Auerswald COMpact 4000 Operation Manual page 771

Glossary
Terminology
S
SIP Port
The SIP port is entered as the port of the local system which has to be used as the communi-
cation port for the SIP transfer.
SMTP Server
The SMTP network protocol is used for the secure transfer of e-mails between the PBX and
external mail servers. The PBX needs an external SMTP server to send system e-mails or
forward voice mail messages and fax messages.
Under Administration > E-mail > Outgoing mail server you can enter different outgoing mail
servers. If no outgoing mail server has been entered, no e-mails can be sent.
STUN
Using STUN (Simple Transversal of UDP over NATs), the public IP address of an Internet
connection can be determined. To do this, a STUN request is sent to a STUN server, which
then shares its own IP address allocated by the VoIP provider with the Internet connection.
Subnet mask
Configuring subnetworks makes it possible to connect many totally different networks located
in totally different areas because each subnetwork receives its own address and can therefore
be addressed by the router. A subnetwork is created when the IP address is linked with a
subnet mask:
If a bit in the subnet mask is set, the corresponding bit in the IP address is considered a part of
the network address. If a bit is not set in the subnet mask, the corresponding bit in the IP
address is used as a part of the PC address.
The value of the subnet mask, as with IP addresses, is often given in decimal form (for
example, 255.255.255.0 for IPv4 addresses).
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COMpact 4000 - Firmware V6.6A - Installation, Operation and Configuration V03 03/2016