Swyx SwyxConnect 1722, User Manual

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1-6 Voice over IP
Telephone calls over the PBX and the telephones connected to it
remain possible just as before; the telephones remain available under
the familiar telephone numbers. This application additionally offers
the following options:
• In addition to the ISDN and analog telephones, VoIP telephones
or VoIP softphones can be included in the telephone
infrastructure.
• VoIP subscribers in the internal LAN are also able to call
external PSTN subscribers.
• The ISDN and analog telephones continue to function, and
additionally they can call all of the internal VoIP telephones
and softphones in the LAN.
• Calls to external SIP subscribers who use the same Internet
provider are often available at no cost.
• With the appropriate connection to a public SIP provider, any
other SIP subscriber worldwide can be called, irrespective of the
provider network. As an alternative to a direct telephone
connection, public telephone network subscribers can also be
reached over a diversion via the SIP provider. The costs depend
on the provider's particular tariff models. Frequently, long-
distance and overseas calls via an SIP provider are significantly
cheaper than the traditional telephone connection.
In this constellation, the Swyx VoIP Router takes over the switching
of the calls. The device can be individually configured, for example,
ISDN PBX
Swyx VoIP Router bet-
ween NTBA and PBX
Internet
Example: ISDN PBX
ISDN telephones
VoIP telephone VoIP softphone
ISDN net-
work subscri-
bers
Public SIP provider
ISDN NTBA
Analog fax
machines and
telephones PSTN