There is a Asterisk server. It is connected Tifon. The problem is that when an incoming call intermittent audible companion, and I heard no problems. As the gateway Mikrotik. Udp and tcp ports prekinuti, sip alg was turned off (does not help), the range of rtp ports 5000-20000.
Googling turned in iax.conf, jitterbuffer=yes trunktimestamps=yes
Codecs ulaw and alaw. Internet connection 50 megabit, not loaded.
Settings PIR tifon:
The most interesting that when I call tifon, you can hear great.
What else to see and how to solve the problem?