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

[Dave Singer]

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.
>
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