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

Automatic Conversation Recording on TDM Ports

Telesis Systems Offering Coversation Recording on TDM Ports 

  • Telesis Business Phone Systems:
    • PX24N (Telesis Nano) IP PBX SoHo System
    • 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
  • Large Capacity IP PBX for Enterprises:
    • Stillink 3200


Telesis systems allow Automatic Conversation Recording applications with much of ease. All conversations on pre-selected TDM ports may be automatically recorded. Unlike other external recording products, Telesis solution is:

  • fully integrated with the Telesis System
  • cost-effective
  • easily maintained
  • capable of bi-directional, echo-free, high-quality voice recording
  • capable of archiving compressed or uncompressed voice records 
  • with freeware downloading, archiving, indexing, and reporting utility XTools
  • with the possibility of uploading records via FTP
  • with the possibility of authorized remote access over IP
  • with the possibility of re-selecting ports (to be recorded) easily with programming only

Recordable TDM Ports

  • Analog subscriber interfaces (i.e., FXS ports)
  • Telesis 4B+D ISDN interfaces (digital subscriber interfaces)
  • Basic Rate ISDN S0 ports
  • Basic Rate ISDN T0 ports
  • Analog DC loop trunks (i.e., FXO ports)
  • Analog RDTT ring down tie-trunks (local battery ports)
  • Analog E&M trunks
  • 2.048 Mbit E1 interfaces with the following signaling types:
    • Channel-Associated Signaling (CAS)
      • Single-bit E&M emulation
      • Two-bit ITU-T R1
      • Two-bit ITU-T R2
      • Many variations of signaling types (such as CL-1B, OCL-1B, TCL-1B, CL-1VF, OCL-1VF, TCL-1VF, SL/ZSL, SLM) widely employed in CIS countries
    • Common-Channel Signaling (CCS)
      • DSS1 (Euro-ISDN in the TE direction)
      • DSS1 (Euro-ISDN in the NT direction)
      • ECMA QSIG (in the TE direction)
      • ECMA QSIG (in the NT direction)
      • ITU-T Signaling System No.7 ISUP


Automatic voice recording of all calls (conversations) is critical to some operations and applications such as;

  • Public Safety and Health
  • Call Centers
  • Air, Maritime, Railway Traffic Control

The integrated DVR (digital voice recorder) within Telesis systems may be used in such operations and applications for bi-directional (both calling and called party voices) recording.

Archiving, Indexing, and Reporting Conversation Records

The combination of the integrated DVR hardware (with a storage capacity of 100 hours or more) and an external archiving device is the heart of the solution. In this solution, the integrated DVR operates as the recording buffer. To transfer conversation records to the archiving device, two protocols are availabe:

XTools Protocol

Telesis system acts as a server and listens requests on a predefined UDP port. The client is a PC running the freeware XTools Utility. The XTools Utility collects and archives the conversation records. Indexing and reporting functions may also be handled by the XTools Utility.  

Donwnlading voice records with using XTools Protocol

Freeware XTools Utility may collect conversation records from the Telesis system 

FTP Protocol

Telesis system acts as a client and periodically tries to connect to an FTP server to transfer recordings in compressed or uncompressed format. In case of compression (for Telesis systems licensed with VoIP codecs), the codec to be used for decompression is VivoActive G.723.1. Otherwise, i.e., uncompressed transmission, the A-Law codec is used. The archiving device can be any FTP server on any operating system. Each conversation record, which is uploaded to the archiving FTP server, has a clear file name. The file name indicates:

  • the access code of the user, on which the conversation is recorded
  • starting time of recording as year, month, day, hours, minutes, seconds
  • a mark if the call is an originated one 
  • a mark if the call is a terminated one
  • the account id (if available)
  • the access code of B party
  • numbers dialed by the originating user
  • the caller id from originating user

Consequently, software enthusiasts (from novice to profesional) may easily develop their own applications, which may index, filter, report uploaded conversation records.

Uploading voice records with using file transfer protocol

The embedded FTP client within the Telesis system may upload conversation records to an FTP server

Security Notes

Make sure that the recordings are secure. Keep the PC running the XTools Utility or FTP server for archiving records in a safe place and accessible only by authorized personnel. Automatic conversation (voice) recording function in Telesis systems is technologically secured to prevent its unlicensed and unauthorized use. 

Related Readings

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


Copyright Telesis A.S. 2006-2013
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