Extend the ring time on your Telstra mobile

By default, your phone rings for 15 seconds before diverting a call to MessageBank® – you can change this using increments of five seconds (up to 30 seconds).

Extending your ring time

To extend the ring time, enter the following sequence on your mobile phone:

**61*101**(number of seconds: 15, 20, 25 or 30)#

For instance, to extend your ring time to the maximum of 30 seconds:

**61*101**30#

Then press the call/send button.

Restoring or removing original settings

To restore all three conditional call forwarding settings (Busy, No Answer, No Reply) to MessageBank®, enter:

 **004*101#

To remove all three conditional call forwarding settings (Busy, No Answer, No Reply) to MessageBank®, enter:

 #004#

Both of these actions will set the default ring time of 15 seconds.

Source: http://crowdsupport.telstra.com.au/t5/General-Mobiles/How-to-extend-the-ring-time-of-my-mobile/td-p/122064