The Cisco IP Phone 7985G, which is actually a Tandberg 150 video unit running Cisco SCCP software, emulates a Cisco 7940 IP Phone. Therefore, you have 2 'lines' available and potentially a few speed dials depending on the 7985G phone load.

Remember that Cisco CallManager 4.0 and higher isolates conventional legacy PBX 'lines' and extensions. A single 'button' on a Cisco IP Phone can be hundreds of 'lines' from a legacy PBX comparison perspective.

It would be more informative if you stated what you are trying to accomplish...