Cascades
If your SMS provider offers Viber option, the logic is as follows:
- If only SMS text is specified, only SMS is sent. 
- If only Viber text is specified, only Viber is sent. 
- If both SMS and Viber text are specified, then attempt is made to deliver message via Viber, if it fails within 3 hours, the message is sent as SMS. 
The following categories of recipients do not receive Viber messages:
- Recipients, who don't have Viber installed; 
- Recipients, who turned off Viber on the day of the mailing; 
- Recipients, who pressed "unsubscribe from this brand's mailings" in their Viber (standard Viber functionality for branded mailings). 
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