TEL - ISDN audio calls from your web browser

Yes. With just your computer and an internet connection for a fixed monthly or annual fee. No ISDN line required.

Tel Tel+
Call landlines
Receive ISDN calls
Outgoing ISDN calls
Call cell phones
Getting started with Tel

Just add Tel to your ipDTL subscription.

Two service levels are offered: Tel and Tel+. Tel allows calls to landlines and some mobiles in many countries, and the ability to receive incoming ISDN audio calls. Tel+ also allows calls to ISDN audio codecs and a wider range of countries and mobiles.

Making a simple ISDN call

To dial a basic G722 ISDN quickly: Click the Dialpad icon. Enter the "+" symbol, followed by country code, then the number with any leading zeros omitted.

Now click the Connect ISDN button.

ISDN Number Format Examples:
USA: +1 202 456 1111
UK: +44 20 7766 7300

Advanced ISDN Calls
Common ISDN Formats:
US Voice Session:ISDN L2 128 Mono
UK Voice Session:ISDN L2 128 JS
BBC Radio Contribution:ISDN L2 64

Most ISDN calls require at least some knowledge about what equipment is at the other end. You can make an outgoing call, or set ipDTL to receive an incoming call.

  1. Click the Dialpad icon. ( )
  2. Choose Outgoing or Incoming.
  3. Click the cogwheel icon. ( )   Select the correct format for the device to which you wish to connect.
  4. Enter a phone number starting with + and the country code - Tel subscription required.
  5. Now click the Connect ISDN button. For incoming calls you will then be presented with the number(s) for the ISDN user to dial.
Adjust the other settings as required...
Private:Only your Login IDs can see and call the destination. Deselect to use with Link+. *
Auto RX:This can be useful if you don't know the sending format of the destination.
32/48KHz:There is no standard for this setting. Ask the ISDN owner what it is set to.
56/64kBit:The standard is 64k. In North America, some destinations may require 56k.
Create a Dialing Shortcut

You can also save an entry in your Destinations list. (+)

  1. In the first menu selector, choose Dialing Shortcut or to receive an incoming call, Incoming Shortcut.
  2. In the next box, enter a name that describes the shortcut. e.g. Receive ISDN Call.
  3. For outgoing calls, enter the ISDN number(s) for the destination in the last box(es).
  4. Click Save.

You can now connect by simply clicking it in your main Destinations list.

* Note that by default, Link+ is Auto-Accept only. Contact us to change this for use with ISDN.

Advice for the ISDN owner:

Telos Zephyr
Just ask for their settings and match them in ipDTL.

Prodys Pronto
Use the following settings for L2 128: L1>CODEC>MPEG>MODE>TELOS>DUAL

Set to SPEED DIAL 37 for L2 128 or SPEED DIAL 27 for L2 128 JS

Fair Use Policy:

The Tel service is provided on a 'fair-use' basis. Tel+ allows up to five hours of outbound ISDN calls per month. After subscribing, you can upgrade to higher volume packages.