Comet Labs IPTEL-S Manual de usuario descargar pdf (Pagina 24)

8/31/2005 Copyright - Ahlgren 2005 24

AhlTek

Major Components of the SIP

Environment

User

Agents

End-users devices or gateway to other networks

- Cell phones, Multimedia handsets, PC’s, PDA’s;

UAC - User Agent client initiates the message,

UAS - User Agent server responds to the message

Registrar

Servers

Data base of all User Agents within a domain.

Retrieve participants IP address and forward to the Proxy Server

Proxy

Severs

Accept Session Requests,

Query Registrar Server for recipients’ address

Redirect

Servers

Allow SIP Proxy Servers to direct SIP sessions to external domains

Note - All ‘servers’ above may reside in the same hardware

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Comet Labs IPTEL-S Manual de usuario Pagina 24