5.2.2.3 Simple Remote ConnectionDescriptionUsing the Built-in Media Relay GatewayUsing the Built-in Media Relay Gateway feature, KX-NT500 series IP-PTs can be connected to a remotelocation without an additional device, such as an SBC (Session Border Controller). KX-NT500 series IP-PTscan be registered to the remote location after configuring the Built-in Media Relay Gateway. For theKX-NS1000, KX-UT-series SIP phones and general SIP phones can also be installed to the remote locationeasily. KX-UT SIP series phones and general SIP phones can be connected to the Built-in Media RelayGateway by following the method for using an SBC.Note• Peer-to-peer communication is not supported for the built-in media relay gateway.Using an SBC (Session Border Controller)KX-UT SIP phones and general SIP phones support simple remote connectivity when the KX-NS1000 isnetworked with an SBC (session border controller). Simple remote connectivity means that even if the SIPphone is located behind a NAT router, firewall, or both, specialised settings such as NAT traversal settings donot need to be configured for each remote extension.There are 2 scenarios for configuring and connecting a SIP phone:a. The SIP phone is connected and registered to the PBX on the PBX’s local network. The necessary settingsare configured automatically by the PBX.b. The remote IP settings of the SIP phone are configured without first connecting the phone to the PBX.Once programmed, the SIP phone is sent to the remote location, connected to the network and willautomatically connect to the PBX.Conditions• Extensions that will be configured remotely use HTTPS for transferring the configuration file. However, amaximum of 20 extensions per site can be connected in this way.• The following types of settings must be configured on the PBX:– The remote setting for the SIP phone’s port– The outside-facing IP address and port of the PBX-side network gateway– The necessary NAT traversal settings for the NAT device• The following types of setting must be configured on the PBX-side network gateway:When using an SBC (Session Border Controller)– Static port forwarding settings for traversing the SBC (SIP, TR-069, RTP, and NTP)When using the built-in Media Relay Gateway– Static port forwarding settings for traversing the built-in Media Relay Gateway (SIP, TR-069, RTP, NTP,PTAP, and MGCP)• General SIP phones must support early media.• SIP-CSs and S-PSs do not support this feature.[Automatic Rerouting to Secondary PBX]• For any group of remote extensions, the primary and secondary PBX connections must be kept between2 sites in a One-look network.464 Feature Guide5.2.2 SIP (Session Initiation Protocol) Extension
