SIP Telephony
Voice over IP (VoIP)
103
telephony. These products provide a “Full Cone NAT” setting for this appli-
cation.
●
To enable the use of multiple devices on a single Internet connection, the IP
addresses used in a LAN (often 192.168.x.x) are translated to a valid IP
address using address translation (NAT - Network Address Translation),
but no status information is available for NAT on an incoming RTP
connection. To avoid this problem, the IP address of a workstation
computer or telephone visible on the Internet is determined using a STUN
server (STUN: Simple Traversal of UDP over NAT). You can ask your SIP
provider for the STUN server’s IP address and port number. If you don’t
need a STUN server, leave the
SIP Provider
field empty.
●
For direct SIP telephony using Forum 523/524, only SIP IDs consisting of
numbers for identifying subscribers registered with the SIP provider spec-
ified can be addressed
●
You can integrate an external SIP connection in the
Telephony
:
Trunks
:
Route
menu into the route configuration. You can use a network provider
rule to specify the routing of numbers within a specific range to use SIP
telephony as a preference (see also
You can configure SIP connections in the
Configurator
on the pages
Tele-
phony
:
Trunks
:
SIP provider
and
Telephony
:
Trunks
:
SIP trunks
. Enter the
technical attributes of a specific SIP provider, such as the IP addresses for the
registrar and the STUN server under
SIP provider
. Under
SIP trunks
enter the
information for an existing SIP account, such as the user name, password,
assigned call number and the maximum number of simultaneous calls
possible.
For extension-capable SIP-DDI lines, you can, as needed, make additional
settings on the
Telephony
:
Trunks
:
SIP Provider
page. Assigning extension
call numbers and internal subscribers is configured on the pages under
Tele-
phony
:
Call Distribution
(
Incoming DDI
or
Outgoing DDI
). Please note the
explanations on these pages in the online help. Furthermore, assigning exten-
sions using placeholders (“wildcards”) is possible. The online help offers an
explanation under the keyword
Call Number Mapping
.