Sip Clients - Cisco 7960 Administrator's Manual

What is Session Initiation Protocol?
Figure 1-1 SIP Architecture
SIP User
Agents (UA)

SIP Clients

SIP clients include:
Cisco SIP IP Phone 7960 Administrator Guide
1-4
SIP Proxy and
Redirect Servers
SIP
SIP
RTP
IP
Phones—Can act as either a UAS or UAC. Softphones (PCs that have phone
•
capabilities installed) and Cisco SIP IP phones can initiate SIP requests and
respond to requests.
Gateways—Provide call control. Gateways provide many services, the most
•
common being a translation function between SIP conferencing endpoints
and other terminal types. This function includes translation between
transmission formats and between communications procedures. In addition,
the gateway also translates between audio and video codecs and performs call
setup and clearing on both the LAN side and the switched-circuit network
side.
SIP
SIP Gateway
Legacy PBX
Chapter 1 Product Overview
PSTN
78-10497-02