DUAL Talk - Internet Telephony Service Provider
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DUAL Talk - Internet Telephony Service Provider
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Accessing DUAL Talk

This page explains how to configure the ZyXEL Prestige 2000W WiFi telephone.

  • Calling rates

    We offer three tariff and routing plans:

    - DUAL Talk Gold
    - DUAL Talk Silver
    - DUAL Talk LCR

    You can choose your tariff depending on your traffic profile and whether your priorities lie with low rates or high voice quality.

    See more >>

  • Discount scheme

    We reward higher spending customers with discounts of between 5% and 19% determined by their spending levels.

    More information >>

  • Wholesale rates

    Reseller and wholesale customers with high volume can use our "DUAL Talk LCR" or "DUAL Talk Silver" tariffs and are eligible for discounts of up to 19% depending on volume.

    See more >>

  • DUAL Softswitch

    This calling service and its online control panels are powered by DUAL Softswitch.

    More information >>

ZyXEL Prestige 2000W

The ZyXEL Prestige 2000W is a Voice over IP telephone that uses WiFi for its internet connectivity.  This configuration guidelines assume that you have already configured the telephone for access to the Internet through a wireless access point and that the telephone has full connectivity.

We recommend that you upgrade to at least version Wj.00.10 of this telephone's firmware.  We encountered problems when testing with a lower firmware release.

Configuration guidelines

  • URI  =  [Any number]
  • SIP server address  =
  • SIP server port  =  5060
  • Registrar server address  =
  • Registrar server port  =  5060
  • Registry expiry time  =  1800
  • Registrar user name  =  [Your DUAL Talk account number]
  • Registrar password  =  [Your DUAL Talk password]


  • Select type  =  Disable NAT


  • Default voice codec  =  G.729, 8k
  • Jitter buffer  =  Small (but you may need to increase this if the voice quality is bad)
  • Voice frames per packet  =  Small (but you may need to increase this you have limited bandwidth)
  • DTMF relay  =  Outband

Test calls

We offer a simple test facility on our servers that you are welcome to use.  To call it, configure your software or hardware dialler to send calls to DUAL Talk, and then dial 123.  You should hear a test announcement.  If you hear this, then your equipment is set up correctly and you should be able to use DUAL Talk.
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Last modified: 10 May 2011

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