[Kamailio-Devel] More about URI port and URI parameters when comparing SIP URI's

[Iñaki Baz Castillo]

Hi, I remember a long thread about SIP URI comparisions. We talked about if a 
port present in a From/To SIP URI should be matched or not when comparing 
that URI with other.

Well, the fact is that port is *not allowed* in From/To headers, as Table 1 
states in RFC 3261 (pag 151):


                                                       dialog
                                          reg./redir. Contact/
              default  Req.-URI  To  From  Contact   R-R/Route  external
user          --          o      o    o       o          o         o
password      --          o      o    o       o          o         o
host          --          m      m    m       m          m         m
port          (1)         o      -    -       o          o         o
user-param    ip          o      o    o       o          o         o
method        INVITE      -      -    -       -          -         o
maddr-param   --          o      -    -       o          o         o
ttl-param     1           o      -    -       o          -         o
transp.-param (2)         o      -    -       o          o         o
lr-param      --          o      -    -       -          o         o
other-param   --          o      o    o       o          o         o
headers       --          -      -    -       o          -         o

   (1): The default port value is transport and scheme dependent.  The
   default  is  5060  for  sip: using UDP, TCP, or SCTP.  The default is
   5061 for sip: using TLS over TCP and sips: over TCP.

   (2): The default transport is scheme dependent.  For sip:, it is UDP.
   For sips:, it is TCP.

   Table 1: Use and default values of URI components for SIP header
   field values, Request-URI and references



Also, in pag 150 it appears:

   Entries marked "m" are mandatory, those
   marked "o" are optional, and those marked "-" are not allowed.
   Elements processing URIs SHOULD ignore any disallowed components if
   they are present. 


Under my understanding this means that the following URI's in a From headers 
are all equal when comparing them:

  From: <sip:user at domain.org:5060;myparam=qwe>;tag=1111
  From: <sip:user at domain.org:9999;myparam2=rty>;tag=2222
  From: <sip:user at domain.org;myparam3=qweuio;tag=3333


They are equivalent since port must be ignored when comparing URI's in From/To 
headers (according to the table above).




-- 
Iñaki Baz Castillo