Simultaneous Mode Devices

Last Updated : Apr 27, 2026 |

An IP Office user can be logged in simultaneously on one of each of the following types of telephone devices:

Telephony Client

Notes

A physical desk phone

A physical phone, including a SIP, H.323 or DECT extension. This also includes clients running on a Vantage phone.

A desktop (PC) VoIP client:

  • Avaya Workplace Client for Windows

  • Avaya Workplace Client for macOS

A mobile VoIP client:

  • Avaya Workplace Client for Android

  • Avaya Workplace Client for iOS

A WebRTC client:

  • Avaya Calling using the Chrome extension.

  • IP Office User Portal.

Note:

You can use both IP Office User Portal and Avaya Calling using the Chrome extension at the same time. However, if both are in the softphone mode, both applications try to use your computer's microphone and speakers at once. This conflict can cause your calls to fail.

To make sure your calls work correctly, you can do the following:
  • Use only one application to answer or make calls.

  • If you must have both applications open, set the IP Office User Portal to Call Control mode.

This keeps the functionality stable and ensures your audio works every time.