Cisco AS5300 SERIES UNIVERSAL GATEWAYS AS535-8E1-210-AC データシート

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MGCP 1.0 is a protocol for centralized control of VoIP calls by

external call-control elements known as media gateway controllers

(MGCs) or call agents. MGCP is described in the informational RFC

2705, published by the IETF.

The Cisco AS5350 Universal Gateway includes support for the

MGCP network access server (NAS) package. This allows the

platform to operate simultaneously as a network access server and

a voice gateway to deliver universal port services in an MGCP

network. Standards-based T.38 Fax Relay and RFC 2833 DTMF

Relay are available with MGCP.

The Cisco AS5350 also supports the PacketCable Trunking

Gateway Control Protocol (TGCP) 1.0. PacketCable is an

industry-wide initiative to develop interoperability standards for

multimedia services over cable facilities using packet technology.

CableLabs developed the TGCP protocol, which contains

extensions and modifications to MGCP while preserving the basic

MGCP architecture and constructs.

The Cisco AS5350 Universal Gateway has the ability to interpret

Voice Extensible Markup Language (VoiceXML) documents.

VoiceXML is an open-standard markup language used to create

voice-enabled Web browsers and interactive voice response (IVR)

applications. Just as HTML enables users to retrieve data with a PC,

VoiceXML enables subscribers to retrieve data with a telephone.

The accessibility of the telephone and its ease of use make

VoiceXML applications a powerful alternative to HTML for

accessing the information and services that the Internet provides.

The Cisco VoiceXML Solution Infrastructure takes advantage of

Cisco AS5350 DSP resources, signaling, and media-conversion

capabilities to execute VoiceXML application logic at the edge of the

network, offloading servers and the network to support unified

communications services. Cisco VoiceXML gateways support two

standard audio formats for recording and playback: .au

(audio/basic) and .wav (audio/wav). The VoiceXML Store and

Forward feature allows streaming-based voice recording and

playback features for various media including local memory, HTTP,

Extended Simple Mail Transfer Protocol (ESMTP), and Real-Time

Streaming Protocol (RTSP) for 14 different Cisco codecs and the

two standard audio file formats.

Integrated, programmable IVR extends the ability of the Cisco

AS5350 Universal Gateway to support unique and differentiated

voice services. Voice application software developers can use the

Tool Command Language (TCL) IVR 2.0 application programming

interface (API) to create customized TCL scripts that control calls

coming into or going out of the gateway. IVR systems collect user

input in response to recorded messages. The prompts used in a TCL

IVR 2.0 script can be either static or dynamic. The scripts are

event-driven, and call flow is controlled by a finite state machine

that is defined by the TCL script. All verbs are nonblocking—they

can execute without causing the script to wait. Prompts can be

played and digits can be collected over telephony or VoIP call legs.

Real-Time Streaming Protocol (RTSP)-based prompts are

supported. TCL IVR 2.0 offers enhanced multi-language support by

providing the capability to add new languages and text-to-speech

notations to the core IVR infrastructure. The Cisco Developer

Support Program supports companies developing or modifying TCL

IVR 2.0 scripts.

The trunk cards also have a serial and RJ45 interfaces for integrated

SLT functionality. With integrated SLT, the Cisco AS5350 Universal

Gateway provides distributed Message Transfer Part (MTP) SS7

signaling functionality directly on the gateway. Like the Cisco 2600

Series-based SLT, the integrated SLT backhauls upper-layer SS7

protocols across an IP network using Cisco Reliable UDP (RUDP),

terminating the MTP1 and MTP2 layers of the SS7 protocol stack.

Integrated SLT support is available through a software upgrade—no

new hardware is required. MTP3/ISUP backhaul is included. Pricing

is on a per-platform basis.

The extensive voice and fax capabilities of the Cisco AS5350

Universal Gateway can help build a reliable, high-quality VoIP

network. Voice-quality tests confirm that the Cisco AS5350 delivers

end-to-end voice-quality performance that meets the high standards

established for toll-quality voice services in the PSTN. Comprehensive

voice-quality testing is a critical component in the Cisco AS5350

hidevelopment process. Cisco conducts subjective voice-quality tests

to determine mean opinion scores using a methodology derived from

International Telecommunication Union Telecommunication

Standardized Sector (ITU-T) Recommendations P.830 and P.831.

Objective voice-quality tests are also conducted using the Perceptual

Analysis Measurement System.

The high-performance design of the Cisco AS5350 Universal

Gateway minimizes delay and packet loss during voice encoding and

packetization processes. The Cisco AS5350 introduces minimal