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Call router configuration task list 511
SmartWare Software Configuration Guide 40 • Call router configuration
CS Bridge service—‘VoIP Leased Line’
The circuit switch (CS) bridge service provides the functional ability to create a leased line between two FXS
ports, with the FXS ports on different SmartNodes. The call is point-to-point in an always connected state, also
known as nailed up. This Call Control service is called Bridge services.”
The application for this feature is when a constantly connected VoIP link is required between two FXS ports. It
is as if you connected a regular telephone that is always off-hook to the FXS port. However it is not identical
since the other end of the VoIP leased-line connection does not ring like in a PLAR application. There is no
end-to-end call setup so no call-progress tones are required nor needed.
Here is another way to describe the application. A user has an FXO port in two remote locations and wants to
connect these two locations over an IP network. Clearly the FXO port at a location must connect to an FXS
port. But since the network between the two sites is IP, there needs to be a mapping of the information on the
FXS–FXO link to a method of transporting the information over an IP network. Additionally, you do not
want any ringing to occur when the connection is made; you simply want it to be connected, so the Smart-
Nodes and IP network operate transparently. See figure 71 to visualize the VoIP leased-line connection.
Figure 71. CS Bridge service—‘VoIP Leased Line’ diagram
Now we will describe the technical details and logical structure to implement this application. From the per-
spective of just one SmartNode, the SmartNode makes two independent calls. These two calls are made from a
logical structure, called a Bridge Service. The Bridge Service has two interfaces, the listener port and the dialer
FXO Device,
always off-hook
IP Connectivity
Routing Table
H.323/SIP
Interface
FXS
Interfaces
Context CS
BRIDGE
Service
FXO Device – always off-hook FXO Device – always off-hook
ETH 0/0
FXO Device,
always off-hook
H.323/SIP
Interface
FXS
Interfaces
Context CS
BRIDGE
Service
ETH 0/0
Leased Line VoIP Call
Routing Table
Node
Node