Auerswald COMpact 5200 Advanced Information page 497

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.
Disabled
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.
Enabled
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.
Notes:
If Enabled is selected: If problems occur with single-sided call connec-
tions, use Enabled with use of STUN instead.
Caution: Each time a port is opened on the NAT router, this
creates a potential source of danger.
COMpact 5200/5200R/5500R - Firmware V7.2 - Advanced Information V04 07/2018
• It is essential you put additional protective measures in
place.
Settings – Réseaux publics
Voix sur IP (VoIP)
497