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What is bulk SMS

Bulk SMS is the process of sending multiple sms to multiple mobile subscriber in short time. This messaging required software automation to archive the sending sms in large volume in short time.  There are following types of messaging involves.

        Bulk SMS details

• A2P : Application to person , in this a sms is sent from Application software to the mobile device.E.g  send a text message from back to account holder's mobile.
• P2A : Person to application, in this sms is sent from person to an application software.E.g  send a text message to a short code.
• P2P : Person to Person ,  in this a sms message is send from one mobile device to other.
• E.g  Send a text message from your mobile to your friend's mobile.

Bulk SMS service is used to advertise a service or to get feedback etc. There are 2 kinds of codes are used for p2a messaging service. P2A service is used to receive feedback or make voting from mobile devices. These code are call Short Codes and Long Codes.

Short Codes:

These are 6 or 5 digits numbers which are easy to remember. A mobile phone user sends sms from mobile devices to this number. Each mobile operator of specific mobile operator set routing for MO sms towards the application serving the short code. Special rates are applied to the sms sending to the Short Codes.

Bulk SMS Flow for Short codes:

1. Mobile user types sms text and sends the sms to a short code. 
2. Visiting MSC sends a GSM MAP over SS7, MO-ForwardSM message to the mobile subscriber's SMSC. 
3. SMSC sends MO-ForwardSM response back to the visiting MSC.
4. SMSC selects the SMPP ESME, which has bound for the short code. 
5. SMSC Sends DeliverSM message to the SMPP ESME. 
6. SMPP Esme  sends DeliverSM response back to the SMSC over SMPP. 

What is sms message :

·         SMS message contains the actual text and following information.

·         Encoding

·         Length

·         Segmentation information

·         Based on above information a sms is assembled and displayed on mobile device.

Communication Nodes and protocols In Bulk sms network:

• Nodes :  HLR, SMSC, MSC, VLR, SMS gateway
• Protocols : SS7 , Sigtran, SMPP, HTTP, TCP, IP, SCTP

• ·         SMS App Submits SMS over SMPP ( can be on HTTP also) to the Bulk SMS Provider.
• ·         Bulk SMS Provider selects the route and submit sms over SMPP , to the Mobile Operator's SMSC.
• ·         Mobile Operators SMSC  send  SRI-SM request to the HLR of MSISDN provider.
• ·         HLR responds whit SRI-SM Response , which contains IMSI and Visiting.
• ·         Upon getting SRI-Response,  SMSC sends Forward SM  to visiting MSC.
• ·         Visiting MSC sends Forward SM response to SMSC.
• ·         SMSC sends Delivery Report to the Bulk SMS platform over SMPP.  
• ·         Bulk SMS platform sends delivery reports to SMS App over SMPP (or HTTP)