how to find unreplied connections?

Hello, everybody!

Please tell me how the script can remove a unreplied connections in /ip firewall connection … ?
All brains already broke, I can’t find connections by seen reply=no

wbr,
ijk2

in /ip firewall connection tracking print look for

tcp-syn-sent-timeout value, that is timeout for tcp connection, you send syn, and after what time connection will be removed from tracking table as timed out.

http://wiki.mikrotik.com/wiki/Manual:IP/Firewall/Connection_tracking

In /ip firewall connection tracking print all parameters are set to default.

More specifically, I have a problem with hanging SIP UDP-connections.
They become unreplied, ticking from 60 minutes to zero, then again from 60 minutes to zero, and so indefinitely.
As a result, the new sip-connections between the same ip-addresses (sip-server and sip-phone) can not be established.