[OpenSIPS-Users] How to modify the 100 Trying packet

[Tyler Merritt]

Dave,

Thanks for your reply.  I see you reply a lot and I appreciate you taking
the time to help us.

I read the page you linked - and I've stumbled across that before, but it's
not what I want to do sadly :(

The carrier basically wants me to strip the "Server" header from the 100
message.  That's it - if this message went through the routing logic, I
could just "remove_hf("Server");" but alas...

I've told them this is a no-go for now.  Seems that we would have to modify
the OpenSIPs core to make it happen.  Not worth the time or effort for this
reason.


On Tue, Feb 8, 2011 at 3:10 AM, Dave Singer <dave.singer at wideideas.com>wrote:

> The 100 Trying is sent out to the originating server/user
> automatically when you send the invite off to the next destination
> with t_relay and exit in the main routing script.
> The 100 Trying you receive in the on_reply is just to let you know
> that the next hop is not dead and it is working on it. Your server
> only uses it for it's timeout for the call to that server.
> See the optional flags in the t_relay docs:
> http://www.opensips.org/html/docs/modules/1.4.x/tm.html#id271564
> That should get you going.
> FYI if (is_method("TRYING")) would always be false since the method is
> INVITE and the status message would be Trying or "Giving a try" or
> something else. Never count on the status message, just the code.
> Different servers send back different messages. Unless you are
> factoring that in.
> I think you actually might be looking for fix_nated_contact. Check
> that out. Depends on what you are trying to accomplish.
>
> Dave
>
> On Mon, Feb 7, 2011 at 3:48 AM, Tyler Merritt <tyler at fonality.com> wrote:
> > This started working - but the problem is that it's matching both sides
> of
> > the conversation.  I'm searching for a concrete method to say "only if
> > you're going to send this packet to the upstream provider" but the
> closest I
> > found was "is_destination" which has to be called from loose_route, and
> > unfortunately it looks like we don't have any HF setup for this
> particular
> > situation, so loose_route always returns 0 and exits (confirmed in the
> > logs).
> > The provider won't let me add stuff - maybe I can just add stuff one-way
> > then rip it off on the return?
> > if (is_method("INVITE") && status=="200" &&
> $(ct.fields(uri){s.substr,4,12})
> > !~ '^8150*') {
> >                                 xlog("L_INFO", "Modifying the outbound
> > Contact header to Carrier...  $(ct.fields(uri){s.substr,5,12})");
> >
> >  subst('/^Contact:(.*)sip:[^@]*@[a-zA-Z0-9.]+(.*)$/Contact:
> > <sip:$avp(oriUri)@192.168.0.2>/ig');
> > }
> > Any tips?
> > On Mon, Feb 7, 2011 at 11:19 AM, Tyler Merritt <tyler at fonality.com>
> wrote:
> >>
> >> I have used "if (status=="100")" and "if (is_method("TRYING"))" and
> placed
> >> these in a variety of places, at the top of route[0], in route[1], in
> >> onreply_route (where it actually works), but nowhere can I get the
> OUTGOING
> >> 100 TRYING packet to change...
> >> I can't figure this out - there isn't very good documentation
> surrounding
> >> this particular packet, and if I were to guess, I would say that the
> method
> >> is hard-coded somewhere in the routing module.
> >> Any pointers on where this packet might be modified before sending it to
> >> the upstream provider would be welcome.
> >
> > _______________________________________________
> > Users mailing list
> > Users at lists.opensips.org
> > http://lists.opensips.org/cgi-bin/mailman/listinfo/users
> >
> >
>
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