50 Remote Gateway 911x Series Installation and Administration GuidePlanning for installation Standard 3.0 One Network Address Translation (NAT) router supports only one RemoteGateway 911x series unit. One Port number and Network Address Translation (PNAT) router supportsmultiple Remote Gateway 911x series units. The RLC requires an IP address that the Remote Gateway 911x series unitcan access.Model 2: IP on-demandIf your BRI routers incur toll charges, configure an IP on-demand connection. TCP/IP signaling sessions between the RLC and the Remote Gateway 911xseries unit close when calls end. Configure a static IP address for the Remote Gateway 911x series unit onthe 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 Remote Gateway 911x series unit require IP addressesthat are accessible from the other unit.PSTN deploymentDeploy your Remote Gateway 911x series unit with PSTN only access if you arenot ready to implement VoIP at the remote location. The following guidelinesdescribe the requirements, conditions, and characteristics of each supportedPSTN deployment option:Model 3: PSTN permanentIf toll charges and B-channel usage at the host PBX are not an issue, configure aPSTN permanent connection. This deployment option provides the highestquality service. The PSTN link stays up after PBX calls are complete Configure PSTN # of remote on RLC Does not support call waiting even if cancel call waiting is entered on theRemote Gateway 911x series unit. Cancel call waiting only works for callsoriginated by the Remote Gateway 911x series unit, but calls can originatefrom the RLC after recovery from the PSTN network service outage
