[SIPForum-discussion] Duplication of SIP Header

Keerthi Srinivasan keerthivarmansrinivasan at gmail.com
Wed Nov 30 13:48:09 UTC 2011 

Hi All,

If the SIP stack receives the duplication Mandatory SIP Header then the SIP
will send failure response or successful response.

Ex:
Scenario 1:

Registrar receives the REGISTER request with *duplication of multiple From
Header like*
       REGISTER sip:registrar.biloxi.com SIP/2.0
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Max-Forwards: 70
       To: Bob <sip:bob at biloxi.com>
       From: Bob <sip:bob at biloxi.com>;tag=456248
       From: Bob <sip:bob at biloxi.com>;tag=456248
       From: Bob <sip:bob at biloxi.com>;tag=456248
       From: Bob <sip:bob at biloxi.com>;tag=456248
       From: Bob <sip:bob at biloxi.com>;tag=456248
       Call-ID: 843817637684230 at 998sdasdh09
       CSeq: 1826 REGISTER
       Contact: <sip:bob at 192.0.2.4>
       Expires: 7200
       Content-Length: 0

Scenario 2:

Registrar receives the REGISTER request with *duplication of multiple To
Header *

       REGISTER sip:registrar.biloxi.com SIP/2.0
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Max-Forwards: 70
       To: Bob <sip:bob at biloxi.com>
       To: Bob <sip:bob at biloxi.com>
       To: Bob <sip:bob at biloxi.com>
       To: Bob <sip:bob at biloxi.com>
       To: Bob <sip:bob at biloxi.com>
       To: Bob <sip:bob at biloxi.com>
       From: Bob <sip:bob at biloxi.com>;tag=456248
       Call-ID: 843817637684230 at 998sdasdh09
       CSeq: 1826 REGISTER
       Contact: <sip:bob at 192.0.2.4>
       Expires: 7200
       Content-Length: 0

Scenario 3:

Registrar receives the REGISTER request with *duplication of multiple Via
Header *

       REGISTER sip:registrar.biloxi.com SIP/2.0
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Max-Forwards: 70
       To: Bob <sip:bob at biloxi.com>
       From: Bob <sip:bob at biloxi.com>;tag=456248
       Call-ID: 843817637684230 at 998sdasdh09
       CSeq: 1826 REGISTER
       Contact: <sip:bob at 192.0.2.4>
       Expires: 7200
       Content-Length: 0

Scenario 4:

Registrar receives the REGISTER request with* duplication of multiple
Call-ID Header *

       REGISTER sip:registrar.biloxi.com SIP/2.0
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Max-Forwards: 70
       To: Bob <sip:bob at biloxi.com>
       From: Bob <sip:bob at biloxi.com>;tag=456248
       Call-ID: 843817637684230 at 998sdasdh09
       Call-ID: 843817637684230 at 998sdasdh09
       Call-ID: 843817637684230 at 998sdasdh09
       Call-ID: 843817637684230 at 998sdasdh09
       Call-ID: 843817637684230 at 998sdasdh09
       CSeq: 1826 REGISTER
       Contact: <sip:bob at 192.0.2.4>
       Expires: 7200
       Content-Length: 0

Scenario 5:

Registrar receives the REGISTER request with *duplication of multiple Cseq
Header *

       REGISTER sip:registrar.biloxi.com SIP/2.0
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Max-Forwards: 70
       To: Bob <sip:bob at biloxi.com>
       From: Bob <sip:bob at biloxi.com>;tag=456248
       Call-ID: 843817637684230 at 998sdasdh09
       CSeq: 1826 REGISTER
       CSeq: 1826 REGISTER
       CSeq: 1826 REGISTER
       CSeq: 1826 REGISTER
       CSeq: 1826 REGISTER
       Contact: <sip:bob at 192.0.2.4>
       Expires: 7200
       Content-Length: 0

Scenario 6:

Registrar receives the REGISTER request with *duplication of multiple
Max-Forwards Header *

       REGISTER sip:registrar.biloxi.com SIP/2.0
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Max-Forwards: 70
       Max-Forwards: 70
       Max-Forwards: 70
       Max-Forwards: 70
       Max-Forwards: 70
       To: Bob <sip:bob at biloxi.com>
       From: Bob <sip:bob at biloxi.com>;tag=456248
       Call-ID: 843817637684230 at 998sdasdh09
       CSeq: 1826 REGISTER
       Contact: <sip:bob at 192.0.2.4>
       Expires: 7200
       Content-Length: 0


Scenario 6:

Registrar receives the REGISTER request with *duplication of multiple
Expires: Header *

       REGISTER sip:registrar.biloxi.com SIP/2.0
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Max-Forwards: 70
       To: Bob <sip:bob at biloxi.com>
       From: Bob <sip:bob at biloxi.com>;tag=456248
       Call-ID: 843817637684230 at 998sdasdh09
       CSeq: 1826 REGISTER
       Contact: <sip:bob at 192.0.2.4>
       Expires: 7200
       Expires: 7200
       Expires: 7200
       Expires: 7200
       Expires: 7200
       Content-Length: 0


Scenario 7:

Registrar receives the REGISTER request with *duplication of multiple
Content-Length Header *

       REGISTER sip:registrar.biloxi.com SIP/2.0
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Max-Forwards: 70
       To: Bob <sip:bob at biloxi.com>
       From: Bob <sip:bob at biloxi.com>;tag=456248
       Call-ID: 843817637684230 at 998sdasdh09
       CSeq: 1826 REGISTER
       Contact: <sip:bob at 192.0.2.4>
       Expires: 7200
       Content-Length: 0
       Content-Length: 0
       Content-Length: 0
       Content-Length: 0
       Content-Length: 0
       Content-Length: 0


Scenario 8:

Registrar receives the REGISTER request with *duplication of multiple
request-line Header *

       REGISTER sip:registrar.biloxi.com SIP/2.0
       REGISTER sip:registrar.biloxi.com SIP/2.0
       REGISTER sip:registrar.biloxi.com SIP/2.0
       REGISTER sip:registrar.biloxi.com SIP/2.0
       REGISTER sip:registrar.biloxi.com SIP/2.0
       REGISTER sip:registrar.biloxi.com SIP/2.0
       Via: SIP/2.0/UDP bobspc.biloxi.com:5060;branch=z9hG4bKnashds7
       Max-Forwards: 70
       To: Bob <sip:bob at biloxi.com>
       From: Bob <sip:bob at biloxi.com>;tag=456248
       Call-ID: 843817637684230 at 998sdasdh09
       CSeq: 1826 REGISTER
       Contact: <sip:bob at 192.0.2.4>
       Expires: 7200
       Content-Length: 0

Please anyone can say, how registrar will respond for the above message.

Thanks in advance.


-- 
Regards,
Keerthi
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