How to configure Phone Lines
From SIPfoundry sipXecs IP PBX, The Open Source SIP PBX for Linux - Calivia
After you've created users and phones, you need to assign users to their phones.
Assign user(s) to the phone
Click on Add Line. You can search for a specific user or just click Search with empty fields, which will list all users. Select a user and press Select. You have now attached that user to the device. Dependent on the phone model, several lines can be attached to a device.
