LANCOM 1722 VoIP – LANCOM 1723 VoIP – LANCOM 1724 VoIP – LANCOM 1823 VoIP
Chapter 1: Introduction
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1.4.2
The central position of the LANCOM VoIP Router
LANCOM VoIP Router take up a central position in the switching of telephone
calls between internal and external subscribers over the different channels of
communication. Depending on the model and equipment, the devices inter-
connect the following communication participants and channels into a com-
mon telephone infrastructure.
Internal VoIP terminal devices connected to LAN, WLAN and DMZ, such
as SIP telephones and SIP softphones
The internal telephone infrastructure with ISDN or analog PBX and ISDN
and analog telephones
Analog terminal devices, internally connected either into the ISDN net-
work via a PBX with a/b ports, or alternatively into the VoIP network over
an ATA (Analog Telephone Adapter)
External SIP providers and all of the external subscribers attainable via
them
Upstream SIP PBXs with all of the internal and external subscribers attain-
able through it
The external telephone world via an exchange line or upstream PBX, and
all of the external subscribers available via the land-line network
VoIP Router
Analog FAX
PSTN
ISDN Phone
ISDN
VoIP Router
INTERNET
Analog Phone
POTS
PC / Softphone
SIP Phone
Analog PBX
ISDN PBX
PC / Softphone
PC / Softphone
SIP Phone
Example: Sites with ISDN or analog lines
