I know this has come up many times before since cell phones made the switch to VoLTE, but I'm still struggling to find the solution for our own Mitel 3300 PBX (running Release Level 7.2 SP1 PR1, Active Software Load: 13.2.1.27). Before VoLTE was enabled, extensions from within our company were forwarded to our cell phones (which as a part of a personal ring group) and would show up as a 4 digit extension. However, with VoLTE enabled, they now show up as unknown on the caller ID.
Where should I start looking to try and correct this so that either the full # is passed through or even just the 4 digit extension again? Or what other information can I provide to help narrow down the scope of this question a bit?
Thank you.