Cisco Systems SPA9000 manual Architectural Components, Architectural Component Function

Chapter 1 Using the Linksys Voice System

SPA9000 Architecture

Architectural Components

Figure 1-6 SPA9000 Architecture

	SPA9000
Application	Administration
server	web server

SIP Proxy

SIP Registrar

Switch

Media (RTP) Proxy

Line 1

Line 2

Line 3

Line 4

(408)111-1000 to 7			ITSP SIP Proxy
		(408)111-1111
	SPA 400
		(408)111-1112
				PSTN
	SIP-PSTN	(408)111-1113
	gateway	(408)111-1114
(949)111-2000 to 7
			ITSP SIP Proxy
(888)111-3000 to 7
			ITSP SIP Proxy

FXS1

FXS2

aa

imusic

Call park

As shown in Figure 1-6, the SPA 9000 provides four logical line interfaces, referred to as Line 1, 2, 3, and 4. Each line can be configured with the same or a different ITSP. Each SPA400 also occupies one line interface. The SPA9000 has five internal clients that register implicitly with the internal SIP proxy:

•FXS1 (fxs1)

•FXS2 (fxs2)

•Call Park (callpark)

•Auto-Attendant (aa)

•Internal Music Server (imusic)

FXS1 and FXS2 correspond to the two physical FXS ports. The FXS ports can only register with the local SIP proxy. The Call Park is used to maintain calls that are parked, and AA is a scriptable auto-attendant application.

Table 1-1 Architectural Components

		Architectural Component	Function
		SIP proxy and Registrar server	Accepts registration from client stations and
			proxies SIP messages.
		Media proxy server	Proxies RTP packets between client stations and
			proxies SIP messages.
		Configuration server	Serves configuration files to client stations and
			auto configures un-provisioned client stations.
		Application server	Supports advanced features such as call
			park/pickup, directory, directed call pickup and
			group paging, hunt groups, and shared line
			appearances.
	Linksys SPA9000 Administrator Guide
1-12			Document Version 3.01