I was looking into GSM module for Arduino and I would like to create something similar to my Android.
I would like to get the incoming call and merge it with the call that Arduino will do in a second moment.
Imagine that I want to call my Arduino from my phone, the Arduino gets the call and leave me in hold for a moment while is connecting with the second call. When the other person picks up the phone, Arduino will merge the two calls so they can talk each others.
I read that the SIM900 has come AT command for Conference and Waiting calls. Am I just dreaming or not?
i am also having the same requirement. how to accomplish that with sim900 or any other gsm module. i could only found a 'AT+CHLD' command from the AT command list, nothing more. please help me