We have a fairly complex amalgamation of systems here. A Nortel connected to an 8710 which are both connected to an 8730. When one calls from the 8710 to the 8730 it goes through fine sometimes and other times gets a wave-off. I did a list trace on a station and when it fails I get a "denial event 1192." The trunk group on the 8710 looks good and the members sometime work and others don't. My assumption is that it has to do with the connection between the 8730 and the Nortel (from the 8710 it goes first to the Nortel then to the 8730). I am looking for direction.