Intercom from BSNL

I had taken an intercom from BSNL with is integrated to the apartment EPBX in Brigade Millennium. When they shifted it everything was working fine with no issues seen in broadband or the land line connectivity. One needed to press "0" to connect to local call. The STD by default got blocked. To enable it I needed to set a password for access. The procedure for which is as follows:

1. Press 123 xxxx xxxx (where xxxx is your password)
2. Press 124 xxxx 0 to open the STD facility
   
3. Press 124 xxxx 1 to close the STD facility

I also tried a new facility for informing BSNL of landline fault. One were to send LLF to 56xxxx (I forgot!!). This works perfectly well.