Intercom from same extension not working

[lyndenwld (lynden waldner)]

I am wondering if this is just how it is or if I am overlooking something

PBX Version:16.0.40.7
PBX Distro:12.7.8-2302-1.sng7
Asterisk Version:18.9

I have clients with 4 voip phones that have the same extension assigned to them.
lets say the extension is 500

They want to be able to intercom by dialing *80500 from one of the four phones and have the other 3 phones auto answer the intercom call.

The issue that I am having with the setup is if i try this from one of the 4 phones with the same extension I get a message “intercom for extension 500 is disables” even though it is enabled.

If I try the same thing from a phone on a different extension it works just like it should (all 4 phones auto answer the intercom call)

So why does it not work from one of the four phones with same extension?

[dicko]

Because when you answer a call, the extension 500 is ‘bound’ to the ip address of that phone, SIP would only send that new call back to you with negative effect,

[lyndenwld (lynden waldner)]

So why has it worked in the past and now it doesn’t.

[dicko]

Sorry, never tried to ‘intercom’ myself but perhaps someone figured out that that;s not a good idea.

[david55]

I think this is happening because of FreePBX logic, not because of binding of an IP address. Even if this done using chan_pjsip multiple contacts, addresses are only bound to the contact, and that is at registration time, not call set up time. If it just done with & in the dial string, the Asterisk core has no idea that multiple endpoints correspond to the same Asterisk extension