Teracom - essbebe's1.
TERACOM Type2( T-2B-Gawv1.4U10Y-BI)
This model ADSl wifi modem(as well as Adsl modem)is
being supplied by BSNL to its customers recently.
It appears mostly,this is based on Siemens C2110
(less WIFI), for which many links are available.
Teracom :: ADSL Modem
http://www.teracom.in/htmls/type1.rar patch 1
http://www.teracom.in/htmls/type2.rar patch 2
Email & Phone No.
Customer Support Email : firstname.lastname@example.org
Customer Support Phone No.: 09718884242
Also on line form for technical assistance.
If some options are not seen ( port forwarding etc )
try in "Always On" mode instead of "Dialer".mode.
PS: I don't have this model.