Configuring External Internet Telephony
Note: If no calls are possible via VoIP, although account registration
and perhaps even an initial call were successful, this might have
something to do with a very short timeout configured in the firewall.
Reduce the Interval for NAT Keep Alive for all of the providers used
(Réseaux publics > VoIP > Fournisseur > Configurer).
COMpact 5200/5200R/5500R - Firmware V7.4A - Advanced Information V08 06/2019
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