Auerswald COMpact 5200 Advanced Information page 496

Settings – Réseaux publics
Voix sur IP (VoIP)
the test phase, you can enter a much higher value, since some VoIP
providers also reject calls if too many attempts are made to register.
Enregistrement SIP conformément à RFC 6140

The PBX complies with the SIPconnect 1.1 SIP protocol.
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
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COMpact 5200/5200R/5500R - Firmware V7.2 - Advanced Information V04 07/2018