Thanks very much for all your input. The problem is now resolved by setting "YES" to "CW Setting" in the USER TAB.
However, I am having trouble configuring the SHARE LINE APPEARANCE.
I wish to have LINE 2 Button on all my 4 SPA942 phones registered as ext. 117 so that when LINE 2 is in used - all other phones can see the RED light on LINE 2. Currently, all my phones can registered successfully and make outgoing calls on line 2 one at a time. However, I can't tell whether LINE 2 is in used unless I try to dial out using line 2 where it immediately "CALL ENDED".
Thank you very much for all your assistance.