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How Call Routing Works

In the Sonus SBC 1000/2000 system

 (SBC), all call routing occurs between Signaling Groups.


In order to route any call to or from a call system connected to Sonus SBC 1000/2000, you must first configure a Signaling Group to represent that device or system. The following list illustrates the hierarchical relationships of the various Telephony routing components of a Sonus SBC 1000/2000 call system:

Signaling Group — describes the source call and points to a routing definition known as a Call Route Table
  → Call Route Table — contains one or more Call Route Entries
         → Call Route Entries → points to the destination Signaling Group(s)


The diagram below illustrates possible paths of a call from an external call from a ISDN PRI service line connected to the Sonus SBC 1000/2000 system to an internal Lync 2010 server or analog phone or fax devices connected to a Tenor Analog device.

1Logic Path





Call Logic Steps

  1. An outside call comes through the ISDN PRI line connected to the Sonus SBC 1000/2000 system and is routed to the ISDN Signaling Group.

  2. In order to route the call, the Sonus SBC 1000/2000 ISDN Signaling Group system engages the Call Route Table attached to it.

  3. Sonus SBC 1000/2000 processes the Call Route Table entries and their attached Transformation Table entries, looking for a match to the called number.
    1. Sonus SBC 1000/2000 finds a match for a 4xxx local extension managed by a Lync 2010 Server.
    2. Sonus SBC 1000/2000 finds a match for a x2001 or x2002 local extension analog device, managed by a Tenor Analog system.

  4. Sonus SBC 1000/2000 routes the call to the appropriate Signaling Group and the receiving system processes the call.


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