I assume that you want to divert your voice calls when you don't answer your calls. In that case you should select Forward if Not Answered then use the following GSM string: *61*[Phone Number]*11*[Time]# In place of phone number put in your voice mail box number and in place of time put any value i.e. 5, 10, 15, 20, 25 or 30. These values are seconds after which your calls will be diverted/forwarded to voice mail. Setting a higher value will meet your query.
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