Nortel M3820 Installation And Administration Manual page 66

Planning for installation
The RLC requires an IP address that the Digital Telephone IP Adapter unit
!
can access.
Model 2: IP on-demand
If your BRI routers incur toll charges, configure an IP on-demand connection.
TCP/IP signaling sessions between the RLC and the Digital Telephone IP
!
Adapter unit close when calls end.
Configure a static IP address for the Digital Telephone IP Adapter unit on
!
the RLC for best service.
IP on-demand configuration supports VPNs.
!
IP on-demand configuration does not support NAT or PNAT routers.
!
Both the RLC and Digital Telephone IP Adapter unit require IP addresses
!
that are accessible from the other unit.
66 Digital Telephone IP Adapter Installation and Administration Guide
Standard 2.1