Allow the routing of incoming calls based on parts of the SIP information, similar to source identification.
It would be just another option under the 'Configure where calls should be routed...' area
and it could be ' dial the number found in' and then a pull down to select 'To : User part' etc
or Perhaps you could have a 'routing tab' in addition to the incoming parameters and outgoing parameters tab.
The underlying code must be mostly there, as this is what the Bridge does.