I've got a 3CX system setup on an internal server and 5 Cisco SPA504G Phones. I'm trying to configure the unused line keys on the phones to be Speed Dial, Busy Lamp Field, and Call Pickup buttons for other extensions in the office. This is the setup I used under the 'Phone' tab for each unused Line Key:
Share Call App: shared
Extended Function: fnc=blf+sd+cp;sub=11@$PROXY;ext=11@$PROXY;nme=11
11 is obviously the extension I'm trying to monitor. The speed dial function works fine so I know it's close to being correct but the LED shows Orange on the phones which I know means the line isn't registered. Other than the settings mentioned above, what else needs to be configured to get the BLF working as well as the CP? I've tried many things without any luck.
Side note, we are able to make calls and everything on these phones so the system is fully working. This is my last task is to get the BLF's working.
Thanks in advance.