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LANCOM 1722 VoIP – LANCOM 1724 VoIP
Chapter 5: Configuring Voice over IP
5.2.3
Using VoIP telephony to supplement existing ISDN telephones
This example shows how to configure a LANCOM when the ISDN telephones
used unit now are to be enhanced with VoIP telephony. The external MSNs
'555 555 1' and '555 555 2' on the ISDN bus at the NTBA were used for two
ISDN telephones until now. The LANCOM will now be switched between the
public ISDN connection and the internal ISDN bus connected to the ISDN tel-
ephones.
VoIP softphone
Internal number '14'
PCs in the LAN
ISDN telephones
Internal numbers '11' and '12'
Target
84
Router directs the call to the ISDN line with the MSN entered for this user,
'555 555 1'. The PBX receives the call to '555 555 1' on its external ISDN
bus and again determines that this is an external MSN and can channel
the call to the corresponding ISDN telephone.
VoIP telephone
Internal number '15'
LAN
LANCOM
Internal telephony with ISDN and SIP telephones and SIP softphones.
External telephony with ISDN and SIP terminal equipment over ISDN.
Accessing internal terminal equipment (ISDN and SIP) via the MSNs.
ADSL
ISDN
SIP provider with the follow-
ing account information
Domain: sipprovider.com
Telephone number: 0123-
456 789
Internet
ISDN connection
MSNs: 0123-555 555 1 to
0123-555 555 9
ISDN
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