1. SMSC Technical Presentation
Md. Zillur Rahman
Deputy Manager(Operation)

2. Short Message Service Center
Supplied by Huawei
Developed by Huawei
SMSC GT
SMSC Point Code 2208

3. SMSC Features Mobile Originating Messaging
Mobile Terminating Messaging
Direct Mode
Store-and-Forward
Datagram Mode
Text Messaging

4. SMSC Features Concatenated Short Messages Scheduled Messages
Message Expiry
Delivery Reports
Background Messaging
Configurable Retry Algorithm

5. SMSC Features (Continued)
Black and White Lists
Anti Spamming  defines maximum number of messages to a single subscriber
Output Regulation  prevents overloading of Signaling Link
Input Protection protects throttling of SMSC by burst of MO Traffic
Priority Messages

6. SMSC New Features SMS over GPRS Distribution Lists
MT spamming detection
SMPP 3.4

7. SMC in GSM Network

8. SMSC Architecture

9. SMSC System Architecture

10. Shot Message A message is one of the following: Message Size
MO to SMSC
SMSC to MT
SMSC to ESME
ESME to SMSC
Message Size
bit characters
- Concatenated SMS using Multiple Messages with UDH containing segmentation information bit characters
- Maximum 255 segments (Practically 5-6 segments)

11. Message Handling

12. Message Handling MT Errors: Unknown Subscriber (1)
Subscriber Mobile Switched off (24)
Tele Service not provisioned (11)
Memory Capacity exceeded (32)
HLR Does not reply after routing message sent (41)
MSC Does Not reply (48)

13. Retry Algorithm
How long SMS will be stored and How many times SMS will be retried is decided by the Retry Algorithm
There is a configurable retry algorithm against each MT error.

14. Validity Period Processing
Retry algorithm
System Maximum validity period
System default validity period
Validity period set by subscriber

15. On-Net SMS Delivery MO Dhaka MSC SCP HLR Bogra MSC MT MT-ACK MT-ACK
SMS-MO
IDP
SCP
HLR
CON
SRI
MT-ACK
SMS-MT
SRI-ACK
Bogra MSC
SRI
SMS-MO
SMS-MT
SRI-ACK
MT-ACK
MT-ACK
SMS-MT MT

16. Off-Net SMS Delivery MO Teletalk MSC GP GMSC SCP GP MSC MT GP HLR
SMS-MO
IDP
SCP
SRI
CON
MT-ACK
SMS-MT
SRI-ACK
GP MSC
SRI
SRI-ACK
SRI
SMS-MO
SMS-MT
SRI-ACK
MT-ACK
MT-ACK
SMS-MT MT
GP HLR

17. Thank You