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Follow the below mentioned steps to set default Sender ID:
- Login to your DO SMS Panel.
- Click on the arrow at the right of Company Name.
- Click on Settings.
- Write your 6 characters Sender ID in Default Sender ID field.
- Click on Update button to Save the Default Sender ID.
See our article on Sender ID Rules (Country Wise): Click Here
See our article on TRAI Rules for Sending SMS : Click Here