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SMSC Technical Presentation
Md. Zillur Rahman
Deputy Manager(Operation)
Short Message Service Center
Supplied by Huawei
Developed by Huawei
SMSC GT 880150159999
SMSC Point Code 2208
SMSC Features
Mobile Originating Messaging
Mobile Terminating Messaging
Direct Mode
Store-and-Forward
Datagram Mode
Text Messaging
SMSC Features
 Concatenated Short Messages
 Scheduled Messages
 Message Expiry
 Delivery Reports
 Background Messaging
 Configurable Retry Algorithm
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
SMSC New Features
 SMS over GPRS
 Distribution Lists
 MT spamming detection
 SMPP 3.4
SMC in GSM Network
SMSC Architecture
SIU
ESME
ESME
ESME
SMPP, EMI, SEMA over
TCP/IP or X.25
GSM
Network
SMSC
Huawei
USAU
Billing System
OAM System
Prepaid
System
SMSC System Architecture
Shot Message
 A message is one of the following:
 MO to SMSC
 SMSC to MT
 SMSC to ESME
 ESME to SMSC
 Message Size
- 160 7-bit characters
- Concatenated SMS using Multiple Messages with UDH
containing segmentation information 153 7-bit characters
- Maximum 255 segments (Practically 5-6 segments)
Message Handling
MO
MT
SMSC
MO Submit
MO Response
(Ack / Error)
MT Deliver
MT Response
(Ack / Error)
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)
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.
Validity Period Processing
• Retry algorithm
• Validity
period set by
subscriber
• System Maximum
validity period
• System
default
validity
period
On-Net SMS Delivery
MO
Dhaka MSC
SMS-MO
IDP
8 U
SCP
CON
HLR
8 U
SRI
MT-ACK
SRI-ACK
SMS-MT
Bogra MSC
Site
SRI
SMS-MO SMS-MT SRI-ACK
MT-ACK
MT-ACK
SMS-MT
MT
Off-Net SMS Delivery
MO
GP GMSC
Teletalk MSC
SMS-MO
IDP
8 U
SCP
CON
SRI
8 U
MT-ACK
SRI-ACK
SMS-MT
SRI
SRI-ACK
SRI
GP MSC
SMS-MO SMS-MT SRI-ACK
MT-ACK
MT-ACK
SMS-MT
Site
GP HLR
MT
Thank You