Linksys WIP310 Cisco SPA9000 Voice System Administration Guide - Page 50
Configuring Your System for ITSP Interoperability,
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Configuring Your System for ITSP Interoperability About the SPA9000 Voice System and SIP 3 Figure 1 SIP Requests and Responses for Internal Calls SIP UA 2 4 SIP Proxy RTP 3 1 SIP Proxy SIP Proxy SIP UA Likewise, SIP requests and responses are exchanged to support outbound and inbound calls that are handled through the ITSP service. In Figure 2, "SPA9000 as a SIP Proxy for Internet Calls," UserA and UserB are client stations that are registered to the SPA9000. When UserA calls UserC, the SPA9000 directs the request to the SIP proxy at the ITSP, which is then responsible for routing the request to UserC. After the session is established, RTP is anchored by the SPA9000. Figure 2 SPA9000 as a SIP Proxy for Internet Calls UserC UserA UserB Hub/switch IP Router (firewall) Broadband modem ISP Internet (WAN) Interface SPA9000 SIP Proxy with media proxy enabled SPA9000 Voice System Administration Guide Internet ITSP 48