Auerswald COMmander 6000 Advanced Information page 491

Pbx for internet/isdn telephony

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NAT traversal

NAT (Network Address Translation) enables you to convert a particular IP

address that is used within a network (e.g. a local network) into a different

IP address that can be used by a different network (e.g. the public switched

phone network). If NAT traversal is switched on, and a query is sent from a

local IP address to the public network, the sending IP address is swapped

with the public IP address. This function is performed in the reverse direction

for the reply.

NAT traversal is not performed by the PBX. The router which connects the

local area network with the Internet should be a properly functioning, SIP-

aware router which performs NAT traversal.

Enabled with use of STUN

NAT traversal is performed by the PBX. To achieve this, a STUN server

must also be specified for the VoIP provider.

NAT traversal is performed by the PBX. To achieve this, the registrar for the

VoIP provider must be switched on. The SIP request also contains an "rport"

part in which the IP addresses used here (local, public) are transported.

If Enabled is selected: If problems occur with single-sided call connec-

tions, use Enabled with use of STUN instead.

COMmander 6000/R/RX - Firmware V7.0D - Advanced Information V19 04/2018

Settings – Public switched tel. networks

Voice over IP (VoIP)

Commander 6000r