GSM arduino or SIM Conference call

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? :slight_smile:

I can't see how that would really work for data. What exactly are you trying to accomplish ?

It seems like with SIM900 you can do this system.
I just want to merge two calls as you do with an Android or Iphone

michinyon:
I can't see how that would really work for data. What exactly are you trying to accomplish ?

Sounds like he's trying to build a robo-dialler.

Nope :slight_smile: just a bridge between two calls, thats all.

SIM900 answered me back that it's possible so I guess I will go for this one

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

The sim900 and sim800 are 2 G devices, make sure your country is still 2G ?

Do not fall for the more common 900A modules unless you are in one of the far east countries its locked to.

Also look at the more modern sim800/808 devices.

Avoid the very basic boards, get a module with onboard regulator or better still a shield.

Be aware that the shields pins need modifing if used with a Mega board.