LANCOM 1722 VoIP – LANCOM 1724 VoIP
Chapter 5: Configuring Voice over IP
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Target
Internal telephony at and between both locations.
External telephony via the SIP provider with backup over ISDN.
Calls to emergency and special numbers via ISDN.
Requirements
LANCOM connected to the LAN and WAN, an ISDN TE interface is linked
to the ISDN NTBA.
The Internet connection has been set up, as has the network connection
between both of the locations by means of a VPN tunnel. Any terminal
equipment that is connected can be reached with the IP addresses used.
A telephone number plan with a unique internal telephone number for all
terminal equipment to be connected. For each site, a separate number
range is used; in this example, the internal numbers for location A begin
with a '1' and the internal numbers for location B begin with a '2'.
Each site has a SIP provider account.
Internet
ISDN
LANCOM at location A
ISDN
ADSL
LAN
VoIP telephone
Internal number '11'
VoIP softphone
Internal number '12'
ISDN
VPN
VoIP telephone
Internal number '21'
VoIP softphone
Internal number '22'
LANCOM at location B
SIP provider