Hi Michael,
On the phone configuration page, you can check the "Always Use Prime Line" setting. This parameter specifies whether the primary line on an IP phone will be selected, if available, when the user goes off-hook. If this parameter is set to True, when a phone goes off-hook, the primary line gets chosen and becomes the active line. Even if a call is ringing on the user's second line, going off-hook makes only the first line active; it does not answer the ringing call on the second line. In this case, the user must choose the second line to answer the call. If this parameter is set to False, the IP phone automatically chooses an available line as the active line.
Manish
