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Voice over IP (VoIP)
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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.
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For direct SIP telephony using OpenCom 100, only SIP IDs consisting of
numbers for identifying subscribers registered with the SIP provider specified
can be addressed
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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 PBX Networking, under Configuration starting on
page 159).
You can configure SIP connections in the Configurator on the pages Telephony:
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.
9.4.2 Internal SIP Subscribers
The OpenCom 130 / 150 becomes available as the SIP server for internal SIP sub-
scriber telephony switching services. SIP telephones connected via LAN or SIP pro-
grammes installed on workstation computers can thus establish connections to all
other devices or trunks connected to the OpenCom 100. For operation as a SIP
server a MGW Interface Card is required.
Licence Assignment
The number of possible SIP subscribers is determined by the number of licences
purchased. In order to provide you with the greatest possible flexibility regarding
usage of available licences, licence assignment is dynamic via the "Floating
licence". Using a user/password combination ("SIP log on") you can have several
SIP subscribers under the same call number. Only every new SIP log-on occupies a
new licence. The technical log-on process of a SIP subscriber with a valid user
SIP Telephony
117
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