Belkin F5D5230-F Guia do Utilizador descarregar pdf (Página 8)

Porta SIP

System Concepts

PortaSIP Components

Back-To-Back User Agent

(B2BUA Vovida)

SIP Express Router

(SER)

Porta

RTP

Proxy

Media

Server

RADIUS

Client

RADIUS

Client

Porta Proprietary

RADIUS

SIP UA SIP UA

SIP

RTP

Billing100Porta

PortaSIP consists of the following main components:

• SIP Proxy Server (SIP Express Router on the diagram): The SIP

Proxy Server performs a number of functions, such registering

SIP telephones, dealing with NAT issues, etc.

• Back-To-Back User Agent (B2BUA): The B2BUA SIP-based

logical entity can receive and process INVITE messages as a SIP

User Agent Server (UAS). It also acts as a SIP User Agent Client

(UAC), determining how the request should be answered and how

to initiate outbound calls. Unlike a SIP proxy server, the B2BUA

maintains the complete call state. Integrating B2BUA with

PortaSIP ensures that every call made between endpoints (off-net,

on-net, etc.) is authorized, authenticated and billed. The system is

also able to provide “Debit” billing (i.e. to disconnect a call if the

account balance falls below zero).

• RTP Proxy: The RTP Proxy is an optional component used to

ensure a proper media stream flow from one SIP telephone to

another when one or both of them are behind a NAT firewall.

• Media Server: The Media Server is used to play a number of short

voice prompts to an SIP user when an error occurs, such as zero

balance, invalid password, and so on.

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Belkin F5D5230-F Guia do Utilizador Página 8