Cisco AS5300 SERIES UNIVERSAL GATEWAYS AS535-8E1-210-AC 数据表

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V.92 and V.44 are the latest modem standards adopted by the

industry. The standards specify a set of features that allow modems

to mimic many of the benefits of broadband, including:

• V.44 increases throughput by more than 100 percent when

surfing the Internet

• V.92 Modem on Hold suspends an Internet session to place or

receive a phone call

• V.92 Quick Connect provides a faster connect time to the

Internet

Service providers can offer revenue-generating services and increase

subscriber retention with V.92 and V.44 standards. Cisco Remote

Authentication Dial-In User Service (RADIUS) support for Modem

on Hold will allow premium subscribers to suspend their Internet

sessions for longer periods of time to place or receive phone calls.

Quick Connect saves the line conditions of the last number dialed,

encouraging subscribers to dial into the same ISP to reduce

connection time. Combined with greater compression and

connection speeds, V.92 and V.44 allow service providers to offer

their subscribers a “broadband-lite” experience, which enables

Internet users to experience the qualities usually associated with

broadband for the price of dialup or modem access.

The framework for VoIP services on the Cisco AS5350 Universal

Gateway is based on open interfaces and standards, and it allows an

ecosystem of partners to work together to develop innovative

network services. Service providers are not locked into a single VoIP

signaling technology when they choose the Cisco AS5350 —H.323,

Session Initiation Protocol (SIP), Media Gateway Control Protocol

(MGCP), and Trunking Gateway Control Protocol (TGCP) support

are all built in. This allows service providers to enable the call

control protocol that is the best fit for their network today, with the

assurance that they can respond to evolving market requirements

whenever necessary.

Leading the industry through the adoption of new standards-based

H.323 technology, the Cisco AS5350 Universal Gateway supports

the scalability enhancements introduced in H.323v3 and H.323v4.

For example:

• Multiple concurrent calls can be supported over a single H.225

call-signaling channel to reduce call-setup and call-clearing times

and increase network call capacity.

• H.225 messages can be transported over TCP or User Datagram

Protocol (UDP) as described in H.323 Annex E. Using UDP for

call-signaling transport effectively enables media cut-through in

a single round trip.

• Ability to report capacity statistics to the gatekeeper on a

per-call basis for each DS0, trunk group, or carrier associated

with the public switched telephone network (PSTN)-side

interfaces to assist in routing decisions.

The Cisco AS5350 Universal Gateway supports a broad array of

proven, interoperable H.323-based solutions for service provider

networks including global long distance, distributed prepaid

calling, SS7 interconnect, telephony application hosting, and

unified communications.

SIP is the Internet Engineering Task Force (IETF) standard for

multimedia conferencing over IP. Defined in RFC 2543, SIP is an

ASCII-based, application-layer control protocol that can be used

to establish, maintain, and terminate calls between two or more

endpoints. The SIP implementation on the Cisco AS5350 Universal

Gateway includes support for key features such as third-party call

control and RFC 2833 dual-tone multifrequency (DTMF) relay for

interconnection with ASP networks.

• Both were designed to address session control and signaling

functions in a distributed call-control architecture

• Both are especially well-suited for communication with

intelligent network end points

Although SIP messages are not directly compatible with H.323, both

protocols can coexist in the same packet telephony network because

the Cisco AS5350 Universal Gateway has the ability to process

individual SIP and H.323 calls simultaneously. This allows service

providers to integrate complementary H.323 and SIP services in the

same network.