[SR-Users] Drop 200OK re-transmissions of suspended transaction

[Marco Capetta]

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