Chapter 5: Configuring Sip, Spcp, And Nat; Session Initiation Protocol And Cisco Ip Phones - Cisco SPA942 - - IP Phone Administration Manual

Configuring SIP, SPCP, and NAT

Session Initiation Protocol and Cisco IP Phones

Cisco SPA and Wireless IP Phone Administration Guide
The SPA and Wireless IP Phones use the following protocols:
• Session Initiation Protocol (SIP)—SPA9X2, WIP310, SPA525G
• Cisco Smart Phone Control Protocol (SPCP)—SPA525G only
This chapter describes how to configure the phone protocols and other
parameters. It contains the following sections:
• Session Initiation Protocol and Cisco IP Phones, page 87
• Configuring SIP, page 89
• Configuring SPCP on the SPA525G, page 109
• Network Address Translation (NAT) and Cisco IP Phones, page 109
Cisco IP phones use Session Initiation Protocol (SIP), allowing interoperation with
all ITSPs supporting SIP.
SIP handles signaling and session management within a packet telephony
Signaling
network. allows call information to be carried across network
boundaries. Session management
The following diagram shows a SIP request for connection to another subscriber
in the network.
In typical commercial IP telephony deployments, all calls go through a SIP proxy
server. The requesting phone is called the SIP user agent server (UAS), while the
receiving phone is called the user agent client (UAC).
controls the attributes of an end-to-end call.
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