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Additional modules


The Callback module enables various types of callback based services. What is common for all types is that it is the provider’s system that initiates connections to two end points on a user request. The types of callback differ in the way how a user can trigger the service.

DID or missed callback

Initiated by making a phone call to a provider’s service number. The service number can be implemented by a DID from a DID provider, PSTN or GSM gateway.

Authorization methods:

  • By PIN the system calls back to the caller ID that has come with the call; after the call is connected the IVR (Interactive Voice Response system) prompts for a PIN; after successful authorization the system calls the destination number.
  • By Caller ID (ANI) the system tries to authorize the Caller ID received with the triggering call; if authorization is successful, the system makes a call back to the caller ID and asks for a destination number.
  • By DID in this method each user has a unique DID (virtual phone number) associated with his/her account. After dialing this DID the system initiates a call to a predefined phone number associated with the account (not the caller ID) and then asks for a destination number. This service is mainly for users that request callback using phone services with blocked caller ID.

SMS callback

In this method users trigger the callback by sending an SMS to a provider’s service number.

The system works with SMS numbers that are capable of delivering messages over SIP or HTTP protocols (e.g. Voxbone, Nexmo)

Authorization in this method can be by Caller ID of the phone from which the SMS has been sent or by user/password (or PIN) sent in the SMS content.

Web callback

Also called Connect Two is a conference between two parties initiated through the User Portal.

This type of callback can also be implemented in softphones along with VoIP and/or Call Through dialing.

Main Features:

  • Custom IVR scenarios with additional options like balance, rate, max call duration announcements
  • Multi-language support in IVR prompts
  • Ready to use sets of prompts in more than 30 languages
  • Option to wait until destination leg is connected before calling the initiating party
  • Authentication by PIN or Caller ID (PINless)
  • Shared accounts among other services like calling cards, mobile VoIP and others

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