Mobile Number Portability and how it affects SMS and MMS?

RoutoMessaging SMS Gateway supports number portability.

Mobile Number Portability (often abbreviated to MNP) is, no different from fixed number portability. MNP is where a mobile subscriber changes networks but retains their number, their existing number is ported to the new network.

Unlike voice calls, which are connected directly, SMS messages are delivered through Short Message Service Centres (SMSCs). Messages sent by clients of RoutoMessaging will always be delivered by RoutoMessaging on their behalf.

RoutoMessaging Techniques for MNP Routing

• Onward routing (OR): Attempt is made to deliver the SMS to the network to which the ported number belonged. The attempt is identified in the network as being a SMS sent to a ported number and the SMS is routed onward to the new network.
  
  
• Call drop back (CDB): CDB is an enhancement of OR. When the original network receives the SMS, it releases the SMS and returns a message indicating that the number has been ported (and provides routing information). This drop back message is used by a transit or an originating network to route the SMS onward to the new network.
  
  
• Intelligent-network-related (IN-related): IN-related solutions use a database which is interrogated to identify whether the number has been ported and, if so, to which destination. A range of IN-related solutions are possible, including all call query (ACQ) and query on release (QoR).
  
  
• Signaling relay (SR): SR is a solution for GSM using existing GSM functions. The network uses the GSM signaling relay function (SRF) to send a routing inquiry to the recipient network, which returns the routing information required to properly route the SMS. The routing information can be used either to reach the recipient network or the current visited network (if the recipient is roaming). If mobiles with ported numbers are often roaming in other networks then this obviously has efficiency advantages.