Calls dropping on reinvite (15min) when followme is enabled

Hello All,

As the title says, I have a weird issue that pops up only when follow me is enabled on the extension and the call isn’t directly going to that extension. I’ve done many tests to narrow it down, and have been working with the trunk provider to try and sort this out, but have been unsuccessful so far. A summary of what happens:

Incoming Call > Reception Desk > Extension(FollowMeEnabled) > Call Drops at REINVITE
Incoming Call > Reception Desk > Extension(FollowMeOff) > REINVITE OK
Incoming Call > IVR > Extension(FollowMeEnabled) > Call Drops at REINVITE
Incoming Call > IVR > Extension(FollowMeOff) > REINVITE OK
Incoming Call > Extension(FollowMeEnabled) > REINVITE OK
Incoming Call > Extension(FollowMeOff) > REINVITE OK

When the calls are dropped, it seems the Invite comes in and the PBX responds with 481 Call Does Not Exist.

I have run many tests, and have used other trunks without issue, however these trunks are not sending the reinvites.

FreePBX 13.0.190.7
Asterisk Version: 13.7.1