Get destination IP from forwarded invite - sr-users

16 Jan 2020

Hi all,

I'm a newbie for Kamailio and working on a feature needs end-users' destination IP
in the first transferred/forwarded invite message.

Basically, our system/call flow is like:
ClientA -> Kamailio1 -> Kamailio2 -> ClientB

Invite from the clientA:

tls:212.252.34.165:32980
tls:172.21.193.100:5061
INVITE sip:905364167881@testsip.tvoip.turkcell.com.tr:443 SIP/2.0
Via: SIP/2.0/TLS 100.64.13.139:56993;branch=z9hG4bK.GoiTxA4Ee;rport
From: <sip:905368601286@testsip.tvoip.turkcell.com.tr>;tag=WbINy0ypx
To: sip:905364167881@testsip.tvoip.turkcell.com.tr
CSeq: 20 INVITE
...

Needed Ip (Client B's IP 10.252.180.51 for this case) is in the INVITE row of the
forwarded message.

Invite to the Kamailio2 :

udp:172.21.193.100:5060
udp:172.21.193.98:5060
INVITE sip:905364167881@10.252.180.51:36945;transport=tls SIP/2.0
Record-Route: <sip:gearbox11.turkcell.tgc:5060;r2=on;lr;did=7f5.f572;nat=yes>
Record-Route:
<sip:testsip05.tvoip.turkcell.com.tr:443;transport=tls;r2=on;lr;did=7f5.f572;nat=yes>
Via: SIP/2.0/UDP
gearbox11.turkcell.tgc:5060;branch=z9hG4bK67ad.4e8e863f2475ab8d3053af0593548557.1;i=f
Via: SIP/2.0/TLS
100.64.13.139:56993;received=212.252.34.165;branch=z9hG4bK.1SYkXD1Me;rport=32980
From: <sip:905368601286@testsip.tvoip.turkcell.com.tr>;tag=WbINy0ypx
To: sip:905364167881@testsip.tvoip.turkcell.com.tr
CSeq: 21 INVITE
...

When the first invite message receives, the dialog variables or sel(msg...) parsed values
belong to this first received message, as far as I understand during the tests. However I
need the forwarded invite message's variables. Even after t_relay in RELAY route, it
looks the message I have is the first one. So, I cannot reach this later IP in the
forwarded invite message. As far as I understand, bear with me here please, this IP
manipulation executes in t_relay function and in the C side of Kamailio. So, I cannot find
a way to do that in the our native scripts.

Is there any way to get it without diving C code's abyss? Do you have any idea about
it? I would appreciate it, if I can get any help or any clue.

Thanks for all...

S. Cumhur Karahan

[http://s.turkcell.com.tr/SiteAssets/Genel/mail-imza.jpg]
<http://turkcell.li/ncfYh>

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gerekmektedir.

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