Hello. I am administering a Mitel 3300 ICP. It is connected to the PSTN using two PRI connections: one connects to service provider A's network which uses a landline number (inbound calls are received on this line) and the second one connects to service provider B's network which uses a mobile number (outbound calls are made on this line). Some users have been complaining about the phone call dropping in the middle of a call and the occurrence of one way audio. This happens at random times and is not easy to reproduce. I have checked the audit logs and maintenance logs in the Mitel 3300 web interface around the time that the call problem was reported, but have not found anything which could be the cause. Also, the Mitel 3300 ICP indicates that there are no alarms. Could this mean that the problem is not with the Mitel 3300 ICP? How could one troubleshoot these two problems to find out the cause?