If you have any bridged appearance and or call coverage buttons, you can set the type of ringing (coverage ring) that should be used when a call alerts on any of those buttons. The options are to use normal ringing, a single non-repeated ring (abbreviated ring) or no ring. The coverage ring setting is only used if you do not already have a connected call. If you already have a connected call in progress, the shorter of the coverage ring and attention ring settings is used.
This is a user setting which will move with you if you hot desk another phone.
1.Press the Features soft key if shown. To do this during a call, press the 
PHONE key and then press the Features soft key.
2.Use the up and down cursor keys to highlight Call Settings. Press Select.
3.Use the up and down cursor keys to highlight Coverage Ring.
4.Press the Change soft key to change the setting.
•Ring - Use normal ringing.
•Abbreviated - Use a single non-repeated ring (abbreviated ring).
•Off - No ring.