Note: This was all working fine until this morning and nothing has changed.
We have a snom one set up and working with accounts 41,42,43,44,49 and 7808 (for an odd DDI). Mine is 44. Accounts 41 and 43, when they dial 44 from their main phones get a "Forbidden" error. account 7870 is logged on to the same phone as 41 and that identity can ring 44 just fine from the same physical phone that account 41 can't. 49 can also ring me fine. Agent groups I am in can call my phone and my DDI works just fine.
I have rebooted my phone, the phone of 43, and the server, all with no effect.
Can anyone help me out here please, this is very odd behaviour and it's diving me insane.