NEC UNIVERGE SV9100 Manual page 84

84
The SIP server cannot be switched. (Only one address can be registered as the SIP server.)
SIP MLT NAPT Improvement for Registration Timers
Sometimes when a DT800/DT700 Terminal connects to the SV9100 via NAPT the intermediate router may
have a firewall function, if there is no communication for a defined period the router may close the port
used by the DT800/DT700. This will block the IP packets and the terminal will not function correctly.
A solution to this is to reduce the DT800/DT700 Registration and Subscription Expiry timers – however this
could then cause unnecessary network load if a large quantity of DT800/DT700 terminals are also
connected on the LAN since the same timers are used.
The Registration and Subscription timers for DT800/DT700 terminals connected via the LAN can be set to
a longer duration than those connected via NAPT.
Easy Edit – Advanced Items/VoIP/Extensions/DT800 DT700 Setup/DT800 DT700 NAT/DT800 DT700 NAT
Extension Plug and
180. A setting of 0 will disable the timer and a DT700 connected via NAPT will use the timer specified in 84-
23-01.
Easy Edit – Advanced Items/VoIP/Extensions/DT800 DT700 Setup/DT800 DT700 NAT/DT800 DT700 NAT
Extension Plug and
180. A setting of 0 will disable the timer and a DT700 connected via NAPT will use the timer specified in 84-
23-02.
NetLink Operation
When a NAPT DT800/DT700 is registered to a secondary system the timer of the primary system from
CMD 15-05-47 & 48 are used.
Timer setting and quantity of NAPT terminals
Since the network load will increase with the quantity of NAT terminals it is recommended that the following
minimum settings are used.
PRG Commands
Play/Registration Expire Timer for NAT (15-05-47)
Play/Sub scrib e Expire Timer for NAT (15-05-48)
Quantity of terminals / minimum timer setting
- (0, 60 – 65535 Seconds) default =
- (0, 60 – 65535 Seconds) default =