Auerswald COMpact 5200 Advanced Information page 504

Settings – Réseaux publics
Voix sur IP (VoIP)
Disabled
Forces disabling of call data encryption by SRTP. The connection is not
established if the call partner (VoIP provider, other PBX in sub-system
operation or external VoIP subscriber) requires call data to be encrypted
using SRTP.
privilégié
Switches on negotiation for the encryption of call data by SRTP. When a call
is made, the call partner will be asked if encryption is possible. If so, the call
data will be encrypted and then transmitted, if not, the call data will not be
encrypted.
obligatoire
Forces enabling of call data encryption by SRTP. The connection is not
established if the call partner (VoIP provider, other PBX in sub-system
operation or external VoIP subscriber) does not require call data to be
encrypted using SRTP.
Note: SIPS should also be enabled at the same time, otherwise the key
for SRTP encryption would be readable.
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