Conference Call
Overview
Conference call offers a convenient way for two or more people to talk with each other at the same time. The Web21C Conference Call Service enables calls from landline telephones or softphones. You may initiate a call, bring people onto a call and remove people from the call, programmatically.
Features
The Web21C Conference Call Service currently offers the following features:
- SIP & PSTN Gateway - Allows you to connect any combination of participants, located anywhere in the world, to join your conference call. Any of the participants may be connected using either a softphone or a landline telephone.
- Conference Duration - Allows you to specify the maximum length of the conference call in advance, ending calls after the given time period.
- Maximum - Allows you to restrict the number of participants on the call.
- Information - Allows you to obtain call state information, call duration information and the number of participants.
- Dial-out conferences, but not dial-in. This means that all of the participants must be invited into the conference
- Pre-conference announcement - Participants are played the following announcement before being added to the conference: "Hello. You are being invited to join a conference call. Please press '1' to continue."
- There is the option to have no pre-conference announcement, or a choice of different announcements.
- Announcements - are available in multiple languages and voices:
- 1:English female 1
- 10:Spanish male
- 20:Italian male
- 31:Polish male
- 50:Greek male
- 60:French female
- 2:English female 2
- 3:English male
- 30:Polish female
- 40:German male
- After the pre-conference announcement, each participant will be prompted to "Press 1" in order to proceed.
- CLI Blanking - Instead of sending a phone number to the participants in a conference, the CLI is blanked, so they get "Number Unavailable".
- Automatic refund of credits for unsuccessful calls.
Note:
UK premium numbers, as regulated by ICSTIS, are blocked, as are other premium rate numbers worldwide.
The list of blocked numbers can be updated without giving notice, where such numbers allow customers to exploit arbitrage opportunities in our pricing. The Web21C SDK services are not intended to be used for medical emergencies, satellite communications or other specialist purposes.
Calls are limited to a maximum of one hour, after which they will be terminated.
Call information that is available to client applications is accessible for a period of 3 days.
Applications
The Web21C Conference Call Service might be used on a website, or in an application as part of a Web-based multimedia presentation, for instance. The Conference Call Service is used in the Conference Call sample application, which is available as part of the Web21C SDK in the Downloads page. To go there, please click here.
Note: Use our free virtual phones to test your applications work, please click here.
To make an audio call between a number of telephones requires only a few lines of code.
To establish a conference call:
- Initiate the conference call
- Invite the participants onto the conference call
Code Example: (C#, using the Windows Forms component)
//Drop a Conference Call component onto your form from the Toolbox.
//participants is an array containing the telephone numbers of the participants
conferenceCall1.StartConferenceCall();
foreach (string participant in participants)
{
conferenceCall1.InviteParticipant(participant);
}