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Cisco SPA500 Series and WIP310 IP Phone Administration Guide
68
Configuring SIP, SPCP, and NAT
The Cisco SPA500 Series and Wireless IP Phones use the following protocols:
•
Session Initiation Protocol (SIP)—SPA500 Series, WIP310
•
Cisco Smart Phone Control Protocol (SPCP)—SPA500 Series
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 68
•
Configuring SIP, page 71
•
Configuring SPCP on the SPA525G, page 90
•
Configuring SPCP on the SPA50XG, page 91
•
Network Address Translation (NAT) and Cisco IP Phones, page 91
Session Initiation Protocol and Cisco IP Phones
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
network.
Signaling
allows call information to be carried across network
boundaries.
Session management
controls the attributes of an end-to-end call.
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).
