Nortel Networks 1000 NAT Mapping Keep Alive

Features Page 163 of 910
IP Line Description, Installation and Maintenance
Do not change this port at any time. Map this port to port 5200 on the IP
Phones.
NAT Mapping Keep Alive
The normal operation of the LTPS and the IP Phone requires the LTPS to
send a periodic Watchdog Reset UNIStim message. This message resets the
hardware watchdog timer running on the IP Phone and specifies the period for
the time-out. If the LTPS does not send the Watchdog Reset message before
the watchdog timer expires, the IP Phone resets and begins a new registration
cycle with the LTPS.
Table 25
IP Line UDP Ports
UDP Port Device Use
5200-5262 Media Card RTP packets
(configurable starting port number –
IP Phone’s port matches it)
5201-5263 Media Card RTCP packets into Media Card
(port number is RTP port number + 1)
5200-5246 ITG-P 24-port line card RTP packets
(configurable starting port number –
IP Phone’s port matches it)
5201-5247 ITG-P 24-port line card RTCP packets into Media Card
(port number is RTP port number + 1)
5200 IP Phone RTP packets into IP Phone
(port matches first RTP port of the Voice
Gateway Media Card)
5201 IP Phone RTCP packets into IP Phone
(port matches first RTCP port of the Voice
Gateway Media Card)