asterisk users - Feb 2007 - Cisco Router for supply a connection from PABX to Asterisk ?

Hi

anyone know if they have a solution in Cisco for:

    1- Connect old PABX (with BRI or PRI) to a cisco router
    2- Connect this cisco router in SIP to a Asterisk Server

I am search if cisco can this and what is the modele for this

Thanks ;=)