Cisco AS5300-96VOIP-A Manual de usuario descargar pdf (Pagina 2)

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Figure 2 AccessPath-VS3, Large Scale Carrier Class VoIP Solution

Quality of Service

Today, major enterprises and service providers are deploying

worldwide toll-quality VoIP networks. Cisco voice

technology maintains carrier-quality communications in the

face of most adverse network conditions, including packet

delay and packet loss. Both packet loss and packet delay can

have a significant adverse impact on speech quality.

Thehigh-performancevoicecoprocessordesignofCisco

voice gateways minimizes delay and packet loss during the

voice encoding and packetization process. Cisco QoS

features, including IP Precedence, Resource Reservation

Protocol (RSVP), Weighted Fair Queuing (WFQ), Weighted

Random Early Detection (WRED), andMulticlass Multilink

PPP (MP) fragmentation and interleaving, implemented on

both the voice gateways and backbone routing

infrastructure, can provide a low-latency, high-reliability

path for sensitive voice trafﬁc through today’s networks.

In Mier Communications tests, the Cisco AS5300/Voice

Gateway exhibited the lowest latency of any VoIP

product—using industry-standard H.323 and G.729

CODEC. The Cisco AS5300/Voice Gateway VoIP solution

typical latency clocked in their lab was only 70 milliseconds.

Applications

Service Provider Long-Distance Services

Service providers (SPs) can leverage their existing IP

infrastructure to deploy VoIP. The Cisco packet telephony

solution is based on H.323, an ITU standard that provides a

foundation for data, audio, and video, and communications

across IP-based networks. Because SPs already offer Internet

access, they can readily offer long-distance service

by incrementally adding voice-enabled Cisco AS5300/Voice

Gateway ports, additional Primary Rate Interface (PRI),

T1, or E1 interfaces to the PSTN, and a gatekeeper to serve

multiple gateways. The Cisco 2600 and 3600 can be utilized

as a gatekeeper. The Cisco AS5300/Voice Gateway voice

gateway is also interoperable with other vendors’ H.323

gatekeepers. The service provider can use existing RADIUS

servers for authentication, authorization, and accounting

(AAA) as well as existing routers and Ethernet switches

located in the POPs.

The voice gateway application software enables the

router to connect voice calls between PBXs, key systems, or

PSTN circuits, transporting the conversations across an IP

network. Incoming calls are terminated on the voice/fax

feature card, where the voice is encoded using ITU standard

algorithms, compressed and encapsulated in Real-Time

Protocol (RTP) packets.

Additionally, the Cisco AS5300/Voice Gateway voice

gateway has an IVR application that providesvoice prompts

and digit collection in order to authenticate the user and

identify the call destination.

A variety of IVR scripts are provided by the Cisco IOS

software; for example:

• Announcement—can be used as part of a script to greet the

user and identify the service

• Automatic number identiﬁcation (ANI)-based automatic

authentication

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