| ONCALL functions | | | | | | |
| Simultaneous calls | Unlimited | Unlimited | Unlimited | Unlimited | Unlimited | Unlimited |
| Call recording memory | 30 days | 30 days | 30 days | 30 days | 30 days | 30 days |
| Extensions | | | | | | |
| Conference calls | | | | | | |
| Connect and call between internal branches | Free | Free | Free | Free | Free | Free |
| Receive voicemail via email | | | | | | |
| Lời Chào Tự Động Nhiều Lớp (IVR) | | | | | | |
| Time of Day Routing | | | | | | |
| Day of Year Routing | | | | | | |
| Follow-me Call Routing | | | | | | |
| Automatic Call Distribution (ACD) | | | | | | |
| Call Forwarding, Call Waiting, Call Pickup, Call Park etc… | | | | | | |
| Call Forking | | | | | | |
| Integration with MS Teams (OnCallCX Applet) | | | | | | |
| Blacklist (Add the phone number to the inbound call blacklist) | | | | | | |
| Network Class of Services | | | | | | |
| Auto-Provisioning | | | | | | |
| Topstop | | | | | | |
| Click to call (Integrate a VoIP calling feature into the corporate Web) | | | | | | |
| Video call (Enable Video call reception on the Desktop App) | | | | | | |
| WebRTC (Voice/Video call initiation feature via Web/Desktop App) | | | | | | |
| Mobile App (Enable voice call functionality on the Mobile App) | | | | | | |
| Audio Conferencing | | | | | | |
| Connect the hotline numbers 1900, 1800 and fixed numbers | | | | | | |
| Advanced functions | Contact us |
| Store incoming / outgoing call recording |
| Accounting management, user charges |
| Integrated API for extended customer management applications |