Extend ring time before calls divert to voicemail

1. From your mobile handset dial * * 61 * 3 2 1 * * [Number of Seconds] #

Note: The number of seconds must be in a multiple of 5 (e.g. 5, 10, 15, 20) with a maximum of 30 seconds.
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2.  Once you click the dial button you will hear a confirmation via a voice prompt.
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