Hello,

htable can be (almost) always a rescue option -- define one with
auto-expire value set to the transaction lifetime, when you know that
next responses should be dropped, then add an item in the htable with
callid as a key (eventually callid+cseq). When you get a response, check
if you have the item in htable and drop it.

Cheers,
Daniel

On 12.03.19 16:15, Marco Capetta wrote:

Hi All,

I started playing with async kamailio feature, in particular using
"async_route" function provided by ASYNC module
(https://www.kamailio.org/docs/modules/5.1.x/modules/async.html#async.f.async_route).

My scenario is the following:
 - A calls B
 - B answer the call
 - inside onreply_route[reply] I catch the 200OK message and I suspend
the transaction for X seconds.
 - after X seconds the transaction is resumed and the call continues
as expected

Everything looks good, but I encountered an issue trying to drop reply
re-transmission messages.

My desire is to drop all the messages received from B (basically 200OK
re-transmissions) meanwhile the transaction is suspended.
I tested "t_is_retr_async_reply" function provided by TM module
(https://www.kamailio.org/docs/modules/5.1.x/modules/tm.html#tm.f.t_is_retr_async_reply),
but I'm not able to get it worked as expected:
 - t_is_retr_async_reply() function can be used only inside named
'onreply_route' (no default 'onreply_route' or standard 'reply_route')
 - drop() function, on the contrary, doesn't allow to drop 200OK
messages inside named 'onreply_route' (but only in default
'onreply_route' or standard 'reply_route').

Do you have any suggestion on how I can achieve my task?

Thank you very much for your support.
Marco

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