Hi Cyril,
After translating your question, I understand it better.
If you use SIP trunk, it depends on the configuration of "Use as Calling Line ID" in "Inbound Calls" page. If this box is checked, UC320W will use this phone number as the Calling Line ID (CLID) for outbound calls from the user or group that you selected for the daytime Ring. The Calling Name ID will be the user's name. When the Ring is a hunt group, the specified phone number will be the CLID for all members, although the individual's Calling Name will be used. If a member has an individual CLID, the individual CLID will be used instead. If the Use as Calling Line ID box is unchecked, the CLID is the default phone number for the trunk. Please see the screen capture.
If you use FXO, the calling number displayed for the outbound call depends on the phone number provided by service provider for the FXO phone line.
Hope it helps.
Best regards,
Wendy Yang
