SMPP is the industry standard for sending and receiving SMS with high throughput. Many out-of-the-box solutions arrive with support for this fast and featureful API.
The industry standard SMPP API is often used by larger organizations who sends out a high volume of messages. The SMPP protocol uses a persistent connection between TeletopiaSMS and the customer, so the overhead of sending and receiving messages and delivery reports is kept to a minimum.
Given that the SMPP protocol is a low level protocol, either a third party solution or specialist knowledge is required in order to use this interface.
Benefits of using the SMPP API include:
You can find a list of delivery report error-codes here.