GSM 2 shield no sound on audio out

Official Hardware Retired GSM Shield
1

GSM 2 shield,

SMS receive and transmit working perfect,
make voice call, makes the call perfect, but I don't her anything (both sides of the connection, arduino and cellphone).
For receive a voice call it is working also ok,
I her the incoming call on my earplugs and the connection is made, but again no sound (both sides).
I use a earphone and microphone from my iPhone, also with a normal headset at both sites of te connections there is also no sound.
I use the standerd programs from Arduino.
I hope you can help me.
Greetings Pieter.

2

Has anyone solved this?
I have exactly the same issue. I hear the ring tone of the GSM shield, but as soon as the connection is opened there is no sound.

3

This has been solved, the issue being that you need to changle the audio channel on the GSM Module -> Arduino GSM shield 2 audio jack - Audio - Arduino Forum