Proton-103	Proton-205
1 Trunk x 3 Extensions 3-Party Conference Boss-Secretary Distinctive Ringing Memory Dialing Quick Dial Simultaneous Ring	2 Trunks x 5 Extensions 3-Party Conference Auto Day-Night Mode Boss-Secretary Distinctive Ringing Internet Ready Simultaneous and Round-Robin Rings
Proton-206	Proton-308
2 Trunks x 6 Extensions Allowed and Denied Lists Auto Redial Call Duration Control Class of Service Direct Inward Dialing (DID) Remote Programming	3 Trunks x 8 Extensions Allowed and Denied Lists Auto Redial Call Duration Control Class of Service Direct Inward Dialing (DID) Remote Programming
Vision - 206S	Vision - 207P
2 Trunks x 6 Extensions Abbreviated Dialing Auto Redial for Multiple Numbers Battery Charger CLI (DTMF) CLI Based Routing Internet Ready Port Least Cost Routing Live Call Supervision	2 Trunks x 7 Extensions Auto Attendant (Voice Prompts) CLI (DTMF) Computer Connectivity External Music Port Inbound Call Analysis Internet Ready Port Least Cost Routing Public Address System Port SMDR with Reports
Vision - 308S	Vision - 309P
3 Trunks x 8 Extensions Abbreviated Dialing Auto Redial for Multiple Numbers Battery Charger CLI (DTMF) CLI Based Routing Internet Ready Port Least Cost Routing Live Call Supervision	3 Trunks x 9 Extensions Auto Attendant (Voice Prompts) CLI (DTMF) Computer Connectivity External Music Port Inbound Call Analysis Internet Ready Port Least Cost Routing Public Address System Port SMDR with Reports
Vision - 206P - Ultra	Vision - 308P - Ultra
2 Trunks x 6 Extensions Auto Attendant (Voice Prompts) Calling Name Display CLIP (DTMF, FSK) Dial by Name Door-Phone Port External Music and PAS Ports Inbound Call Analysis Internet Ready Port Least Cost Routing Remote Status Display Unit Security Dialer SMDR with Reports Windows Programming Tool	3 Trunks x 8 Extensions Auto Attendant (Voice Prompts) Calling Name Display CLIP (DTMF, FSK) Dial by Name Door-Phone Port External Music Port and PAS Ports Inbound Call Analysis Internet Ready Port Least Cost Routing Remote Status Display Unit Security Dialer SMDR with Reports Windows Programming Tool
Vision - 412P - Ultra	Vision - 616P - Ultra
4 Trunks x 12 Extensions Auto Attendant (Voice Prompts) Calling Name Display CLIP (DTMF, FSK) Dial by Name Door-Phone Port External Music and PAS Ports Inbound Call Analysis Internet Ready Port Least Cost Routing Remote Status Display Unit Security Dialer SMDR with Reports Windows Programming Tool Security Dialer	6 Trunks x 16 Extensions Auto Attendant (Voice Prompts) Calling Name Display CLIP (DTMF, FSK) Dial by Name Door-Phone Port External Music and PAS Ports Inbound Call Analysis Internet Ready Port Least Cost Routing Remote Status Display Unit Security Dialer SMDR with Reports Windows Programming Tool Security Dialer