We are using a 3925 router - c3900-universalk9-mz.SPA.150-1.M4.bin - as an H323 gateway with 2 PRI's. We have a PUB and a SUB running - System version: 8.5.1.11900-21 When we place people on hold we get MOH very intermittently. Out of 10 calls 8 migh...