I am using Kamailio versions 5.5.7 and 5.8.0  as a stateful proxy (with tm module) and I want to have metrics for all
the SIP messages received and sent. I am using the statistics module for counting messages.
I have in configuration file the following routes to capture events and count them: onsend_route, onreply_route and event ( corex:reply-out, tn:local_response, sl:local-response, tm:local-request, sl:filtered-ack and network:msg)
I have found the following problems that I need some hints how to solve them:

1) When a response is received to a request, I can count the response received in the reply_route
but I don't find a way that works to count the reply being forwarded to the other side. onsend_route works fine
for requests being forwarded. Is there any event_route or any trick that can be used to count the reply being
forwarded similar to the onsend_route for requests?

2) When Kamailio receives a CANCEL it generates and sends automatically the 200 OK for the CANCEL
and a 487 for the INVITE which started that dialog which is being cancelled, but I don't find a way that works to count those two responses Kamailio generates.

3) After having cancelled a dialog on one direction due to receipt of a CANCEL, kamailio generates local requests on the other direction,
 a CANCEL and an ACK also when it receives a 487 for the INVITE being cancelled.
I don't find the way to count those.  onsend_route does not work for locally generated CANCEL and ACK requests and the event_route[tm:local-request] only works for
requests created outside of the tm module but not those created by the tm module itself (the CANCEL
and the ACKs) since the tm module is not using its own function t_uac_prepare to create those requests
(that function is the one that calls the event_route).  Is there any statistic generated by the tm
module or elsewhere or any other trick so I can count those requests?

4) When Kamailio generates retransmissions how can I count those? onsend_route, onreply_route and event ( corex:reply-out, tn:local_response, sl:local-response) doesn't work for retransmissions. Are there statistics generated somewhere in the tm module for retransmissions? Is there any other way to count those.



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