Polycom EX Guía Del Usuario

Sends the Zoom in key to the user interface.

Sends the Zoom out key to the user interface.

button up

This command sends the up arrow command to the user interface.

button near left right callhangup

This valid command combines the following commands:

button near

button left

button right

button callhangup

This command specifies the supported call types (ISDN, IP, or both). 
Changes necessitate a system reboot.

Selects H.320 (ISDN) as the supported call type.

Selects H.323 (IP) as the supported call type.

Both H.320 and H.323 are selected.

Displays the selected call types.

callpreference h323

System Info>Admin Setup>Video Network>Call Preference: ISDN 
Video Calls (H.320), LAN/Internet Calls (H.323), or both options.