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 your H.323 or SIP compliant dialler or hardware device to send calls to the DUAL Talk network.

  • 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 >>

VoIP configuration guidelines

We offer specific configuration guidelines for the following calling clients:

Please click here to see our recommended VoIP gateway solutions.

DUAL Talk software dialler

If you do not have an H.323 or SIP compliant device, then please try DUAL Phone; our software dialer designed specifically for making international telephone calls through DUAL Talk.  Alternatively, if you are in the UK, you can make calls through your DUAL Talk account using an 020 access number.  There is more information on this feature at My DUAL Talk; the online account management system.

General configuration guidelines - H.323

This section explains how to access DUAL Talk using an H.323 compliant device.  If you do not yet have a VoIP gateway, please see our recommendations on supported hardware solutions.

The configuration of your dialler depends on whether you have a fixed or dynamic IP address.

Fixed IP address

  1. Make sure the IP address you use has been added to your DUAL Talk account.  If you did not add this address while setting up your account, then add this IP address at the Access Methods area of My DUAL Talk; the online account management system.
  2. Configure your equipment to send all telephone calls to a gateway.  The gateway IP address is 95.154.218.4.  If possible, we recommend that you use the DNS name gw1.dualtalk.com.

Dynamic IP address

  1. Make sure that your DUAL Talk account has been configured for dynamic IP addresses.  If you did not do this while setting up your account, then set this option now at the Access Methods area of My DUAL Talk; the online account management system.
  2. Configure your equipment to send all telephone calls to a gatekeeper.  The gatekeeper IP address is 95.154.218.4.  If possible, we recommend that you use the DNS name gk1.dualtalk.com.
  3. Configure your equipment to register at the gatekeeper using an E164 alias (telephone number) or an H.323 alias.  The alias address should be 1822 followed by your DUAL Talk account number followed by your DUAL Talk password (emailed to you when you set up your account).  For example, if your account number is 200100 and your password is 900100, set the E164 alias to be 1822200100900100.

The codecs we support are G.729 and G.711.  You should enable both Fast Start and H.245 tunnelling.  You should configure your equipment to send DTMF digits using UserInputIndication messages through an H.245 tunnel.

We support fax calls to most worldwide destinations.  To send faxes, you must use the G.711 codec.

General configuration guidelines - SIP

We recommend accessing DUAL Talk using the H.323 protocol.  Nevertheless, we support SIP, and this section explains how to access DUAL Talk using a SIP compliant device.  If you do not yet have a VoIP gateway, please see our recommendations on supported hardware solutions.

The configuration of your dialler depends on whether you have a fixed or dynamic IP address.

Fixed IP address

  1. Make sure the IP address you use has been added to your DUAL Talk account.  If you did not add this address while setting up your account, then add this IP address at the Access Methods area of My DUAL Talk; the online account management system.
  2. Configure your equipment to send all telephone calls to our SIP server at sip.dualtalk.com:6060.   You must use the non-standard port 6060 if you are using fixed IP address authentication.
  3. It is not necessary to register with our SIP server.

Dynamic IP address

  1. Make sure that your DUAL Talk account has been configured for dynamic IP addresses.  If you did not do this while setting up your account, then set this option now at the Access Methods area of My DUAL Talk; the online account management system.
  2. Configure your equipment to register with our SIP server at sip.dualtalk.com.  Our server supports Digest authentication.  You should configure your device using your DUAL Talk account number and password.

The codecs we support are G.729 and G.711.  You should configure your equipment to send DTMF digits using INFO method SIP messages.

We support fax calls to most worldwide destinations.  To send faxes, you must use the G.711 codec.

Fax calls through DUAL Talk

DUAL Talk is primarily a voice service, but fax calls should be successful to many destinations.  You should ensure that your equipment is using the G.711 codec when making a fax call.  SIP adapters can often be forced to use G.711 if the dialled number is prefixed with *99 or *99#.

Test calls

We offer a simple test facility on our servers that you are welcome to call for testing.  This should work, even if you do not have a DUAL Talk account.  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, once you have established an account.

Audio quality

Audio quality on the Internet based DUAL Talk network is equal to the quality on standard fixed telephone lines.  You will enjoy the highest voice quality and the lowest delays if you use an IP phone such as the Cisco ATA 186 or the Elesign ESC1710.

If you plan to make calls through DUAL Talk using a software dialler on your computer, we offer the following advice:

  1. Use a headset.
  2. USB headsets often offer higher quality than sound card headsets, but are a little more expensive.
  3. Do not use desktop speakers for listening to the call.  Although the quality may sound fine to you, the people you call will hear a disturbing echo.

Advanced authentication options

We are also able to authenticate your calls by technical prefix or calling alias.  This can be useful if you need to send us calls for multiple DUAL Talk accounts from the same IP address.

Please contact us for more information on any of these options.

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Last modified: 08 November 2011

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