Page 88
VoIP gateway IP400 version 5.01
Fig. 23 on page 88 shows a scenario in which calls are switched via VoIP between
a telephone connected to gateway A and the ISDN network connected to gateway
B.
Fig. 23 Routes via 2 gateways
The type of call is of no relevance to call switching. In principle, any call can be
forwarded to any given interface. For instance:
• For a call from your telephone, via your network provider's fixed network, the
call is switched from the gateway's ISDN-interface, where your ISDN-tele-
phone is connected, to the ISDN-interface to which the corresponding
exchange line is connected.
• For a call from a remote gateway to your ISDN-telephone, an incoming call
on a VoIP interface of the gateway is put through to the ISDN-interface to
which your ISDN-telephone is connected.
tel1
GW1
VoIP
Telephone
Route 2: GW1>>tel1
Route 1: tel1>>GW1
Gateway A
PPP
GW1
ISDN
VoIP
Route 2: PPP>>GW1
Route 1: GW1>>PPP
Gateway B