Amcrest Dorbell AD110 2 Way Audio

Hello,
I am trying to establish an audio connection via Home Assistant / go2rtc. Unfortunately, only the audio connection from the AD110 to HA / go2rtc works. Not vice versa. In an article I read that I have to change the audio codec:
URL: AD110
I did that as follows:

# API URL to Change Audio Codec on the Doorbell:
http://192.168.30.249/cgi-bin/configManager.cgi?action=setConfig&Encode[0].MainFormat[0].Audio.Compression=PCM&Encode[0].MainFormat[0].Audio.Frequency=8000

Unfortunately without success. Here is my AD configuration:

 "Encode" : [
      {
         "ExtraFormat" : [
            {
               "Audio" : {
                  "Bitrate" : 64,
                  "Compression" : "AAC",
                  "Depth" : 16,
                  "Frequency" : 16000,
                  "Mode" : 0,
                  "Pack" : "DHAV"
               },
               "AudioEnable" : true,
               "Video" : {
                  "BitRate" : 512,
                  "BitRateControl" : "CBR",
                  "Compression" : "H.264",
                  "FPS" : 20,
                  "GOP" : 60,
                  "Height" : 480,
                  "Pack" : "DHAV",
                  "Profile" : "Baseline",
                  "Quality" : 4,
                  "Width" : 640
               },
               "VideoEnable" : true
            },
            {
               "Audio" : {
                  "Bitrate" : 64,
                  "Compression" : "AAC",
                  "Depth" : 16,
                  "Frequency" : 8000,
                  "Mode" : 0,
                  "Pack" : "DHAV"
               },
               "AudioEnable" : false,
               "Video" : {
                  "BitRate" : 256,
                  "BitRateControl" : "CBR",
                  "Compression" : "H.264",
                  "FPS" : 30,
                  "GOP" : 60,
                  "Height" : 144,
                  "Pack" : "DHAV",
                  "Quality" : 4,
                  "Width" : 176
               },
               "VideoEnable" : true
            },
            {
               "Audio" : {
                  "Bitrate" : 64,
                  "Compression" : "AAC",
                  "Depth" : 16,
                  "Frequency" : 8000,
                  "Mode" : 0,
                  "Pack" : "DHAV"
               },
               "AudioEnable" : false,
               "Video" : {
                  "BitRate" : 256,
                  "BitRateControl" : "CBR",
                  "Compression" : "H.264",
                  "FPS" : 30,
                  "GOP" : 60,
                  "Height" : 144,
                  "Pack" : "DHAV",
                  "Quality" : 4,
                  "Width" : 176
               },
               "VideoEnable" : true
            }
         ],
         "MainFormat" : [
            {
               "Audio" : {
                  "Bitrate" : 64,
                  "Compression" : "PCM",
                  "Depth" : 16,
                  "Frequency" : 8000,
                  "Mode" : 0,
                  "Pack" : "DHAV"
               },
               "AudioEnable" : true,
               "Video" : {
                  "BitRate" : 768,
                  "BitRateControl" : "CBR",
                  "Compression" : "H.264",
                  "FPS" : 15,
                  "GOP" : 60,
                  "Height" : 1080,
                  "Pack" : "DHAV",
                  "Profile" : "High",
                  "Quality" : 4,
                  "Width" : 1920
               },
               "VideoEnable" : true
            },
            {
               "Audio" : {
                  "Bitrate" : 64,
                  "Compression" : "AAC",
                  "Depth" : 16,
                  "Frequency" : 8000,
                  "Mode" : 0,
                  "Pack" : "DHAV"
               },
               "AudioEnable" : true,
               "Video" : {
                  "BitRate" : 2048,
                  "BitRateControl" : "CBR",
                  "Compression" : "H.264",
                  "FPS" : 30,
                  "GOP" : 60,
                  "Height" : 480,
                  "Pack" : "DHAV",
                  "Quality" : 4,
                  "Width" : 800
               },
               "VideoEnable" : true
            },
            {
               "Audio" : {
                  "Bitrate" : 64,
                  "Compression" : "AAC",
                  "Depth" : 16,
                  "Frequency" : 8000,
                  "Mode" : 0,
                  "Pack" : "DHAV"
               },
               "AudioEnable" : true,
               "Video" : {
                  "BitRate" : 2048,
                  "BitRateControl" : "CBR",
                  "Compression" : "H.264",
                  "FPS" : 30,
                  "GOP" : 60,
                  "Height" : 480,
                  "Pack" : "DHAV",
                  "Quality" : 4,
                  "Width" : 800
               },
               "VideoEnable" : true
            }
         ],

What am I doing wrong?
Greetings from Stefan Harbich

Can anyone help me?