When an SMS is sent to a Telecommunications Service Provider, they return a delivery receipt. Telecommunications Service Providers send the delivery receipt at a moment of their choice, not actually having to wait for delivery confirmation. A delivery receipt can be either: Carrier – returned to the message deliverer when the message is received by the Telecommunications Service Providers. Handset – returned to the message deliverer when the message is received on your user’s handset. In practice, some Telecommunications Service Providers either do not send the delivery receipt or send a fake delivery receipt . Unfortunately no message deliverer can be 100% certain that a ‘successfully delivered’ delivery receipt actually means that the message reached the user. If the message is not received, this delivery receipt explains why the message failed to arrive.
Melrose Labs: Our mission is to deliver pivotal services in cloud communications across mobile, fixed-line and internet for enterprises, SMS aggregators and messaging providers. These services allow organisations to take leaps forward in the services they provide to their customers, their reliability, insight into their services and increased operational efficiency.