[SR-Users] how to drop 200ok and survive?

Uri Shacked ushacked at gmail.com
Fri Feb 19 13:27:59 CET 2016


thanks for the quick response.
regarding to the 200 drop, it is less of an issue. i actually tried
t_drop_replies() on the reply_route.
it works only on failure_route.
but, didn't try another on_reply route and drop. i will try. thanks.

still, daniel is right, the main problem is the ACK.
as i wrote, i use uac_req_send() to try and send the asterisk a fake ACK.

i enter the following:

$uac_req(ruri)= "exten at asterisk:5080";
$uac_req(furi)="from at caller.com";
$uac_req(turi)="exten at asterisk:5080" + ";" + "saved_to_tag"

the problem is that the actual ACK sent, is malformed in the TO header.

it is populated as <exten at asterisk:5080;to_tag>
instead of <exten at asterisk:5080>;to_tag

what do you think?


> On 18/02/16 20:35, Uri Shacked wrote:
> > Hi,
> >
> > for some strange reason, ask my regulator.... i need to manipulate
> > certain calls.
> > the scenario goes like this:
> >
> > 1. caller sends invite to kamailio.
> > 2. kamailio transfer the call to asterisk.
> > 3. asterisk send progress and play "hello".
> > 4. asterisk creates a new call (dial) to the same kamailio with
> > destination callee.
> > 5. the callee answers the call.
> >
> > here, i need to block the 200ok. so that the caller does not receive it.
> >
> > i managed to block it with t_suspend().
> > but, there is no bidirectional media.
> > the 183 progress was sent with sendreceive.
> > it seems the asterisk is waiting for the ACK in order to open both
> > ways for media.
> >
> > i tried to use uac_send_req() but it is being sent with no to tag. and
> > when i try manipulating the uac_req(turi) it does not help because it
> > takes all the string i entered and wraps it with <>.
> >
> > any ideas?
> >
> But if asterisk is waiting for ACK, that is not going to happen if you
> drop the 200ok.
> Maybe Asterisk is waiting for PRACK following the 183, can you check the
> Requires header in 183?
> While 200ok can be dropped by having a reply_route with drop for 200ok,
> it doesn't feel like it is solving what you are looking for.
> Cheers,
> Daniel
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