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Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)
OL-4277-01
Chapter 1 Overview of the Cisco IP Phone Models 7905G and 7912G
SIP Overview
Figure 1-2 SIP Architecture
Related Topic
• SIP Functions, page 1-7
• SIP Clients, page 1-9
• SIP Servers, page 1-10
SIP Clients
SIP clients include the following:
• Telephones—Act as either UAS or UAC. The Cisco IP Phone models 7905G
and 7912G can initiate SIP requests and respond to requests.
• Gateways—Provide call control. Gateways provide many services, the most
common being translation between SIP conferencing endpoints of
transmission format, communications procedures, and codecs. Other
functions include call setup and clearing on both the LAN side and the
switched-circuit network side.
P
user agents
RTP
SIP
SIP proxy and
redirect servers
SIP gateway
PSTN
Legacy PBX
SIP SIP
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