Mikrotik 220.127.116.11 has created under ESXI and gives DHCP to Kolmi Mor (asterisk pbx) 192.168.163.254 (static)
voip ports + rtp forwarded to Mor
because voip is totaly blocked so my raspbx can not register to Mor
so my target is using pptp server at 18.104.22.168 & client at Mikrotik 192.168.2.1
Mikrotik 192.168.2.1 now connected by pptp client to Mikrotik 22.214.171.124
after using mangle now pptp traffic routed to raspbx 192.168.2.140
raspbx behind Mikrotik at local lan registered to 192.168.163.254 (Kolmi Mor) once pptp connected [as noticed 5060 forwarded to 192.168.163.254]
from iphone client at the other side i can make voip calls and can reach raspbx
the problem : sound is very bad !!!
i tried using other tunnels protocols vpn (l2tp + sstp + Ovpn) all works and with normal sound (sstp&Ovpn have little high ping but works)
but once i use pptp it works but with very bad sound
i found only one strange solution and works with me and fixed bad sound !!!!
from raspbx cli i installed mtr
once i run command at raspbx cli ( mtr 192.168.163.254 or mtr google.com) Sound become super !!!!!!!!!!!
in case i close running mtr command sound back very bad with pptp
issue happen only with pptp protocol
i run mikrotik 6.38.1
How to fix this issue permanently ?