[SR-Users] Altering received parameter in Contact

[Alex Balashov]

I don't see any issues with it, no...

On Wed, Jan 30, 2019 at 01:06:40PM +1300, David Cunningham wrote:

> Hi Alex,
> 
> We already had this line in our kamailio.cfg:
> modparam( "nathelper|registrar", "received_avp", "$avp(RECEIVED)" )
> 
> We do need to change the received parameter conditionally depending on the
> user agent, and the following seems to work:
> if ( $ua =~ "ewb2bua" ) {
>     avp_subst( "$avp(RECEIVED)", "/(.*);transport=TLS/\1/i" );
> }
> 
> Can you see any issues with this?
> 
> Thank you!
> 
> 
> On Wed, 30 Jan 2019 at 10:50, David Cunningham <dcunningham at voisonics.com>
> wrote:
> 
> > Hello everyone who replied, and thank you for your advice! We will try the
> > suggestions given.
> >
> >
> > On Wed, 30 Jan 2019 at 01:34, Alex Balashov <abalashov at evaristesys.com>
> > wrote:
> >
> >> Hi David,
> >>
> >> Well, the registrar's 200 OK should include the very Contact binding
> >> that was stored for the given AOR, and for a TLS registrant, that's
> >> going to unavoidably contain the ;transport=TLS attribute, because TLS
> >> is not the default presumed transport in the absence of a ;transport
> >> attribute.
> >>
> >> If the issue is specifically with the occurrence of ;transport=TLS in
> >> the 'received' parameter, that can be modulated here:
> >>
> >>
> >> https://kamailio.org/docs/modules/5.2.x/modules/registrar.html#registrar.p.received_param
> >>
> >> And if it needs to be controlled on a situational/per-registration
> >> basis, one can use the AVP:
> >>
> >>
> >> https://kamailio.org/docs/modules/5.2.x/modules/registrar.html#registrar.p.received_avp
> >>
> >> If you set it to empty for a registration from a certain type of device,
> >> the parameter will not be populated and thus not reflected back to the
> >> registering UA.
> >>
> >> -- Alex
> >>
> >> On Tue, Jan 29, 2019 at 03:28:38PM +1300, David Cunningham wrote:
> >>
> >> > Hello,
> >> >
> >> > I'm hoping someone can give advice on altering the received parameter in
> >> > the Contact header on a reply. The situation is that a customer is
> >> > REGISTERing using TLS, and our Kamailio replies with a 200 OK that
> >> includes
> >> > a Contact header like this:
> >> >
> >> > Contact: <sip:123456789 at xx.xx.102.10
> >> >
> >> :5061;transport=tls>;expires=3600;received="sip:xx.xx.102.10:36051;transport=TLS"
> >> >
> >> > The customer's device apparently had an issue with this, and the device
> >> > manufacturer advises that they need the ";transport=TLS" on the received
> >> > parameter removed. This sounds like a strange requirement, but it's what
> >> > we've been told. Does anyone know how to alter this in a Kamailio
> >> > configuration?
> >> >
> >> > Our system uses www_authorize to authenticate and is running Kamailio
> >> 4.2.1.
> >> >
> >> > Thanks in advance for any help!
> >> >
> >> > --
> >> > David Cunningham, Voisonics Limited
> >> > http://voisonics.com/
> >> > USA: +1 213 221 1092
> >> > New Zealand: +64 (0)28 2558 3782
> >>
> >> > _______________________________________________
> >> > Kamailio (SER) - Users Mailing List
> >> > sr-users at lists.kamailio.org
> >> > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
> >>
> >>
> >> --
> >> Alex Balashov | Principal | Evariste Systems LLC
> >>
> >> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> >> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
> >>
> >> _______________________________________________
> >> Kamailio (SER) - Users Mailing List
> >> sr-users at lists.kamailio.org
> >> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users
> >>
> >
> >
> > --
> > David Cunningham, Voisonics Limited
> > http://voisonics.com/
> > USA: +1 213 221 1092
> > New Zealand: +64 (0)28 2558 3782
> >
> 
> 
> -- 
> David Cunningham, Voisonics Limited
> http://voisonics.com/
> USA: +1 213 221 1092
> New Zealand: +64 (0)28 2558 3782

> _______________________________________________
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> sr-users at lists.kamailio.org
> https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users


-- 
Alex Balashov | Principal | Evariste Systems LLC

Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) 
Web: http://www.evaristesys.com/, http://www.csrpswitch.com/