I am trying to setup Bellcommander at our School. We have a Grandstream Model UCM6510 V1.4B. The bells are working fine. I wanted to setup Emergency Bells and to do that I had to register a SIP Extension in Bellcommander. That seemed to work fine.
Right now we only have a license for 1 Extension to call into Bellcommander. The problem is that Bellcommander looks at the Contact Header. Every time I hit the button on the phone to call the Bellcommander Emergency Extension, it has a different Contact Header.
i.e. I have it set so that extension 4200 is the extension allowed to call bellcommander. The SIP extension used for emergency is 8100 and I have it registered in Bellcommander. If I dial 8100 from extension 4200 and look at the Bellcommander logs.
The first time it may have:
Contact: <sip:4a8c3333-6c41-4403-ae29-41e408fdcbfd AT 192.168.20.1:5060>
The next time it may have:
Contact: <sip:A0397F34-EB0A-4573-9521-ED28JA5A0184 AT 192.168.20.1:5060>
The FROM header will show the correct extension in it:
From: “Tech” <sip:4200 AT 192.168.20.1>;tag=f50fb80c-013d-41eb-a40b-04964dhf2cb8
Is there a setting somewhere to tell Grandstream to use the Extension in the Contact header instead of some random number?
Thanks for any info. I hope that I have explained this correctly. I am not much of a phone guy.