1. Burstable Enterprise Shared Trunks (BEST) An Overview

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7. Basic IP Trunking How it Works Concurrent Call Ports represent simultaneous inbound and outbound local and LD calls, or ‘SIP paths’ Public Switched Telephone Network PSTN Gateway Concurrent Call Ports 10 Total Ports 5 Used 5 Available Concurrent Call Ports 10 Total Ports 5 Used 5 Available Verizon VoIP Network Location A Location B Location C Concurrent Call Ports 10 Total Ports 10 Used 0 Available No additional calls can be connected X

8. Adding BEST Enterprise-level Concurrent Call Ports (Enterprise CC Ports) Public Switched Telephone Network PSTN Gateway Concurrent Call Ports 10 Total Ports 5 Used Concurrent Call Ports 10 Total Ports 5 Used Concurrent Call Ports 10 Total Ports 10 Used Verizon VoIP Network BEST Tracker Location A Location B Location C Concurrent Call Ports 10 Location A 10 Location B 10 Location C 30 Enterprise CC Ports Enterprise CC Ports 30 Enterprise Ports 20 Used 10 Available Enterprise CC Ports

9. BEST How Burst Works Public Switched Telephone Network PSTN Gateway Concurrent Call Ports 10 Total Ports 5 Used Concurrent Call Ports 10 Total Ports 5 Used Concurrent Call Ports 10 Total Ports 10 Used 5 Burst Allowed Verizon VoIP Network BEST Tracker 5 additional incoming calls 5 additional concurrent calls allowed to burst for Location C Location A Location B Location C Enterprise CC Ports 30 Enterprise Ports 20 Used 10 Available Enterprise CC Ports

10. BEST Important Traffic Management Considerations Public Switched Telephone Network PSTN Gateway Concurrent Call Ports 10 Total Ports 10 Used 5 Burst Allowed Concurrent Call Ports 10 Total Ports 10 Used 5 Burst Allowed Concurrent Call Ports 10 Total Ports 0 Used 0 Calls Allowed Verizon VoIP Network BEST Tracker All Enterprise Ports are Being Used No Additional Calls are Allowed Location A Location B Location C Enterprise CC Ports 30 Enterprise Ports 30 Used 0 Available Enterprise CC Ports No calls can be connected X