[SR-Users] path use_received not working?

Fri Jul 21 12:22:03 CEST 2017

Hi Daniel,
Yes, those headers are extracted from a wireshark pcap.
Yes, kamailio is listening on a public IP address without any sort of NAT.

Here's the REGISTER sent from kamailio to FreeSWITCH, copied from a pcap 
using wireshark with IPs replaced:

Session Initiation Protocol (REGISTER)
     Request-Line: REGISTER sip:sip.test.com:5060 SIP/2.0
         Method: REGISTER
         Request-URI: sip:sip.test.com:5060
             Request-URI Host Part: sip.test.com
             Request-URI Host Port: 5060
         [Resent Packet: False]
     Message Header
         Record-Route: <sip:KAMAILIO_PUBLIC_IP;lr=on;ftag=1015994109>
         Via: SIP/2.0/UDP 
KAMAILIO_PUBLIC_IP;branch=z9hG4bKb4a9.4cbfa8e6cdc8083ffe5ff1ea228fea26.0
         Via: SIP/2.0/UDP 
192.168.1.200:5063;rport=5063;received=UAC_PUBLIC_IP;branch=z9hG4bK332629336
         From: <sip:1001 at sip.test.com>;tag=1015994109
         To: <sip:1001 at sip.test.com>
         Call-ID: 1821101462 at 192.168.1.200
         CSeq: 1 REGISTER
         Contact: <sip:1001 at 192.168.1.200:5063>
         Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, 
REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE, MESSAGE
         Max-Forwards: 69
         User-Agent: Yealink SIP-T42G 29.72.23.5
         Expires: 3600
         Allow-Events: talk,hold,conference,refer,check-sync
         Content-Length: 0
         Path: <sip:KAMAILIO_PUBLIC_IP;lr;received=sip:UAC_PUBLIC_IP:5063>
             Path URI: 
sip:KAMAILIO_PUBLIC_IP;lr;received=sip:UAC_PUBLIC_IP:5063
                 Path Host Part: KAMAILIO_PUBLIC_IP
                 Path URI parameter: lr
                 Path URI parameter: received=sip:UAC_PUBLIC_IP:5063

And this is the test INVITE from FreeSWITCH to kamailio:

Session Initiation Protocol (INVITE)
     Request-Line: INVITE sip:1001 at 192.168.1.200:5063 SIP/2.0
     Message Header
         Via: SIP/2.0/UDP 
FREESWITCH_PUBLIC_IP;rport;branch=z9hG4bK543jg8S9Ng8gm
         Route: <sip:KAMAILIO_PUBLIC_IP>;lr;received=sip:UAC_PUBLIC_IP:5063
         Max-Forwards: 70
         From: "" <sip:0000000000 at FREESWITCH_PUBLIC_IP>;tag=DyFB81r40609Q
         To: <sip:1001 at 192.168.1.200:5063>
         Call-ID: fad5ae53-e89d-1235-d8b5-00163e50ea42
         CSeq: 109979488 INVITE
         Contact: <sip:mod_sofia at FREESWITCH_PUBLIC_IP:5060>
         User-Agent: FreeSWITCH-1.6.9-16-d574870~64bit
         Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, 
UPDATE, REGISTER, REFER, NOTIFY, PUBLISH, SUBSCRIBE
         Supported: timer, path, replaces
         Allow-Events: talk, hold, conference, presence, 
as-feature-event, dialog, line-seize, call-info, sla, 
include-session-description, presence.winfo, message-summary, refer
         Content-Type: application/sdp
         Content-Disposition: session
         Content-Length: 319
         X-FS-Support: update_display,send_info
     Message Body
         Session Description Protocol
             Session Description Protocol Version (v): 0
             Owner/Creator, Session Id (o): FreeSWITCH 1500611681 
1500611682 IN IP4 FREESWITCH_PUBLIC_IP
             Session Name (s): FreeSWITCH
             Connection Information (c): IN IP4 FREESWITCH_PUBLIC_IP
             Time Description, active time (t): 0 0
             Media Description, name and address (m): audio 19424 
RTP/AVP 9 0 8 3 101 13
             Media Attribute (a): rtpmap:9 G722/8000
             Media Attribute (a): rtpmap:0 PCMU/8000
             Media Attribute (a): rtpmap:8 PCMA/8000
             Media Attribute (a): rtpmap:3 GSM/8000
             Media Attribute (a): rtpmap:101 telephone-event/8000
             Media Attribute (a): fmtp:101 0-16
             Media Attribute (a): rtpmap:13 CN/8000
             Media Attribute (a): ptime:20

As always, thanks for all your help!

Kind regards,
Iskren

On 21.7.2017 г. 11:42, Daniel-Constantin Mierla wrote:
>
> Hello,
>
> are you sure that the Route is like that? The lr parameter and 
> received should be between angle brakets <> along with the sip uri.
>
> Maybe you should paste here the full REGISTER sent to sip server after 
> adding the path as well as the INVITE received later. You can replace 
> the IP addresses that are sensitive for you, but keel everything else 
> as it is in order to see if there is something wrong in the headers.
>
> Btw, the To header has nothing to do with routing, the R-URI will be 
> also relevant in this case.
>
> Is kamailio listening directly on a public ip?
>
> Cheers,
> Daniel
>
>
> On 20.07.17 17:18, Iskren Hadzhinedev wrote:
>>
>> Hello,
>>
>> I have a kamailio proxy in front of FreeSWITCH.
>>
>> Whenever FreeSWITCH initiates the dialog (e.g. sends an INVITE), 
>> kamailio doesn't use the 'received' parameter and it forwards to the 
>> RFC1918 IP address. The initial INVITE from FreeSWITCH has the 
>> following headers:
>>
>> To: <sip:1001 at 192.168.1.200:5063>
>> Route: <sip:1.2.3.4>;lr;received=sip:5.6.7.8:5063
>>
>> Where 1.2.3.4 is the kamailio public IP and5.6.7.8 is the public IP 
>> of the UAC behind NAT.
>> I have modparam("path", "use_received", 1) in my config file and to 
>> my understanding that should be sufficient to route to the proper IP, 
>> but kamailio keeps sending INVITEs to 192.168.1.200.
>>
>> Can anyone tell me what am I missing?
>> Thanks!
>>
>> Kind regards,
>> Iskren
>>
>>
>> _______________________________________________
>> Kamailio (SER) - Users Mailing List
>> sr-users at lists.kamailio.org
>> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
>
> -- 
> Daniel-Constantin Mierla
> www.twitter.com/miconda  --www.linkedin.com/in/miconda
> Kamailio Advanced Training -www.asipto.com
> Kamailio World Conference -www.kamailioworld.com

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