Voice over IP
1-13
• SIP PBXs
Maximum 4 connections to upstream SIP PBXs. These lines are
generally connections to large PBXs in the network at headquar-
ters which can be reached via a VPN connection.
The precise number of users and lines available varies between
models and software options.
1.4.3
VoIP characteristics of the Swyx VoIP Routers
1.4.3.1
Multiple ISDN/analog interfaces
The ISDN/analog interfaces of the Swyx VoIP Router can be
switched as internal or external connections and, depending on the
model, offer up to eight parallel voice channels. This allows, for
example, an existing PBX to be additionally equipped with SIP and
connected to an upstream VoIP PBX. Subscribers can simultaneously
make calls via ISDN and analog telephones, SIP equipment, or
softphones to other telephone subscribers, both internally and
externally. The transition between SIP and ISDN/analog is automatic
and invisible to the user.
1.4.3.2 Telephone even during a power cut
With life-line support and power relay to the internal ISDN port, it
remains possible to telephone over the conventional telephone
network even in case of a power outage. ISDN backup, load
balancing and VRRP in combination with Ethernet ports as WAN
interfaces provide SIP connections with redundancy and high
reliability. If a SIP remote station should fail, switching automatically
reverts to the conventional telephone network. This ensures that
telephony is just as reliable as ever, even with VoIP.
1.4.3.3 Point-to-multipoint and point-to-point connections with ISDN
For ISDN, Swyx VoIP Routers support point-to-multipoint and point-
to-point connections:
• Point-to-multipoint connection (point-to-multipoint): Up to 8
ISDN terminal devices can be connected to this type of
connection. Terminal equipment can include ISDN telephones
and ISDN PBXs, which can be used for connecting yet more
equipment. As an alternative, a Swyx VoIP Router can be
connected to a point-to-multipoint connection.
Summary of Contents for SwyxConnect 1722
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