WorkPhone by IP Telecom 
WorkPhone allows you to make and receive calls over the internet using your IP Telecom hosted PBX account. Simply install the app on your desktop (Windows, MacOS and Linux), mobile (Android only) or access using a web browser (Chrome or Firefox).
Info
iOS versions coming soon.
Key Features
- Call transfer (attended and unattended)
- Call forwarding (if call forwarding is enabled in hosted PBX only)
- Call hold
- Call blocking
- Incoming/outgoing call notifications
- Multiple ongoing calls
- Call recording (if call recording is enabled in hosted PBX only)
- Call waiting
- Call ignore
- Call history
- Local contact list
- Click-to-dial
- Redial from history
- Dial from contacts
- Auto answer
- Call parking
- Move call to another device
- In-app call forwarding
- Audio conferencing
- Presence indicator on contacts
- Company directory
- Disable call waiting
- Favourite contacts list
- Bluetooth support
- Multi-line and labels for contacts
- Import contacts from .csv
- Audio alert on call centre queue
- Yealink headset WH6X, UH36 & 34 support for bluetooth and USB
- Missed call indicator
- Missed call tab
- Add to contact from call history
- MFA support from DUO
Technical
- Audio: G.711, G.722, Opus
- Hosted PBX login
- DUO multi-factor authentication support
- Automatic WorkPhone device creation
- Existing WorkPhone device takeover
- Local settings to match hosted PBX device
- Dark/grey/light theming
(automatically matches device theme)