Cisco 7905G Administrator's Manual page 68

Additional SIP Services
Table 4-2 Additional SIP Services (continued)
SIP Service Description
NAT/PAT To maintain Network Address Translation/Port
translation Address Translation (NAT/PAT) for a session, the
Cisco IP Phone can be configured to periodically send
a dummy UDP packet to a server (the phone does not
expect any response from the server).
To specify this configuration, use these parameters:
•
•
Network timing You can fine tune your network timing by making the
following settings:
•
•
•
•
Cisco IP Phone Models 7905G and 7912G Administrator Guide (SIP)
4-8
NatTimer—Bits 0 to 11 are for specifying the
retransmission period.
NatServer—Specifies the server to which the
dummy packet is sent.
Use the TimeZone parameter to specify the
time-stamp for incoming calls (offset from
Greenwich Mean Time).
Use the NTPIP parameter to specify the IP address
of the Network Time Protocol (NTP) server. NTP
is a protocol built on top of TCP that ensures
accurate local time-keeping with reference to radio
and atomic clocks located on the Internet.
Use the AltNTPIP parameter to specify an
alternate NTP server IP address.
Use the ConnectMode parameter to specify the
connection mode of the SIP protocol.
Chapter 4 Basic and Additional SIP Services
Reference
See the "SIP Parameters"
section on page
See the "Network
Parameters" section on
page 8-2 and the
Parameters" section on
page 8-24.
8-9.
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