Auerswald COMpact 5000R, Advanced Information

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Configuring Remote Extensions
COMpact 5000/R - Firmware V7.4A - Advanced Information V13 06/2019
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Configuring Remote Extensions
In order to operate a VoIP phone as a remote extension, it must either
be connected to the network via a VPN tunnel or the phone and the PBX
must establish the connection via a publicly accessible STUN server on
the Internet and a DynDNS service as described in the following.
Caution: Each port forwarding ares a security risk.
• You should use as few forwarding configurations as possible.
Important: As a protection measure against the access by third
parties, regularly check the call data recording of your PBX and the LOGs
of your NAT router for inconsistencies.
Important: For security reasons, the connection of remote extensions
by means of a VPN tunnel should be preferred.
Important: Note that when using a remote extension, emergency
calls can only be traced backed to the location of the PBX (localisation).
Localisation is necessary if the caller is no longer able to give his name
and address. Therefore, for emergency calls from a remote extension, a
mobile phone or a phone connected to the local VoIP or public switched
network is required.
Note: In order to avoid that emergency calls are made from a
remote extension, the prevention of emergency calls can be enabled
under Subscriber (scr.) > Properties > Exchange line settings. When
the subscriber tries to dial an emergency number, he will hear the