no audio after call connected

[andicrb76]

Dear Sir,

i have tested your new viciphone 2.1, and i was using vp_interpreter.php to register the webphone.
The register was succeed but when i call and get connected, but there was no audio.
I'm not sure this is a bug, maybe i missed something ?

FYI, my server specs:
-Asterisk 16.15.1 built by mockbuild @ jenkins7 on a x86_64 running Linux on 2020-12-23 15:37:11 UTC
-Freepbx 15

Thank you
best regards

Andi