[Users] Mediaproxy Selection for Inbound DID calls

Hi All I would like to be able to have a difference Mediaproxy group selected per user account on inbound DID calls. Our termination provider sends the calls to our openSER with a URI of something <number>@<IP_address>. '08723451234@202.xxx.xxx.xxx', we use the alias_db_lookup("dbaliases") function to resolve the phone number to a user account on the DID calls. I would think that some type of rewrite of the '@202.xxx.xxx.xxx' would need to be done but I'm sure this would cause other issues. Any ideas would be great :) Thanks Mike