The beta version of WhatsApp won a similar appeal to the mailbox used in mobile phones. The novelty, in a version of the program for testing, allows you to send a voice message to a contact if the call voice is rejected or no answer, no need to go back to the conversation. Furthermore, it is also possible to return the call.
The new feature is available in Messenger beta version for Android and iPhone (iOS). Only users with WhatsApp beta installed on the smartphone will be able to burn an audio or return the call. Remember that the Web WhatsApp, Messenger version for PCs, has no links function and, therefore, did not receive the new feature. See this tutorial how to install the trial version on your phone.
The new function remembers the name mailbox feature or voice mail, which is offered by telephone operators. When you call someone, but the call is not answered, you can leave a message for the person to listen to later.
To begin using the messenger news most used in Brazil, just make a call by beta app. If the other person does not answer your call, you have the option to dial again or record a voice message, simply tap the icon equivalent to each resource. If you record an audio, it is sent by the conversation that you already have in the messenger with that contact. If you do not perform any of the two actions, just tap "Cancel".
When the situation is reversed, and you are rejecting a call, you can reply with a text message. This feature was already available before and is valid if you want to explain why not answered the call at that time. In this case, the message is in normal chat.