Our U1911 is connected with PSTN through PRA trunk.
The topology like this:
The extension under our eSpace 1911 make an outgoing call to the phone under PSTN, ringing and connection is normal, but the calling number showed in called phone is not right. The incoming call is correct.
For example, extension 1 make an outgoing call to mobile phone B. B show a calling number with 249726, the right number should be 24972600.