePBX
* 2. Using PJSIP extensions
* 3. Zoiper Android SDK (not the app)

Any advice, working examples, or documentation references would be greatly appreciated.

Thanks,