Sip Components - Samsung Ubigate iBG3026 Configuration Manual

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CHAPTER 28. SIP Gateway Management

Handles the transfer and termination of calls

SIP supports the transfer of calls from one endpoint to another. During a

call transfer, SIP simply establishes a session between the transferee and

a new endpoint(specified by the transferring party) and terminates the

session between the transferee and the transferring party. At the end of a

call, SIP terminates the sessions among all parties.

SIP Components

SIP is a peer-to-peer protocol. The peers in a session are called user agents.

A user agent can function in one of the following roles:

User-agent client(UAC)

A UAC is capable of generating a request based on some external

stimulus(the user clicking a button, or a signal on a PSTN line) and

processing a response.

User-agent server(UAS)

A UAS is capable of receiving a request and generating a response

based on user input, external stimulus, the result of a program

execution, or some other mechanism.

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 user agent that initiated the request.

SIP proxy and

redirect servers

Figure 28.1 Architecture of SIP Network

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