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CS Context Overview
SN(sys)#ic voice 1
SN(ic-voice)[1]#pcm code E1
SN(ic-voice)[1]#pcm law-select aLaw
SN(ic-voice)[1]#exit
20.5 Configure Call Routing
Calls through a SmartNode can be routed according to a set of routing criteria. The entity that
manages call routing is called
Session Router
. Calls are routed from one CS interface to another
.
The
Session Router determines the destination interface for every incoming call. It supports complex call
routing and number manipulation functions. See Chapter 22, “Session Router Configuration”.
Call routing occurs in the context CS element between several CS interfaces. Accordingly a CS
context and two or more CS interfaces must be created. There are three types of CS interfaces: PSTN,
H.323 and ISoIP interface. The differences between the several interfaces are explained later.
As an example, Figure 20-3 shows a call set up from the A-party on the left to the B-party on the
right. The call is routed from the left-hand phone over the PSTN interface directly to an ISoIP
interface. Once it has passed the IP context and the IP Network, the other SmartNode—from the
ISoIP interface to the PSTN interface and then over the ISDN port to the B-party phone—routs the
call.
Figure 20-3: Direct Call Routing from one SmartNode to another
Because call routing occurs only in the CS context, in future Figures the IP context is omitted. For
configuring call routing you have to create the CS interfaces and the Session Router tables as
described in the chapters below. For simple call routing directly from one interface to another you
can even omit creating Session Router tables.
20.5.1 Create and Configure CS Interfaces
SmartWare currently supports one instance of the
CS context
. The name of this instance is ”switch”.
The name and number of
CS interfaces
depends on your own configuration. The interfaces on the
CS context represent logical connections to other equipment or networks. CS interfaces are used as
source and destination in the Session Router and are bound to physical ports or logical (SmartWare)
gateways.
Software Configuration Guide, Revision 1.03