Hi,
The issue I have is on an MX-ONE 3.2 system, although I guess it would be the same in MD110/TSW.
I have 5-digit extensions (5xxxx), and a 3-digit PRI code (435) for DID. Since the numbering plan in the PSTN is 7-digit, I have done number conversion (CNVTYP=0, ENTRY=435, NUMTYP=4, TRC=2)...