Cisco Small Business Voice Systems (Linksys Business Series)

To enable the Music on hold feature on SPA9XX IP phones, follow the directions below.

Step 1:
Using an SPA IP phone, press the Setup  button.

Step 2: 
Go to Network (9) using the Navigation  button.

Step 3: 
Select Current IP (2) will show the IP address of the SPA941.

Step 4:
Open a browser, enter "http://spa_ip_phone_ip_address" on the address bar and press [Enter] or click Go. The web-based utility should open like the window below.

Step 5:
Click  Admin Login on the upper right and go to advanced. Additional tabs will appear as shown in the figure below.

Step 6: 
Go to EXT 1 tab and under Call Feature Settings, look for MOH Server. Enter "imusic" on the field and click submit all changes as shown on the figure below.