The Cisco Catalyst 4500 Access Gateway Module (AGM) enables
organizations to implement integrated IP Telephony and WAN services at campus
and integrated branch office sites. The combination of the WAN and voice
infrastructure into Cisco Catalyst 4500 Series switches gives organizations the
ability to reduce network complexity, enhance employee productivity, and
improve network deployment times through an integrated platform while preparing
for data, voice, and video convergence across the enterprise.
The Cisco Catalyst 4000 AGM can be deployed in both Cisco Catalyst 4500
Series and Catalyst 4000 Series chassis which run either Catalyst OS (CatOS) or
Cisco IOS® Software and is fully compatible with all Supervisor Engines. You
can deploy multiple AGMs in the chassis to support higher density requirements
or provide a higher level of availability and
The Cisco Catalyst 4000 Access Gateway Module has three modes of
Voice network services
The Cisco Catalyst 4000 AGM is supported in the Catalyst 4500 and 4000
Series chassis with any Supervisor Engine that runs CatOS 5.5(1) or Cisco IOS
Software Release 12.1(13)EW or later. The AGM itself runs a separate instance
of Cisco IOS Software that must be release 12.1(5)YF or later to support CatOS
Supervisor Engines or release 12.2(13)T or later to support Cisco IOS
These tables show in detail the voice and data interfaces that are
supported along with the minimum release of Cisco IOS Software required. The
Catalyst 4000 AGM is supported in the Catalyst 4003 and 4006 and requires Cat
OS 5.5(1) or later.
Survivable Remote Site Telephony (SRST)—The Cisco
CallManager can be used for centralized control of the Cisco Catalyst 4000 AGM
at campus and branch sites. The AGM supports both Media Gateway Control
Protocol (MGCP) and H.323v2 interfaces to the Cisco CallManager. SRST enables a
resilient IP Telephony service when connectivity to the Cisco CallManager is
lost. The AGM provides SRST for up to 240 IP phones.
Audio-conferencing—The digital signal processor
(DSP) farm on the Cisco Catalyst 4000 AGM can be used to support on-demand and
dedicated reservationless audio-conference services for local and remote users.
Audio transcoding between G.729 and G.711 enables efficient communications
between callers who use different codecs (for example, campus phones that use
G.711 and remote site phones that use G.729).
Fax/modem/PBX voice gateway—Foreign exchange station
(FXS) ports on the Cisco Catalyst 4000 AGM can support up to 22 fax machines,
speakerphones, modems, analog phones, and PBX lines to supplement IP phones at
a campus or branch.
Public Switched Telephone Network (PSTN) voice
gateway—The Cisco Catalyst 4000 AGM incorporates a 96-channel DSP farm
with up to six digital (T1, E1, Primary Rate Interface [PRI], Basic Rate
Interface [BRI]) or analog Foreign Exchange Office (FXO) interfaces with
compression and echo cancellation services for connectivity to the PSTN or toll
bypass with ISDN dial backup. Signaling support includes T1 channel-associated
signaling (CAS), BRI signaling, ISDN PRI, Q.SIG, and R2 signaling.
Cisco IOS Multiprotocol routing—The Cisco Catalyst
4000 AGM supports multiprotocol routing with support for IP, IPv6, Internetwork
Packet Exchange (IPX), AppleTalk and System Network Architecture (SNA) as well
as Web Cache Control Protocol version 2 (WCCPv2).
WAN interfaces—Up to six WAN interfaces are
supported per module, which includes T1, E1, PRI, BRI, and serial ports.
WAN security—Security options include firewall,
intrusion detection system (IDS), Network Address Translation (NAT) and
hardware-based IP security (IPsec) with 3DES data encryption for secure VPN or
public Internet connectivity. The Encryption Service Adapter (ESA) is a
high-performance data encryption module that implements data encryption and
authentication algorithms. For more detail about ESA, refer to
4000 Service Encryption Adapter Installation and Configuration
Quality of service (QoS)—Features such as the
Resource Reservation Protocol (RSVP), Protocol Independent Multicast (PIM),
traffic shaping, custom and priority queuing, Low Latency Queuing (LLQ), and
Weighted Fair Queuing (WFQ) ensure a consistent QoS for data, voice, and video
applications over the WAN.