Running MGCP and Broadvoice

I am currently in the process of migrating all my Vodavi 6812-MGCP phones into a new test box, running, asterisk and mgcp. Before I begin I am asking if the asterisk system will work as an all inclusive gateway and configurable dialing system. Inbound/Outbound dialing with SIP based lines from Has any successfully accomplished this without a secondary gateway device? Please advise.