Cisco 450 Manual de instalación del hardware - Página 5

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Overview of Cisco VG450 Voice Gateway

Analog Phone Connectivity

Cisco 450 Voice Gateway are ideal for analog phone deployments ranging from centralized to sparsely

concentrated or distributed topologies. Cisco 4000 Series Integrated Services Routers offer many supplementary

analog calling features, depending on the call control and signaling type used. All supplementary analog

features are supported through the FXS and FXO service modules. The analog interface on Cisco 4000 Series

also supports Feature Access Codes (FACs) for invoking supplementary services.

FXS ports on Cisco 450 Voice Gateway support fax machines and modems. When using fax machines, the

gateways support T.38 fax relay and fax pass-through. T.38 fax relay technologies allow transfer of faxes

across the network with high reliability using less bandwidth than a voice call. All modems can be connected

to the Cisco VG Series Gateways and are transferred over the network using modem pass-through.

The voice gateways support the following protocols:

• SCCP

• H.323v4

• MGCP

• SIP

• Real-Time Transport Protocol (RTP)

• Secure Real-Time Transport Protocol (SRTP)

• Trivial File Transfer Protocol (TFTP)

• HTTP server

• Simple Network Management Protocol (SNMP)

• Telnet

• Dynamic Host Configuration Protocol (DHCP)

• DNS

• Cisco Unified Communications Manager or Cisco Unified Communications Manager Express redundancy

• Call survivability: MGCP failover to an H.323 connection to the Survivable Remote Site Telephony

• T.38 fax relay and modem pass-through

• Codec support: G.711, G.729. G.729a will be used if the gateway does not support G729 annex b

• RADIUS and TACACS+ for Telnet and authorization

The following table lists the feature specifications for Cisco 450 Voice Gateway.

Table 1: Cisco SM-X Single-Wide Service Module Feature Specifications

Feature

SM-X-8FXS/12FXO

Tip and Ring

Interface for each

FXS port

support using Hot Standby Router Protocol (HSRP)

(SRST) router

SM-X-16FXS/2FXO

SM-X-24FXS/4FXO

Cisco 450 Voice Gateway Hardware Installation Guide

Analog Phone Connectivity

SM-X-72FXS