Hi, I realized that with new firmware (188.8.131.52), on a UCM6202 with a SIP Trunk registered and a Fanvil IP X4G Phone registered, when I make an outbound call, on phone display appears SIP trunk number instead of calling number and on history calls appears as if I called my own number, I think there is something wrong. Then I downgraded to 184.108.40.206 and everything returns normal.
Sounds like it changed a setting on you. I’d look through your SIP trunk CID settings and compare.
If they are identical I’d open a ticket.
This is known bug already. UCM rewrite number displayed if call have 183 ringing.