Hi Chamvari,
In the SIP user ID table, you should include credentials from the ISP i.e.
1. Registration User ID
2. Authentication User ID (Usually same as registration user ID)
3. Authentication Password
In the contact number field, if the ISP provided you a user ID then select User ID here. This will be used in SIP invite. If you use "STA" the corresponding STA # will be send.
In contact field you can set the public number (DID) that you will present when dialing out (depends on the ISP).
On the other hand, DID conversion can be done using the "Digit Conversion Table".
Just be careful when setting up these tables to include different tables for CO Lines (PGM 160) and Stations (PGM131). The trick is that we can set rules (digit conversion) for incoming calls and digit conversion for outgoing calls and it's all done in the same tables. So, if lets say you set a rule in Digit Conversion Table 1 that will apply for incoming calls, and by mistake leave the Digit Conversion Table 1 as selection in "Station DN Attributes", you will for sure have problems when dialing out.
Please check these settings if you experience problems with dialing in/out.
Regards,
Ivo