# No Audio Input/Output During Voice Call **URL:** \ **Category:** mangOH Green\ **Created:** [September 22, 2017, 1:59pm UTC](https://mangoh.discourse.group/t/no-audio-input-output-during-voice-call/747 "2017-09-22T13:59:03Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![JohnS](https://avatars.discourse-cdn.com/v4/letter/j/87869e/32.png) [@JohnS](https://mangoh.discourse.group/u/JohnS)\ **Post date:** [September 22, 2017, 1:59pm UTC](https://mangoh.discourse.group/t/no-audio-input-output-during-voice-call/747/1 "2017-09-22T13:59:03Z")
Hello everyone, thank you in advance for any support regarding this issue. I’m currently working on a project involving a mangOH Green, a Sierra Wireless WP7504, and the Legato platform. I’m using Legato version 17.07.1, and am trying to write a program that uses the mangOH board to place a voice call. I can get the device placing and responding to calls perfectly fine, but when the call is established, I cannot get any sound to transmit to or from the board. I have a pair of iPhone ear buds with a built-in mic (which, from what I understand, are AHJ/CTIA compatible; I’ve also tried regular headphones) plugged into the CN500 analog audio jack, and I’m using the le\_audio and le\_voicecall interfaces to establish the call. I’m also making sure that modemService, audioService, and voiceCallService are all running on the WP7504. In particular, I’m using this example: > **[mangOH/mangOH](https://github.com/mangOH/mangOH/tree/master/samples/tutorials/voice)** > > Primary mangOH git repository. Contribute to mangOH/mangOH development by creating an account on GitHub. I’ve also attempted using the “ATD1234567890;” AT command to dial my phone directly without running an executable, and I still had no luck getting any sound output (or input). I also verified the volume level and mute status via “AT+CLVL” and “AT+CMUT”. Could there be something wrong with my hardware? I can’t seem to find an answer either way despite searching. Thank you very much for any assistance in advance.