Cisco AS5850 Manual do Utilizador descarregar pdf (Página 7)

SIP

SIP is the IETF standard for multimedia conferencing over IP. SIP is an ASCII-based, application layer control protocol (defined in RFCs

2543 and 3261) that can be used to establish, maintain, and terminate calls between two or more endpoints. The SIP implementation on the

Cisco AS5850 Universal Gateway includes support for important features such as third-party call control and RFC 2833 Dual Tone

Multifrequency (DTMF) Relay for interconnection with application-service-provider (ASP) networks.

Similarities Between H.323 and SIP

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Both were designed to address session control and signaling functions in a distributed call-control architecture.

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Both are especially well-suited for communication with intelligent network endpoints.

Although SIP messages are not directly compatible with H.323, both protocols can coexist in the same packet telephony network because

the Cisco AS5850 Universal Gateway can process individual SIP and H.323 calls simultaneously, allowing service providers to integrate

complementary H.323 and SIP services in the same network.

MGCP

MGCP 1.0 is a protocol for centralized control of VoIP calls by external call-control elements known as media gateway controllers or call

agents. It is described in the informational RFC 2705 published by the IETF. Standards-based T.38 Fax Relay and RFC 2833 DTMF Relay

are available with MGCP.

IP Signaling Transport

In addition to the signaling protocols already mentioned, the Cisco AS5850 Universal Gateway also supports the IETF Sigtran Working

Group’s Stream Control Transmission Protocol (SCTP) described in RFC 2960 and the ISDN Q.921-User Adaptation (IUA) layer protocol

described in RFC 3057.

By supporting SCTP and IUA, the Cisco AS5850 can terminate a Primary Rate Interface (PRI) connection and then transport or backhaul

the Layer 3 signaling (Q.931) information to an external signaling controller or media gateway controller (MGC). The signaling controller

or MGC processes the PRI Q.931 call-control messages and then communicates with the Cisco AS5850 through MGCP to signal call-

handling procedures.

SCTP and IUA can handle Facility Associated Signaling (FAS), Non-Facility Associated Signaling (NFAS), and NFAS with backup D

channel.

Programmable Interactive Voice Response Using Tool Command Language 2.0

Integrated, programmable interactive voice response (IVR) extends the ability of the Cisco AS5850 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, and the prompts used in a TCL IVR 2.0 script can be either static or dynamic. The

scripts are event-directed, and the flow of the call is controlled by a finite-state machine (FSM) 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 TDM or VoIP

call legs. Real-Time Streaming Protocol (RTSP)-based prompts are supported. TCL IVR 2.0 offers enhanced multilanguage support by

providing the capability to add new languages and text-to-speech (TTS) notations to the core IVR infrastructure. Support is available to

companies that are developing or modifying TCL IVR 2.0 scripts through the Cisco Developer Support program.

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