What is two additional character before sender id

When we receive sms the sender id would be like this BH-ZUBRIX. Here the first two characters of the sender id, that is BH. B as in BSNL services, hence this is a Telecom Operator Code and H as in Haryana, hence this is Regional Code. For example below is the table.

Provider Code Region Code
Airtel A Andhra Pradesh A
BSNL B Bihar B
Datacom Solutions C Delhi D

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