[SR-Users] t_suspend / t_continue & insert_hf

[Federico Cabiddu]

Hi Fuad,
without going too far in kamailio's internals, a resume route is equivalent
to a failure route and, as such, it operates on a "fake" fresh message.
One solution is to use msg_apply_changes() but my general advice is that
all headers and sdp mangling (aka rtpengine invocations) should be done in
branch routes, especially if your routing logic includes
async routes/failure routes.

Federico



On Mon, Mar 28, 2022 at 1:20 PM Fuad Trle <trle.fuad at gmail.com> wrote:

> Hi Henning,
>
> I have tried this, but without success. *This function can be used from
> REQUEST_ROUTE or core REPLY_ROUTE.* t_newtrans & http_async_query force
> me to enter a new routing block and call fail with "500 I'm terribly sorry,
> server error occurred (1/TM)". There is no explicit exit at the end of
> route(HTTP) but for some reason execution stopped and did not continue in
> request_route.
>
> I don't think I can fulfil those requirements (call function in request
> route and before record_route). Suspend is the last option (after location
> lookup and parallel forking).
>
> On Sun, Mar 27, 2022 at 10:51 PM Henning Westerholt <hw at gilawa.com> wrote:
>
>> Hello,
>>
>>
>>
>> if you are not seeing them in the configuration later on directly, this
>> is expected:
>> https://www.kamailio.org/wiki/tutorials/faq/main#why_changes_made_to_headers_or
>>
>>
>>
>> Cheers,
>>
>>
>>
>> Henning
>>
>>
>>
>> --
>>
>> Henning Westerholt – https://skalatan.de/blog/
>>
>> Kamailio services – https://gilawa.com
>>
>>
>>
>> *From:* sr-users <sr-users-bounces at lists.kamailio.org> *On Behalf Of *Fuad
>> Trle
>> *Sent:* Friday, March 25, 2022 4:08 PM
>> *To:* sr-users at lists.kamailio.org
>> *Subject:* [SR-Users] t_suspend / t_continue & insert_hf
>>
>>
>>
>> Hello,
>>
>>
>>
>> I'm inserting some headers after getting value from http_async_query. If
>> a call is relayed, I see them. But If I t_suspend and t_continue call
>> (before time out), I do not see added headers. Here is flow:
>>
>>
>>
>> route(START)
>>
>> t_newtran();
>>
>> #.. prep for query
>>
>> http_async_query("url","HTTP");
>>
>>
>>
>> route(HTTP)
>>
>> #.. collect and using data from query
>>
>> insert_hf("$var(key): $var(value)\r\n");
>>
>> t_store();
>>
>>
>>
>> if (registered("location") {
>>
>>     route(RELAY);
>>
>> } else {
>>
>>     t_suspend();
>>
>>     exit;
>>
>> }
>>
>>
>>
>> route(AWAKE)
>>
>> t_continue();
>>
>>
>>
>> I see that the branch index ($T_branch_idx) is 0 at start. 1 after http
>> query, +1 if there is forking or location. +1 after t_suspend. It looks
>> like t_continue uses a branch with index after t_suspend. I tried with
>> t_save_lumps() to carry over changes.
>>
>>
>>
>> Any idea how to do this?
>>
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