How to add a route header base the different host part of request-uri ?

Hi Experts,

 

I want to add route header base the different host part fo request-uri  when SMX recevied an INVITE message and forward the to an external AS. For example:

 

SMX will add a route header such as "Route:<sip:apktlab.net;lr;call=term>" when the user part of request-uri is 1234015 - 1234019. And SMX will add a route header such as “Route:<sip:apktlab.net;lr;call=term_unregistered>” when the user part of request-uri is 1234000 - 1234014. 

 

Thanks a lot.

 

Songtao