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Chapter 1: Overview
Data Network Calls
Calls coming from the data network can be routed to the Line circuit or Trunk circuit spans. The Tenor CMS
will route calls based upon the dialed number. If the number is configured as a local phone number, the call
will be sent to a Line circuit for termination, otherwise the call is considered a “Hop-Off call” and the Tenor
CMS sends it out through a Trunk circuit span, typically connected to the PSTN.
Figure 1-5
Data Network Call Routing
Other Call Routing Options
There are several routing tables you can configure via the Command Line Interface (CLI) to adjust how the
Tenor CMS unit routes specific calls. For example, you may want to configure 911 as a “bypass number”,
which means that all 911 calls coming into Tenor CMS from the line circuit will be routed directly to a Trunk
circuit presumably connected to a PSTN. Bypass calls are never routed over IP.
There are four types of routing databases you can configure: Bypass Directory Numbers (BPN), Local Direc-
tory Numbers (LDN), Hop-Off Directory Numbers (HDN) and Static Route. Bypass Directory Numbers are
directly routed from a Line circuit to a Trunk circuit. Local Directory Numbers are phone numbers that are
reachable through local Line Circuits. Hop-Off Directory Numbers are phone numbers that can be routed over
the IP to another Tenor location and then out to the Trunk circuit, possibly to the PSTN as a local call. Static
Routes are used between networks and other H.323 devices that are not registered to the network through the
Border Element (such as non-Quintum gateways).
Virtual Tie Line
Tenor CMS can emulate a tie trunk. It provides all of the functionality of a tie trunk, including the consider-
able cost savings, but eliminates the need for a PBX trunk to be configured, or marked as a tie trunk. A tradi-
tional tie trunk is a PBX-configured direct connection between two PBXs in separate locations. The tie trunk
bypasses the PSTN network.
Your PBX does not need any additional configuration. Tenor CMS treats all the trunks the same without com-
promising voice quality.
Line
Circuits
Ethernet
PSTN B
Trunk
Circuits
Trunk
Circuits
PSTN A
Ethernet
(IP Network)
Tenor CMS
PBX
VOIP Call
Circuit
Call
Circuit
Call
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