RE: Creating a secure VoIP infrastructureVoIP implementations use multiple protocols like H.323, SIP,MGCP, and SCCP—all of which function completely differently and interactwith security in ways that traditional firewalls cannot handle. Also the needis to inspect both parts of a VoIP call—the call setup messages and theactual call media stream. Added to this is the usage of both static ports andrandom dynamic ports, coupled with