gsm interface with microcontroller

hi, i am trying to interface gsm mobile(ericson )with 8051. mobile and microcontroller responding correctly if i connect with computer serial port(com).but i connect gsm mobile with 8051 with null modem conection mobile is not respoding.in hypertermminal i used without any flow control signals.can you please help me in this?suggest me exate requaired signals to complete communication between mobile and 8051.

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