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Download SmartNode Series SmartWare Release 3.20 Software Configuration
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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 SmartNodes and IP network operate transparently. See figure 72 to visualize the VoIP leased-line connection. Leased Line VoIP Call H.323/SIP Interface H.323/SIP Interface FXO Device, always off-hook FXO Device, always off-hook IP Connectivity Routing Table FXS Interfaces Context CS Routing Table FXS Interfaces Context CS BRIDGE Service Node BRIDGE Service ETH 0/0 ETH 0/0 FXO Device – always off-hook Node FXO Device – always off-hook Figure 72. CS Bridge service—‘VoIP Leased Line’ diagram Now we will describe the technical details and logical structure to implement this application. From the perspective 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 Call router configuration task list 500
