5.2.2.3 Simple Remote Connection
Description
KX-UT SIP phones and general SIP phones support simple remote connectivity when the KX-NS1000 is
networked with an SBC (session border controller). Simple remote connectivity means that even if the SIP
phone is located behind a NAT router, firewall, or both, specialised settings such as NAT traversal settings do
not 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 settings
are 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 will
automatically connect to the PBX.
Conditions
• Extensions that will be configured remotely use HTTPS for transferring the configuration file. However, a
maximum 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 at the remote location
• The following types of setting must be configured on the PBX-side network gateway:
– Static port forwarding settings for traversing the SBC (SIP, TR-069, RTP, and NTP)
• 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 between
2 sites in a One-look network.
Examples of allowed connections
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