Hopefully someone can help me. I have 3CX v10 (3CXPSSB) - 8 Simultaneous Calls On the outgoing rules: Route 1: Grandstream 4104 with 2 PSTN lines Route 2: VoIP Provider (VoIP Unlimited) All incoming calls come through VoIP Unlimited. I have setup an outbound rule with a prefix to test outgoing through VoIP Unlimited, all working correctly. My problem is if more than 2 people make outgoing calls and both PSTN lines are in use I get: 1. Event ID 12289 No available outgoing trunks in the event log 2. "Rejected! Line is 'busy' because number of simultaneous calls per line is limited by Administrator" in the Activity log The backup route 2 through the VoIP provider is never used.