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Cisco SIP IP Phone 7960 Administrator Guide
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Chapter 1 Product Overview
What is the Cisco SIP IP Phone 7960?
SIP Servers
SIP servers include:
•
Proxy server—The proxy server is an intermediate device that receives SIP
requests from a client and then forwards the requests on the client’s behalf.
Basically, proxy servers receive SIP messages and forward them to the next
SIP server in the network. Proxy servers can provide functions such as
authentication, authorization, network access control, routing, reliable request
retransmission, and security.
•
Redirect server—Receives SIP requests, strips out the address in the request,
checks its address tables for any other addresses that may be mapped to the
one in the request, and then returns the results of the address mapping to the
client. Basically, redirect servers provide the client with information about
the next hop or hops that a message should take and then the client contacts
the next hop server or UAS directly.
•
Registrar server—Processes requests from UACs for registration of their
current location. Registrar servers are often co-located with a redirect or
proxy server.
What is the Cisco SIP IP Phone 7960?
Cisco SIP IP phones 7960s (hereafter referred to as Cisco SIP IP phones) are
full-featured telephones that can be plugged directly into an IP network and used
very much like a standard private branch exchange (PBX) telephone. The Cisco
SIP IP phone is an IP telephony instrument that can be used in VoIP networks.
The Cisco SIP IP phone model terminals can attach to the existing in place data
network infrastructure, via 10BaseT/100BaseT interfaces on an Ethernet switch.
When used with a voice-capable Ethernet switch (one that understands Type of
Service [ToS] bits and can prioritize VoIP traffic), the phones eliminate the need
for a traditional proprietary telephone set and key system/PBX.
The Cisco SIP IP phone complies with RFC 2543.
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