Telesis PX24 IP PBX Business Phone System
Design and manufacture IP PBX Business Phone System, Switching System, VoIP Gateway, and Signaling Converter  

R2 Signaling

Telesis Systems Offering R2 Signaling

  • Telesis Business Phone Systems:
    • PX24M Hybrid IP PBX Business Phone System 
    • PX24X Hybrid IP PBX Business Phone System
  • Telesis Switching Systems:
    • X1 Large Capacity TDM - IP Telephony Switch
  • Combined VoIP Gateway and Signaling Converters:
    • Stillink 200
    • Stillink 800
    • Stillink 3200

Standards and interfaces

Telesis PX24X, X1 and Stillink support signaling for two-bit R2 line / MFCR2 interregister according to ITU-T recommendations. Telesis PX24M, PX24X and X1 switching systems support signaling for MFCR2 interregister on analog Type-V E&M interfaces.

R2 signaling E1 and EM interfaces in Telesis systems

Telesis systems have R2 signaling E1 and E&M interfaces to connect to PSTN and private network


The physical interface for single-bit and two-bit signaling is an E1 (ITU-T G.703). 120 ohm balanced terminations are supported on any E1. The line code is HDB3 or AMI programmable. CRC4 may be enabled or disabled. Each E1 channel can be programmed as incoming, outgoing, bothway trunk, or unavailable.

Each analog E&M trunk board has four line circuits that satisfy the conditions for Type-V connections. Each port may individually be set to either a two- or four-wire interface with appropriate configuration of the on-the-board jumpers. An additional detector on the M-wire checks the DC feed on the line to detect faulty conditions in far-end equipment. The analog E&M trunk card is available for 600 ohm resistive reference impedence. Each E&M port can be programmed as incoming, outgoing, bothway trunk, or unavailable.

The following options and parameters are available on R2 signaling interfaces of Telesis systems:

  • Automatic calling-party category translation for calls routed into and out of the R2 signaling system
  • ANI (asking and replying to calling-party number request)
  • Programmable calling-party categories

Route and Routeset Configuration

In a Telesis system, each E&M interface and E1 channel may have its own route number. It is possible to define numerous distinct routes. A given route to a particular destination and its accompanying routes are grouped in a routeset. Each route in a routeset has a priority order. Routing to the next priority alternate route is possible in the event that a route becomes unavailable.


A Telesis system may realize routing according to:

  • Dialed digits
  • Calling-party number
  • Category of calling party

Related Readings

We recommend you to visit Telesis WiKi Pages for technical readings.


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