I'm using Zoiper 1.23 on Android. No matter the settings I use for making a call, the outbound (Receiving) audio is very low. The other end describes it as 'sounds like you're in a tunnel'
I have tried every setup and configuratoin possible including, using SIP, changing to IAX, going through my PBX, or just registering directly to the provider (Voip.ms). I have tried toggling automatic gain control, to no affect. When I am internal, directly connected via IAX to the PBX internal IP, and do an echo test, I have confirmed the audio is unacceptably quiet. I have tested this again, outside the network, using sip connection, and then tested the echo test at Voip.MS, to the same effect. On every channel, trunk, protocol, and network, this issue is repeatable. THE TX AUDIO IS TOO LOW.
Where can I change TX Gain in zoiper; or better yet, can you guys fix the audio transmission volume level please.