Colour SMS is an easy-to-use HTTP based SMS protocol. It was developed by T-Mobile Hungary for premium rate SMS services.
When a customer tries to access a
premium rate SMS service by sending an SMS to a premium rate phone number,
the SMSC transfers this message as an HTTP post request to the HTTP Server
operated by the content provider. The content provider responds to the
HTTP request in XML format. This response is sent as an SMS message back to the
customer. Ozeki Message Server 6 is the HTTP Server operated by the service provider. (Figure 1.).
1 - Colour SMS transport
Due to the nature of the HTTP protocol, it is always required to respond to incoming messages in a short period of time. The Colour SMS protocol is often used with other connection methods, like UCP to make delayed responses to incoming messages possible. Using a UCP connection, response messages can be sent at a later time, which is useful if you would like to set up periodic SMS notifications, for example weekly news service.