You can program the number of times that an extension will ring before the call goes to voicemail.
•If an extension has call coverage and voicemail active, covered calls ring at the covering extension for the specified number of call coverage rings:
•If the covering extension does not answer, the call is routed to the voice mailbox of the extension that activated Call Coverage after the specified number of VMS Cover Rings.
•If the covering extension has Do Not Disturb active, the call is routed immediately to the voicemail.
•One ring is approximately 5 seconds.
•For IP Office Basic Edition 6.1 and higher+ the option 0 for immediate voicemail is available. 0 is the only value useable for phantom extensions. If selected it has the following effects.
•For a call that would have otherwise have alerted at the extension, the call now goes immediately to voicemail.
•If the extension has call forwarding set, the forwarded call will continue ringing at the forwarding target rather than going to voicemail.
•If the extension is the target for another extension's call forwarding, the call will go immediately to the forwarding extension's voicemail.
1408/1416/9504/9508 Phone
1.At either of the first two extensions on the system, press Admin.
•To do the above during a call, you may need to press the 
PHONE button to display the Admin soft key option. If you access phone administration during a call, only the 
SPEAKER, 
MUTE and 
HEADSET buttons still affect the connected call.
2.Use the 
up or down 
arrow buttons to scroll the display to System Administration. When highlighted, press Select.
3.Use the up or down arrow buttons to scroll the display to Extensions. When highlighted, press Select.
4.Use the up or down arrow buttons to scroll the display to VMS Coverage Rings. When highlighted, press Select.
5.At the Extension: prompt enter the extension you want to edit.
6.The current setting is displayed.
7.Enter the number of rings required, between 1 and 9. The default is 3 (15 seconds).
•Alternatively use the 
left or right 
arrow icons to toggle through the settings or Default to return to the default setting.
8.Use the up or down arrow buttons to select another extension to adjust if required.
•Exit programming by pressing PHONE. Alternatively use the Back button to move to another menu.
M7324/M7324N/M7310/M7310N/T7316/T7316E Phone
1.At either of the first two extensions on the system, press 
Feature **config (ie. Feature **266344).
•If the system has a system password set, it is requested. Enter the password.
2.The phone displays System Admin.
3.Dial #321. The phone displays VMS Cover Rings.
4.Enter the number of the extension to be programmed.
5.Enter the number of rings required, between 1 and 9. The default is 3 (15 seconds).
•Alternatively use the Next Data or Previous Data buttons to change the setting or press Remove to return to the default setting.
6.Press the Next Item or Previous Item button for the next or previous extension respectively.
•To exit phone based administration at any time, press the Release button. To select a different process use the Next Procedure or Previous Procedure buttons or dial another feature code.
ETR 18D/ETR 34D Phone
1.At either or the first two extensions on the system, press Feature 0 0 followed by two presses of the first intercom or call appearance button.
2.System Administration: is shown on the display.
3.Dial #321. The phone displays VMS Cover Rings.
4.Enter the number of the extension to be programmed.
5.Enter the number of rings required, between 1 and 9. The default is 3 (15 seconds).
•Alternatively use the Next Data or Previous Data buttons to change the setting or press Remove to return to the default setting.
6.Press the Next Item or Previous Item button for the next or previous extension respectively.
•Exit programming by pressing Feature 00. You can also exit programming mode by lifting the handset, then placing it back in the cradle.