I am using Zoiper on my android devices for incoming calls from another mobile and fixed networks.
When I was on the old version 1.19.8 everything was OK. But after updates to the newer versions every time I have one way audio. When somebody calls me to Zoiper, he hears me, but I can't hear.
I tried all the proposed solutions in Zoiper site (RPORT, STUN disable, transport type, audio driver), but no effect.
It's interesting that occurs only when I am using mobile internet (2G, 3G, 4G).
My VoiP vendor doesn't have a solution, they told me to remove Zoiper and use SipDroid. I tried with SIPDroit, it works, but the software is unstable and not reliable. I prefer to use Zoiper.
Then I found in internet again the old version 1.19.18 and now it's OK.
What is the difference between the old and new versions and why cannot be set the newer versions with the same settings of the old versions. All the versions appear similar, but with different behavior.