TD 92326GB
2009-03-10 / Ver. E
Installation and Operation Manual
VoIP Gateway
1
1
Introduction
The VoIP Gateway is the gateway for ISDN primary rate interfaces (PRI) in the Ascom
VoWiFi and IP-DECT system. It serves as a link between traditional telephony and IP
telephony.
Figure 1. VoIP Gateway connected via trunk lines to a PBX.
The VoIP Gateway has four PRI interfaces and can be used with several different
configurations. Two PRI interfaces may be switched to ISDN or to cascade redundant
systems, see
on page 127. The additional two PRI interfaces may
then provide PRI access to further devices.
Multiple VoIP Gateways can be used to load balance calls to and from the PBX.
The PRI interfaces can be configured to relay the PRI connections even with the power
supply shut down.
The VoIP Gateway supports up to 2 E1 (up to 60 channels with EDSS1, QSIG, E1-CAS
protocol), or up to 2 T1 (up to 46 channels with QSIG-, 5ESS- or NI-2-protocol or up to 48
channels with T1-CAS protocol). If the channels provided by one box is not sufficient,
several VoIP Gateways may be interconnected. The additional PRI interfaces will then be
administered centrally and used as if provided by just one device. Furthermore, the VoIP
Gateway is prepared with the option to increase its internal memory by installing a
“Compact Flash” Type 1 memory card, which will be available in the future.
The VoIP Gateway has two separate Ethernet interfaces. They can be individually
addressed and may take over routing functions between two networks. For network
switches with a redundant security design, the second Ethernet interface may also be used
for the connection with the second switch. The second interface may also be used as
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