SMSC or Short Message Service Center
SMSC is a node located in mobile operators home network (HPLMN), provides SMS services to the mobile users. This is a key node in the telecom network. For sending sms sim card to have a SMSC number configured. SMSC provides reliable delivery of mobile originated and mobile terminated text message. When a mobile user sends text to other mobile users. First, SMS reaches to the SMSC, this called submitting a SMS on smsc. For reaching a text to SMS from the handset, ss7 signalling is used.
Enabling SMS service:
Every service to the mobile sim card is configured in the subscriber profile on HLR. For SMS, the subscriber should be enabled for MO-SMS and MT-SMS Teleservices and there should be no barring of SMS is set. Before allowing to send and receive a test to/from mobile, roaming network checks for the subscription for SMS service. Roaming network downloads the subscription information at the time of location update.
Mobile Originated SMS :
Mobile Terminated SMS.
Store and Forward.
Priority message handling.
Message Waiting Data on HLR.