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

CIS (Russian) Signaling Types

Telesis Systems Offering CIS 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


Telesis systems support the following types of signaling for Russian (and CIS) PSTN:

  • Two-bit channel-associated signaling
  • Single-bit channel-associated signaling
  • Two-wire / four-wire analog signaling
  • Single-frequency (1VF) signaling
  • Multifrequency Signaling

CIS signaling E1 and EM interfaces in Telesis systems

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

Trunk types within Telesis systems are local trunks, toll-connecting trunks, and toll-switched trunks for CIS-Russian PSTN. For all such trunk types, both two-bit and single-bit channel-associated signaling types are applicable when the interface is E1. If the interface is analog, then analog mapping of the single-bit channel-associated signaling type is applicable. For local (SL, CL) and toll-connecting (ZSL, OCL) trunks, available address- and register-signaling options are:

  • Pulse
  • Multifrequency shuttle (MFC R1.5)
  • Multifrequency packet (1, 2, 3a, 3b)

For toll-switched trunks (SLM, TCL), available address- and register-signaling options are:

  • Pulse
  • Multifrequency packet (3a, 3b)

In addition, line signals can be transmitted/received as voice frequencies. Telesis X1 Switching Systems also provide 1VF signaling for local, toll-connecting, and toll-switched trunks.


The digital interface for two-bit and single-bit CAS is E1. 120 ohm balanced terminations are supported on any E1. The line code is HDB3 or AMI programmable. CRC4 may be enabled or disabled.

The analog interfaces for local, toll-connecting, and toll-switched trunks are:

  • Two-wire/four-wire Type V analog E&M

The following options and parameters are available in CIS-Russian signaling interfaces of Telesis systems:

  • Automatic calling-party category translation for calls routed into and out of the CIS signaling system
  • ANI generation (request)
  • ANI response
  • Programmable calling-party categories
  • Several signaling periods and timers for signal generation and detection
  • Both unilateral and bilateral call clearing

For single-bit CAS line signaling in the E1, the idle state of the A,B,C, and D bits can be set as desired. The signaling bit is also programmable as any of A,B,C, or D. The transmit and receive gains in any E1 voice channel may be increased or decreased.

Route, Routeset Configuration, Routing

In a Telesis system, each E1 channel may have its own route number. It is possible to define up to 128 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 on calls coming from CIS interfaces according to:

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

Related Readings

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


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