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Using the information during configuration
Telephone number plans with ISDN PBX systems.
When crossing from the ISDN network to the internal subscribers, the ISDN PBX converts the
external MSNs to internal MSNs. When operating a LANCOM VoIP Router at the extension
interface of the ISDN PBX, there is another conversion of the internal MSNs to the internal
numbers of the VoIP range. For reasons of clarity, we recommend using congruent internal
MSNs/numbers for terminal equipment for all connections.
The following table provides a summary of the information required for con-
figuration and where it can be entered. SIP terminal equipment parameters
can be entered using the SIP telephone keypad, the corresponding configura-
tion software, or the softphone configuration menu.
Internal VoIP domain
Internal numbers
External SIP telephone number
SIP account access information
External ISDN telephone num-
bers (MSNs)
Country and local area code
Configuring the LANCOM
When configuring the LANCOM, the following steps must be carried out:
Detailed instructions on configuring the LANCOM:
LANCOM
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Setting up the line to the SIP provider
Enabling the ISDN interface and assigning MSNs to the internal numbers
in the LANCOM VoIP Router
Creating ISDN users
Adapting the call routing table
LANCOM 1722 VoIP – LANCOM 1724 VoIP
Chapter 5: Configuring Voice over IP
SIP terminal
ISDN PBX
equipment
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✔
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ISDN termi-
nal equip-
ment
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