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. See SMPP Delivery Receipts [smpp.org] .
See Melrose Labs Tyr SMS Gateway
Melrose Labs: 我们的使命是为企业，短信聚合器和消息传递提供商提供跨移动，固定电话和互联网的云通信中的关键服务。这些服务使组织能够在向客户提供服务，可靠性，对服务的洞察力以及提高的运营效率方面取得飞跃。