[OpenSIPS-Users] Android can't here voice over the LTE.

[kamika]

When you work with opensips in most cases you cannot use it out of the box
like Asterisk or Freeswitch. You have to learn at least how to record SIP
traces, read and understand SIP flow, understand what opensips.cfg does.
There is a few programs that can record traces - I am personally use tcpdump
and read them in Wireshark using its powerfull voip tools.  When you are
able to discover what happend in trace, you can understand where the problem
is hidden whether it nat of network issues. 



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