To set up SIP presence on Linksys SPA942, follow these steps:
Login to the Web Configuration Menu
Click "Admin" -> "Advanced" -> "Phone".
Scroll down and look for "Line Key Extended Function" under the "Line Key 4" section
Select your server type from the "Server Type" drop-down list.
For each extension or user that you want to monitor using the SPA942, you must setup a separate configuration in one of the Line Key fields:
Change the "Extension" to "Disabled".
Enter a Short Name, this name appears as the text next to the button on the phone.
Change "Share Call Appearance" to "shared".
In the "Extended Function" field, you must enter line "fnc=blf;sub=monitored_extension@your_server_ip;nme=monitored_name", in which you replace the monitored_extension, your_server_ip (the ip/hostname of your server) and monitored_name fields with your custom values.
For example, if you want to monitor John Smith's extension no 500, on a server with the IP address 192.168.100.1:
fnc=blf;sub=500@192.168.100.1;nme=JohnS
Click "Submit"
Reboot the phone
The light that has been set up will have the following behaviour, depending on the state of the monitored extension:
If the extension is idle, the light will be GREEN
If the extension is in use, the light will be RED
If the extension is ringing, the light will be RED and blinking
This information is listed in the attached guide. When you open it, search for Extended Function or go to page 241 for the documented syntax.
Bill