Staring with RadiusCat 2.x you can set the Outbound Caller ID for SIP Accounts by doing the following:
- Log into the RadiusCat 2.x interface with Admin or Customer credentials
- Click on the 'Account' menu link and search for the Account in question
- Click on the Account and click the 'Outbound Caller ID' TAB
- Enter the telephone number for the Caller ID
- Click the Save button to save
http://svkwiki.com/wiki/Configuring-Outbound-Caller-ID-(CLI)

