Cisco AS5400XM Uživatelský manuál stáhnout pdf (Strana 4)

MGCP

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 RFC 3435: Media Gateway Control Protocol (MGCP) Version 1.0, published by the IETF.

Package Types

An MGCP call connection involves a series of events and signals—such as off-hook status, a ringing signal, or a signal to play an

announcement—that are specific to the type of endpoint involved in the call. MGCP groups these events and signals into packages.

A trunk package, for example, is a group of events and signals relevant to a trunking gateway; an announcement package is a group

of events and signals relevant to an announcement server.

The Cisco AS5400XM Universal Gateway supports the following MGCP package types:

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Trunk package

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Generic media package

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Dual tone multifrequency (DTMF) package

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DTMF trunk package (for channel-associated-signaling [CAS] endpoints)

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Multifrequency operator services package (for CAS endpoints)

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Multifrequency Wink Start and Immediate Start package (for CAS endpoints)

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Real-Time Transport Protocol (RTP)

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FXR package for fax transmissions

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Announcement server package

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Script package

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Resource Reservation Protocol (RSVP) package (QoS)

Standards-based T.38 Fax Relay and RFC 2833 DTMF Relay are available with MGCP as well as improved voice-quality metrics.

Voice Quality

The extensive voice and fax capabilities of the Cisco AS5400XM Universal Gateway can help build a reliable, high-quality VoIP network.

Voice-quality tests confirm that the Cisco AS5400XM Universal Gateway 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 AS5400XM Universal Gateway development process. Cisco conducts subjective voice-quality tests to determine mean opinion

scores using a methodology derived from ITU-T Recommendations P.830 and P.831. Objective voice-quality tests are also conducted

using the Perceptual Evaluation of Speech Quality (PESQ) algorithm (P.862), an enhanced perceptual measurement for voice quality in

telecommunications specifically developed for end-to-end voice-quality testing under real network conditions.

The high-performance design of the Cisco AS5400XM Universal Gateway minimizes delay and packet loss during voice encoding and

packetization processes. The Cisco AS5400XM High-Density Packet Voice/Fax Feature Card (AS5X-FC) and DSP Module (AS5X-

PVDM2-64) optimize packetization performance and reduce delay up to 20 percent compared with earlier-generation DSP feature cards.

Cisco QoS features, including IP Precedence, RSVP, Weighted Fair Queuing (WFQ), Weighted Random Early Detection (WRED), and

Multichassis Multilink PPP (MMP) fragmentation and interleaving, implemented on both the universal gateway and backbone routing

infrastructure, can provide a low-latency, high-reliability path for sensitive voice traffic through today’s networks.

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