Abstract: Techniques are disclosed for correlating delivery receipt (DLR) messages with short message service (SMS) messages sent in an application-to-person (A2P) manner through a messaging network comprising multiple data centers. SMS and DLR messages are received and stored into a correlator comprising a local and a global storage area. It is then determined whether a received DLR message corresponds to a received SMS message within a local timeout period associated with the received SMS message. When corresponding DLR and SMS messages have been received they are correlated and the DLR message is sent to the sending SMS client. When corresponding DLR and SMS messages have not been received the location of a global storage area of a correlator in a data center where the DLR and SMS messages are intended to be stored is derived.

Abstract: Techniques are disclosed for passing short message service (SMS) messages between sending and receiving SMS service providers over a network comprising a default data center and one or more alternative data centers. The default data center may receive message segments of an SMS message from the sending SMS provider into a local storage area of a concatenator comprising a local and a global storage area. The message segments may include segmentation information indicative of a number of message segments associated with the SMS message, routing information, the sending SMS provider, and the receiving SMS provider. When all the message segments have been received within a local timeout period, the default data center concatenates the message segments into a single SMS message and sends it to the receiving SMS service provider.