Patton electronic SmartNode 4110 Series manual CS Bridge service-‘VoIP Leased Line’

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.

Leased Line VoIP Call

FXO Device,

always off-hook

FXS

Interfaces

Context CS

BRIDGE

Service

Node

FXO Device – always off-hook

H.323/SIP	H.323/SIP
Interface	Interface
	FXO Device,
	always off-hook
	IP Connectivity
Routing Table	Routing Table
	FXS
	Interfaces
	Context CS
	BRIDGE
	Service
ETH 0/0	Node
	ETH 0/0
	FXO Device – always off-hook

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

Call router configuration task list 511