BSNL MT841 Wireless - Dial In (No Auto Dial)

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Hello,Can you please help with with my problemBackgroundFor past 3 years I had been using BSNL connect UL750+ (unlimited)I had autodialin in MT841 (Type 4 with Wireless modem)Now I have shifted to BSNL 500 C+, also changed the modem settings to bridge so that I can use Dail in from PC and Laptop.My ProblemWith the cable i am able to dial in the modem and use internet however i am unable to dial in using through wireless (laptop). it give the error 678.I have search all over i am unable to find the configuration for dial in using wireless. as i am able to connect using the cable.Please help !!!