Catalyst 4000 Modules
.. The Catalyst 4000 Access Gateway Module (AGM) provides voice
network services to the Catalyst 4000 switch,VoIP IP WAN routing, and
an IP telephony mode for use with a voice gateway.The Catalyst 4000
AGM supports voice interface cards (VICs) and WAN interface cards
(WICs) from the 1600/1700/2600/3600 Series routers.