[Asterisk-Users] Voicemail + SIP Message header

[Lal, Deepak (Contractor)]

I am trying to use Asterisk as a "pure" voicemail system and have the following
setup:
I have the * setup as a SIP peer to a softswitch. When someone calls a number on
the softswitch and no one picks up the phone, the softswitch forwards the call
to the * using SIP. The message header of the SIP INVITE has the number
originally called in the "To:" field, but the INVITE is still being sent to the
number asterisk is configured for. 

Is there any way that I can configure asterisk to "read" the To: field in the
message header of the SIP INVITE and then go to the mailbox of the corresponding
number? 

Thanks

Deepak