I found the fix for this on the following thread, in the last post :Intercom not working
My question is, is there a way to edit the setting on an idividual phone, since we don’t use a provisioning server and therefore can’t just edit a sip.cfg file?
I simply need to change voIpProt.SIP.alertInfo.1.value="Ring Answer"
to:
voIpProt.SIP.alertInfo.1.value=“info=Auto Answer”
So I bought and setup the End Point Manager module, and after provisioning the phones that way, using 4.1.7 firmware, the intercom/paging works as it should.
Obviously, I could have provisioned them by creating/editing the files themselves and setting up my own TFTP server, but I am inexperienced in that area and was short on time.