[SR-Users] IMS RX AAR issues

[Pafel]

Hello,

I am using kamailio 5.3 + rtpengine module + sipwise rtpengine in a IMS
test environment. I have and issue with ims_qos module and Rx AAR command.

PCSCF is configured with
#!define WITH_RX


##!define WITH_RX_REG
#!define WITH_RX_CALL

I have 2 test phones connected. Both of them use ipv6.
PCSCF has ipv4 and ipv6 address.
All other nodes - SCSCF, ICSCF use ipv4.

Simple scenario UE1 calls UE2. UE2 is replying with 183 session progress
and then RX AAR is sent by PCSCF to PCRF/PGW. The problem is that AVPs
Media-Sub-Component Flow-Description include ipv4 address of the proxy and
ipv6 address of the UE.

Example:
permit out 17 from 192.168.1.1 34998 to fd18::1:2dca:3303:1286:257d 50010
permit in 17 from fd18::1:2dca:3303:1286:257d 50010 to 192.168.1.1 34998

But this is not acceptable for the PGW (different ip versions).
The SDP between UE and PCSCF is rewritten by rtpengine/sipwise. Looking at
the ims_qos module I found that the address of the proxy is taken from the
session original request SDP media ip/port. Having in mind that
rtpengine/sipwise proxy is rewritting it is there any way I can set the
correct ipv6 address and port of the proxy?

I've tried to get the rewritten media address from SDP (in logs) but
without success:
if(sdp_get_line_startswith("$avp(cline)", "c=")) {
xlog("L_INFO", "SDP media ip: $(avp(cline){s.select,2, })\n");
}
if(sdp_get_line_startswith("$avp(mline)", "m=")) {


xlog("L_INFO", "SDP media port: $(avp(mline){s.select,1, })\n");
}
I am always getting the ipv4 media address and port of the proxy.

Any idea how I can set and use the rewritten by the rtpengine/sipwise media
ip and proxy for the RX AAR?

Thanks in advance,
Pavel Siderov
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