java - Android App to App Calling Best Options -

good day. without further ado want describe situation.

i have built social network app android , it's time voice calling function come in.

i have done lots of researches audio calling done within libraries prepared, have managed social network messaging sockets switched point of view self-driven audio calling mechanism.

the achievement have reached :

• have managed audio calling via socket.io have of concerns , describe them little later.

here how have implemented socket audio communiaction between 2 devices.

1 - have registered 2 devices onto socket server.

2 - using audiorecord class capture user voice.

3 - after voice captured, compressing data of deflater , sending each byte of captured data through socket receiver.

4 - receiver package , decompression after receiver passing received byte array audiotrack class plays audio data in byte array.

notes : recording sample rate 44100. server google compute engine. tested devices - samsung s7 edge , samsung s4.

the issue had : there starting huge delays after period of time,lets 20 seconds later , during debugging can reckon delay due huge amount of server load sending audio data inside while loop each voice byte data.

so can reckon mechanism not 1 must used.

at end of research encounter of best practice saying better use peer-to-peer communication best option both : audio , video calling, saying idea open connection between 2 devices , let them send/receive data without touching server there no huge delays,neither server load.

my primary question next :

what best practice android device-to-device or peer-to-peer connection through can send audio byte data?

if can suggest better mechanism,can share you'r idea of working practice?

thank you.