what is smsc number

What is smsc number:

Every message in telecom network needs a address or global title to send. A smsc number is the Global title of smsc. Mobile operators uses SMSC node for providing sms services to the mobile subscribers. Its a E.164 type number. Similar to a mobile phone number have digits. It is stored in mobile sim card when a sim card is active or smsc uses it calling party GT in MT-SMS signaling.

SMSC number in phone:

SMS uses SS7 protocol for messaging. Each node in ss7 network is identified by a global titile. When a user sends the SMS , it first reaches to the VLR in roaming network.  VLR get SMSC number or GT from sms. Based on GT , VLR sends MO-SMS to the service center. 

A sms may be in multiple part, smsc does the assembly of message segments.  Each segment has smsc number in called party. The sms  from VLR to smsc uses SS7 protocol

SMSC number in SMSC:

While sending MT-SMS , smsc set in calling party its own smsc number or GT. So that the responses can be routed back, from destination network.  Two GSM MAP operations (SRI-SM and Forward-SM) over ss7 or sigtran are used by SMSC for MT-SMS. 

SMSC tutorials -Protocols Explained.

Changing SMSC number:

When a sim card is inserted in the mobile device, the service centre address automatically set or its update by the mobile network operator over the air. But still there are situations when outgoing sms is not working.  This may be because,  the SMSC number stored in phone is not correct or mobile subscriber is not allowed for messaging service.

In both the cases, mobile subscriber needs to call customer care.  If sms is not working because of, no subscription for messaging service on HLR.  The customer care executive can update the subscription profile on HLR for sms service.

If the smsc address is not correct then based on model and brand of phone device, the customer case executive can guide to change the smsc number with correct value.

  • message center number android:
  • 1. Go to home screen.
  • 2. Click on messaging app.
  • 3. On top , side click,ad go to settings.
  • 4. More settings.
  • 5. Text Messaging.
  • 6. Message Centre.