Hi All, I have connected the 3CX to a Mitel MCD via SIP trunks and all is well except that I cannot manipulate the outgoing CLI from extensions on the 3CX (I can do this on the Mitel) I have tried various configuration options on both the 3CX and the Mitel but with no success. The setup is this; 3CX linked to Mitel via SIP trunks (on the same LAN) the Mitel has ISDN30 for outgoing calls, 3CX is configured to route outgoing calls over the SIP trunks and break out over the ISDN. This all works internal calls between the two systems is fine outgoing calls work fine but I cannot change the outgoing CLI for the 3CX extensions. Has anyone managed to get this to work? 3CX is version 12 Mitel is MCD6.0 SP3.