Bulk Sender ID / header approval from BSNL DLT Portal
Once DLT system go live then all sender ids will be approved by DLT portal only. Old sender ids will not work. Note: You need to register your business to DLT first. If still not done then refer How to register for DLT portal? First you need to login to your BSNL DLT portal as EnterpriseThen click on headers >> SMS headers option.
SMS Headers OptionThen click on add option 
Add Header
Then you will see Sender ID request form:
For transactional SMS sender ID click on other.Then type your six character alphabetic sender id related to your business.Then click on search button, it will show if this sender ID available or not.You can only request sender id that is available.Then type explanation, how this sender id is related to your business / product / service.Then click on submit for approval. 
Sender ID Request FormOperator will review and approve your sender ID within 72 hours.
BSNL DLT Registration Process
DLT is mandatory compliance for Bulk SMS service in India. Every business need to register their business in DLT. It’s three steps process
