Has any one experienced issues with inbound calls from Cellular networks to an 3300Mxe MCD 8.1 Controller with PRI? Users have reported Intermittent no audio on inbound calls from people on cell phones. An inbound call is made to a DID on the system, the Mitel user answers the call but no audio both ways. The outside caller does not even hear ringing when placing the call. Both parties assume no one is there and they hangup. Outside caller calls back in and gets connected normally. We had assumed it was a particular trunk but causing the issue but found that it happened on multiple trunks. Also found that issue could be duplicated by calling in with certain Cellular carriers. Could not duplicate issue when calling in with a Landline. Reported issue to telco and they said it was the PBX. Reported issue to Mitel Support and they said could be internal IP network related.