call fail in kamailio-docker while succeed in v532

[lglhust]

@herlesupreeth
Hi Supreeth, some type of commercial lte mobile calls failed in kamailio install by docker, but can succeed in kamailio-v532(previous version made by you , https://github.com/herlesupreeth/kamaili) .
The environment is the same , except the version of kamailio.

In kamailio install by docker the calls failed , i noticed the port of PRACK packet from UE maybe not compatible for the pcscf , and pcscf may drop the packet. In the capture file :
Pcscf send PRACK to UE: src port 5104, dst port 42192
UE reply 200 ok(PRACK) to pcscf: src port 42699, dst port 5104

in 401 for registration, pcscf: port-c: 5104 port-s: 6104
in registration request, UE: port-c: 42699 port-s: 42192

While in early version, https://github.com/herlesupreeth/kamailio, the call is success.
The port in 200 ok(PRACK) to pcscf is right.

I compared the packet ,but i cannot find the cause. I guess there is some hide bug in dealing with the udp port in kamailio version from docker.
Please help here to clarify. The attached file is the packet of call fail and success.
Thanks.

Best wishes,
call.zip

[herlesupreeth]

The reason its failing is because your UE is sending SIP packets to IPSec ports without encapsulating in ESP header