Working we Grandstream GXP-2140 / 2160. We have a case where we want calls to a specific DID to ring a phone and be auto-answered. Since the Grandstream phones don’t appear to use the Alert-Info SIP header, but rather the Call-Info header, I don’t see how to do this. Note: Paging works fine as it adds the Call-Info header.
These phones are configured via the Commercial Endpoint Manager module, The PBX is running FreePBX Distro 10.13.66-22. The phones are using chan_sip.
I’m sure I’m just overlooking something obvious.