Implemented multiple fixes for serious bugs.
Migrated to TURN/STUN.
High quality ratings.

We expect the contestant to take part in round 3. Suggested priorities:
1. Finding and fixing new blocking, deadlock problems etc.
2. Improving latency comparing to stable (2.4.4) version.
3. Improving audio quality scores comparing to 2.6

This is not an issue, just a request. If there were any specific network conditions which you used to optimize the initally provided library, you are welcome to share test sequences as well as your results. e.g.:

->loss(12)->rateControl('32kbit')->networkType('3g')
Stable version: 3.0
My submission: 3.3

->loss(3)->rateControl('64kbit')->after(3)->loss(20)->rateControl('8kbit')->after(3)->rateControl('64kbit')->networkType('3g')
Stable version: 3.2
My submission: 3.4

We will re-check your results and may use the sequences you provide to test other submissions.

While testing with different network conditions faced strange case with ideal connection:

Here are two pairs of logs (caller and callee), same sample, same network conditions:
http://paste.debian.net/1129647/
http://paste.debian.net/1129648/
This one failed.

http://paste.debian.net/1129652/
http://paste.debian.net/1129653/
This one went OK.

And generally the amount of failed calls is higher than with the version we provided. Any ideas what might be the reason?

Could you please clarify what was the purpose of this change?

--- orig/Buffers.h 2019-12-30 11:02:53.000000000 +0000
+++ entry1273/src/libtgvoip/Buffers.h 2020-01-30 10:47:44.171464734 +0000
@@ -200,11 +200,11 @@ namespace tgvoip{
throw std::out_of_range("offset+length out of bounds");
Buffer buf(length);
buf.CopyFrom(other, length, offset);
return buf;
}
- static Buffer Wrap(unsigned char* data, size_t size, std::function<void(void*)> freeFn, std::function<void*(void*, size_t)> reallocFn){
+ static Buffer Wrap(unsigned char* data, size_t size, std::function<void(void*)> freeFn=[](void*){}, std::function<void*(void*, size_t)> reallocFn=[](void*, size_t)->void*{return NULL;}){
Buffer b=Buffer();
b.data=data;
b.length=size;
b.freeFn=freeFn;
b.reallocFn=reallocFn;