Auerswald COMpact 4000 Operation Manual page 595

Interval for NAT Keep-Alive
After the time specified here has passed, NAT Keep-Alive packets are sent to the Firewall to
maintain the NAT mapping.
Note: Some VoIP providers block accounts if the Interval for NAT Keep-
Alive is too short. As a rule, this is reported with error message 503 during
SIP registration. If you encounter this problem, we recommend you set a
higher value (e.g. 180).
Outbound proxy
The outbound proxy is an intermediate server that processes all VoIP requests and connec-
tions going to the provider (except for registration).
automatically: The PBX automatically determines an outbound proxy.
Manual Port
an IP address or a URL.
Note: The Overviews > Ports page shows an overview of the PBX ports
(incoming and outgoing).
SIP port (1 to 65535)
The SIP port on the PBX is used both as an incoming port and an outgoing port (i.e. for commu-
nications with the VoIP provider).
Notes:
A different SIP port must be used for each VoIP provider.
The SIP port for a VoIP provider cannot be the same as the SIP port of the
internal VoIP registrar or the SIPS port of the internal VoIP registrar.
The Overviews > Ports page shows an overview of the PBX ports (incoming
and outgoing).
COMpact 4000 - Firmware V6.6A - Installation, Operation and Configuration V03 03/2016
Caution: Each time a port is opened on the NAT router, this creates
a potential source of danger.
• It is essential you put additional protective measures in place.
enabled
: The outbound proxy is a fixed default setting. Enter this data as
Settings
VoIP
VoIP Provider Settings
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