how monitoring/trace signalling @ MGW Nokia

[alitomtom]

Dear expert

yesterday in order integrating voice trunks with other operators. Where direct signaling link used via MGW (usually quasi via STP).currently done test fitting call a problem. In fact parameter2 in use already feels right and trunknya was already UP.
Meditation of ISUP messages which would be observed through these direct links.
The question is how does the way the monitoring / tracing mesage distinguished by signaling in MGW NOKIA?

thanks