NEC UNIVERGE SV9100 Features And Specifications page 693

15-05-47 and 15-05-48.
The SIP-ALG or similar SIP application function of all routers in the network must be
disabled.
The SV9100 Desktop Application does not support Network Address Translation (NAPT). If
a user would like to connect the Desktop Application through an Internet Connection the
use of a VPN is required.
If excessive packet loss occurs on the network, IP phones will play a warning tone during
conversations. To disable this tone set Program15-05-31 to "0".
Multicast RTP is not supported.
Peer to Peer is only possible on IP terminals within the same router.
After starting SIP negotiation for the call, if any RTP packet can't be received from the
terminal within 10 seconds, the call is dropped and the IP Terminal displays the following:
Each NAPT terminal can have a separate Register and Subscribe expire timer. The load of
the CPU will increase with each NAPT terminal using a short timer. Refer to NAPT
Terminals – Minimum Timer Settings to view the minimum timer settings based on the
number of NAPT terminals using Programs 15-05-47 and 15-05-48.
NAPT Terminals – Minimum Timer Settings
Program Number
15-05-47 (minimum setting)
15-05-48 (minimum setting)
Default Settings
None
System Availability
Terminals
DT800/DT700
Required Software
None
Number of DT800/DT700 Terminals Using Programs 15-05-47
and 15-05-48
1 ~ 144
(Terminals)
60 seconds
60 seconds
693
145 ~ 192 193 ~ 896
(Terminals) (Terminals)
90 seconds 180 seconds
90 seconds 180 seconds