Fax Calls
DUAL Talk is primarily a voice service, but fax calls should be successful to most destinations.
Our primary support for fax uses the T.38 protocol in conjunction with both H.323 and SIP. T.38 compatible devices include the Quintum range of second generation gateways, Welltech gateways and Elesign gateways. For devices that do not support T.38, fax calls can be made using a G.711 codec. By default, G.711 is disabled on accounts, but we can enable this feature for fax use only.
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 Transcom account. To call it, configure your software or hardware dialler to send calls to Transcom, 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 Transcom, once you have established an account.
Audio Quality
Audio quality on the Internet based Transcom 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 Transcom using a software dialler on your computer, we offer the following advice:
Use a headset.
USB headsets often offer higher quality than sound card headsets, but are a little more expensive.
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
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 Transcom accounts from the same IP address.
If you need to use more than one account at the same IP address, then you should use our SIP Proxy Authentiction feature.
Please contact us for more information on any of these options.
