LANCOM 1722 VoIP – LANCOM 1724 VoIP
Chapter 1: Introduction
33
EN
be reached using local numbers, even if a SIP PBX connected via VPN can
be reached in Manchester.
Depending on the settings for automatic outside line access (’Auto-
matic outside line access’
→
page 29), a "0" prefix may be required.
The
national and international numbers
behave in the same way as
local numbers; here, the physical location of the devices is decisive for the
assignment of corresponding access codes. Therefore, a LANCOM VoIP
Router in Austria belongs to the national telephone network in Austria,
even if there is a VPN connection to the SIP PBX at the headquarters in
Germany.
Depending on the settings for automatic outside line access (’Auto-
matic outside line access’
→
page 29), a "0" prefix may be required.
Special numbers
Certain special numbers (emergency numbers, toll-free or particularly expen-
sive service numbers) can be subjected to special treatment by the call router.
For example, this ensures that emergency numbers for the police or fire
department are always secured, even if the subscribers do not dial the
correct preceding dialing signal for outside line access.
With the standard settings, the emergency numbers "110" and "112" are
configured in such a way that they can be dialed correctly with or without
the preceding "0".
For toll-free numbers such as "0800", a direct connection via ISDN is usu-
ally selected in order to use the toll-free land-line to land-line connection.
Dialing using specific lines
With the LANCOM VoIP Router, other lines, in addition to the previously exist-
ing ISDN exchange lines, can be defined for voice communication, i.e. to a SIP
PBX connected via VPN or to a public SIP provider via the Internet. Each time
a connection is established, the call router decides which of the existing lines
is to be used for the call based on pre-determined rules.
As an alternative to the automatic selection by the call router, you can direct
individual calls to a certain line, for example when you want to call a party
purposely via ISDN and not via the SIP PBX at the headquarters. For this pur-
pose, the call router assigns specific code numbers to existing lines, such as
