NEC UNIVERGE NEAX 2000 IPS Reference Manual page 247

Chapter 13 Voice Over IP (VoIP)
Connections to Legacy Stations and Trunks
The IP station can communicate with legacy stations and trunks (including H.323 trunks) via IP-PAD
that converts voice packet data to PCM signals. Call control signals are transmitted to MP over the
LAN, while voice packets are transmitted via IP-PAD. The number of IP-PADs depends on the traffic
volume of connections between the IP station and legacy stations and trunks.
Remote Connections of IP Stations
The IP stations can be located at remote sites over an intranet/internet/PSTN/ISDN via routers. IP
stations can be installed behind routers that are configured to use NAT (Network Address Translation)
at the remote location. This allows IP station users at remote sites to use the 2000
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IPS features as same as those at local site. The number portability among the sites is available, so that
the same IP station user can login at any site, using the single login code and password. The IP station
has two operating modes: Local Connection Mode and Remote Connection Mode. Each operating
mode can have individual VoIP communication parameters such as CODEC selection list and usable
bandwidth, so that the appropriate communication is available even if the IP station user logs in at
either local site or remote site.
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