Re: [SR-Users] Relaying ACK to Asterisk

24 Sep 2014

Hi!

1. Please post SIP messages in a more readable format. Your dump seems
like Wireshark. Best way to get nice SIP messages is ngrep:

ngrep -t -q -P "" -Wbyline port 5060

Another good method is in Wireshark to activate "display RAW SIP
message" in the SIP protocol dissector options. Then you can right-click
and copy printable characters to the clipboard

2. It seems that Kamailio does not change the port in the RURI. Instead
it copies the whole Route header into the RURI. This is usually only
done when converting from loose-routing to strict routing, or when doing
strict routing. Thus, for some reason it seems that Kamailio has
problems with losse-routing this message.

You have to set the log level to "debug" and then watch the log message
when routing the ACK. You should see some message be lr module how it
routes the message. (there are a plenty of " == myself" messages when
Kamailio tries to find out if a message is addressed to itself, eg if
the URI in the Route header is itself - this may indicate errors in the
alias= config).

regards
Klaus

On 23.09.2014 17:34, Igor Potjevlesch wrote:
...
  Hello Klaus,

 Initial ACK sent by the UAC looks like this:

 Request-Line: ACK sip:700ABCDEFGHIJ@<IP_ASTERISK/KAMAILIO>:4060 SIP/2.0
         Method: ACK
         Request-URI: sip:700ABCDEFGHIJ@<IP_ASTERISK/KAMAILIO>:4060

 Message Header
         Via: SIP/2.0/UDP <IP_UAC>:5060;branch=z9hG4bK-8b319388;rport
             Transport: UDP
             Sent-by Address: <IP_UAC>
             Sent-by port: 5060
             Branch: z9hG4bK-8b319388
             RPort: rport
         From:  22 <sip:ABCDEFGHIJ@sip.fqdn.tld>;tag=189f3d3bf3f9656o0
             SIP Display info:  22 
             SIP from address: sip:ABCDEFGHIJ@sip.fqdn.tld
                 SIP from address User Part: ABCDEFGHIJ
                 SIP from address Host Part: sip.fqdn.tld
             SIP from tag: 189f3d3bf3f9656o0
         To: <sip:123@sip.fqdn.tld>;tag=as091754f8
             SIP to address: sip:123@sip.fqdn.tld
                 SIP to address User Part: 123
                 SIP to address Host Part: sip.fqdn.tld
             SIP to tag: as091754f8
         Call-ID: 39fe9b57-95f574a2@<IP_UAC>
         CSeq: 102 ACK
             Sequence Number: 102
             Method: ACK
         Max-Forwards: 70
         Route: <sip:<IP_ASTERISK/KAMAILIO>;lr=on>
             Route URI: sip:<IP_ASTERISK/KAMAILIO>;lr=on
                 Route Host Part: <IP_ASTERISK/KAMAILIO>
                 Route URI parameter: lr=on
         Proxy-Authorization: Digest

username="ABCDEFGHIJ",realm="sip.fqdn.tld",nonce="VCGIx1Qhh5sqtS7GwGWBKTLvJX

7H3Oqe",uri="sip:123@sip.fqdn.tld",algorithm=MD5,response="103a027b58eb628ea
 003dd827ea1d669"
             Authentication Scheme: Digest
             Username: "ABCDEFGHIJ"
             Realm: "sip.fqdn.tld"
             Nonce Value: "VCGIx1Qhh5sqtS7GwGWBKTLvJX7H3Oqe"
             Authentication URI: "sip:123@sip.fqdn.tld"
             Algorithm: MD5
             Digest Authentication Response:
 "103a027b58eb628ea003dd827ea1d669"
         Contact:  22 <sip:ABCDEFGHIJ@<IP_UAC>:5060>
             SIP Display info:  22 
             Contact URI: sip:ABCDEFGHIJ@<IP_UAC>:5060
                 Contact URI User Part: ABCDEFGHIJ
                 Contact URI Host Part: <IP_UAC>
                 Contact URI Host Port: 5060
         User-Agent: Linksys/WRP400-2.00.32
         Content-Length: 0

 Next, the ACK on lo interface who loops:
 User Datagram Protocol, Src Port: 5060 (5060), Dst Port: 5060 (5060) <--
 here the Dst Port has already been modified by Kamailio.

 Session Initiation Protocol (ACK)
     Request-Line: ACK sip:<IP_ASTERISK/KAMAILIO>;lr=on SIP/2.0
 Method: ACK
         Request-URI: sip:<IP_ASTERISK/KAMAILIO>;lr=on
             Request-URI Host Part: <IP_ASTERISK/KAMAILIO>
 Message Header
         Via: SIP/2.0/UDP
 <IP_ASTERISK/KAMAILIO>;branch=z9hG4bKe717.d7d6c57a10035735c483450629da8b62.0
             Transport: UDP
             Sent-by Address: <IP_ASTERISK/KAMAILIO>
             Branch: z9hG4bKe717.d7d6c57a10035735c483450629da8b62.0
         Via: SIP/2.0/UDP <IP_UAC>:5060;branch=z9hG4bK-2182fea0;rport=5060
             Transport: UDP
             Sent-by Address: <IP_UAC>
             Sent-by port: 5060
             Branch: z9hG4bK-2182fea0
             RPort: 5060
         From:  22 <sip:ABCDEFGHIJ@sip.fqdn.tld>;tag=8ab714d39e8cfdefo0
             SIP Display info:  22 
             SIP from address: sip:ABCDEFGHIJ@sip.fqdn.tld
                 SIP from address User Part: ABCDEFGHIJ
                 SIP from address Host Part: sip.fqdn.tld
             SIP from tag: 8ab714d39e8cfdefo0
         To: <sip:123@sip.fqdn.tld>;tag=as116ed4ed
             SIP to address: sip:123@sip.fqdn.tld
                 SIP to address User Part: 123
                 SIP to address Host Part: sip.fqdn.tld
             SIP to tag: as116ed4ed
         Call-ID: 66c39a3-eb259f5f@<IP_UAC>
         CSeq: 102 ACK
             Sequence Number: 102
             Method: ACK
         Max-Forwards: 69
         Proxy-Authorization: Digest

username="ABCDEFGHIJ",realm="sip.fqdn.tld",nonce="VCGI/FQhh9AbPlF1XLMvEaetTC

aGX9CM",uri="sip:123@sip.fqdn.tld",algorithm=MD5,response="55ca32ecf5ab7b328
 95fd2e545d7033c"
             Authentication Scheme: Digest
             Username: "ABCDEFGHIJ"
             Realm: "sip.fqdn.tld"
             Nonce Value: "VCGI/FQhh9AbPlF1XLMvEaetTCaGX9CM"
             Authentication URI: "sip:123@sip.fqdn.tld"
             Algorithm: MD5
             Digest Authentication Response:
 "55ca32ecf5ab7b32895fd2e545d7033c"
         Contact:  22 <sip:ABCDEFGHIJ@<IP_UAC>:5060>
             SIP Display info:  22 
             Contact URI: sip:ABCDEFGHIJ@<IP_UAC>:5060
                 Contact URI User Part: ABCDEFGHIJ
                 Contact URI Host Part: <IP_UAC>
                 Contact URI Host Port: 5060
         User-Agent: Linksys/WRP400-2.00.32
         Content-Length: 0

 Regards,

 Igor.

 -----Message d'origine-----
 De : sr-users-bounces(a)lists.sip-router.org
 [mailto:sr-users-bounces@lists.sip-router.org] De la part de Klaus Darilion
 Envoyé : mardi 23 septembre 2014 16:04
 À : Kamailio (SER) - Users Mailing List
 Objet : Re: [SR-Users] Relaying ACK to Asterisk

 dump the whole ACK packet received by Kamailio, and the packet looped by
 Kamailio

 regards
 Klaus

 On 20.08.2014 18:38, Igor Potjevlesch wrote:
  Hello,

 I’m having trouble with this scenario (Kamailio and Asterisk are 
 working on the same server, Asterisk listens on 4060 instead of 5060): 
 the UAC sends an ACK request with the following R-URI:
 sip:955*95%23@<IP_ASTERISK/KAMAILIO>:4060
 <sip:955*95%23@%3cIP_ASTERISK/KAMAILIO%3e:4060>.

 When I’m doing a capture on loopback interface, I just see an ACK 
 request from IP <IP_ASTERISK/KAMAILIO>:5060 to IP 
 <IP_ASTERISK/KAMAILIO>:5060.

 So the ACK seems to loop inside Kamailio.

 What could explain that the good port defined by the UAC is deleted?

 Regards,

 Igor.

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 _______________________________________________
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 _______________________________________________
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Re: [SR-Users] Relaying ACK to Asterisk