Chapter 3: Configuring Your System For Itsp Interoperability; About The Spa9000 Voice System And Sip - Cisco Small Business Pro SPA9000 Administration Manual

Configuring Your System for ITSP
Interoperability

About the SPA9000 Voice System and SIP

SPA9000 Voice System Administration Guide
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This chapter provides configuration details to help you to ensure that your
infrastructure properly supports voice services.
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"About the SPA9000 Voice System and SIP," on page 47
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"Network Address Translation (NAT) and Voice over IP (VoIP)," on page 49
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"Firewalls and SIP," on page 54
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"Configuring SIP Timer Values," on page 55
The SPA9000 Voice System is implemented using open standards, such as
Session Initiation Protocol (SIP), to help ensure interoperability with all ITSPs that
support SIP. This section provides information about the SIP requests and the
settings that you may need to adjust on your network or your SPA9000 to help
ensure interoperability.
The VoIP telephone service is coordinated by SIP requests and responses,
whether the calls are internal or external.
for Internal Calls," on page 48
client stations in the SPA9000 Voice System. The SPA9000 acts as a SIP proxy
and establishes a session. After the session is established, Real Time Protocol
(RTP) traffic flows directly between the two client stations.
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Figure1, "SIP Requests and Responses
illustrates the SIP requests and responses between
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