Cisco ATA 191 Manuel de démarrage rapide - Page 2

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SIP Capabilities

Note

SIP for the ATA 191 is compliant with RFC2543.

SIP Capabilities

Session Initiation Protocol (SIP) provides these capabilities:

• Determines the availability of the target endpoint. If the target endpoint is unavailable, SIP determines

• Determines the location of the target endpoint. SIP supports address resolution, name mapping, and call

• Determines the media capabilities of the target endpoint. Using the Session Description Protocol (SDP),

• Establishes a session between the originating and target endpoint. If the call can be completed, SIP

• Handles the transfer and termination of calls. SIP supports the transfer of calls from one endpoint to

SIP is a peer-to-peer protocol. The peers in a session are called User Agents (UAs). A user agent can function

in one of these roles:

• User agent client (UAC)—A client application that initiates the SIP request.

• User agent server (UAS)—A server application that contacts the user when a SIP request is received and

Typically, a SIP endpoint is capable of functioning as both a UAC and a UAS, but functions only as one or

the other per transaction. Whether the endpoint functions as a UAC or a UAS depends on the UA that initiated

the request.

From an architectural standpoint, the physical components of a SIP network can also be grouped into two

categories—Clients and servers. The following figure shows the architecture of a SIP network.

Note

SIP servers can interact with other application services, such as Lightweight Directory Access Protocol (LDAP)

servers, a database application, or an extensible markup language (XML) application. These application

services provide back-end services such as directory, authentication, and billable services.

Cisco ATA 191 Analog Telephone Adapter Overview

whether the called party is already on the phone or didn't answer in the allotted number of rings. SIP

then returns a message indicating why the target endpoint was unavailable.

redirection.

SIP determines the lowest level of common services between endpoints. Conferences are established

using only the media capabilities that all endpoints support.

establishes a session between the endpoints. SIP also supports midcall changes, such as adding another

endpoint to the conference or changing the media characteristic or codec.

another. During a call transfer, SIP establishes a session between the transferee and a new endpoint

(specified by the transferring party). SIP also terminates the session between the transferee and the

transferring party. At the end of a call, SIP terminates the sessions between all parties. Conferences can

consist of two or more users and can be established using multicast or multiple unicast sessions.

returns a response on behalf of the user.

Cisco ATA 191 Analog Telephone Adapter Overview