There are two options to send sms on DND number and sender id
A) Approved Template
For sending fix format Transactional sms this service is useful. in this we need to approve SMS template from TRAI than we can send sms to any number with sender id. We can use this service informing Transaction done by user / Client. for E.g if user register on website than we can send following sms e.g Dear < Name of user > Thank you for registration on our Web site your registration id is < R id > please use this for future references. or Dear < User name > You have successfully registered on Spider Web. your user id is < used id > and Password is < password > Spider Communication Pvt Ltd.
in above sms we can change text between < > brackets any other sms will be blocked
B) OPT in Service
For sending any sms we need to ask our customer, clients, friends to opt in our group by purchasing key word, once user opted in than we can send any sms to that number by our sender id.
How it works
a) Register a keyword like SIDER
b) Send following SMS from DND numbers
c) START< space > SPIDER send to 7738098600
d) you will received confirmation sms as your number is registered
e) you can check how many dnd numbers opted in for your group
f) Once number is registered than you can send any sms