CU500 Extend Ring Time Before Voicemail
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The time your phone will ring before going to VM can be set to between zero and 30 seconds. 30 seconds equals about 6 rings. I think the default is 20 seconds, or 4 rings.

To set the delay:

Determine your local service center number (this may or may not be the one you actually use to retreive your VM) with *#67# [send].

Rings before answer: *61*(SC)**30# where SC is the 10 digit number you determined in the first step. 30 is the number of seconds in this example. 0 to 30 will work.

When I make this change, the message I see showing success is "Forward set -if no answer."


edit: make sure you include the + in the service center number.. example: if your voicemail number shows up as 18008885555 you would type: *61*+18008885555**30#