Voicemail advance option

Hi I am using Asterisk1.4 .When I retrive voicemail it also says press 3 for advance option when I press 3 it give me option to callback the person who leave VM. But problem is in my dial plan I add prefix 9 to call outside (992204038) and from voicemail it only give phone number (92204028) so is their any possibility that I can add 9 automatically to call outside.

Please let me know if anyone done this configuration also let me know the configuration.