This section describes specific known limitations in the Cisco Headset 720 Series.

For information on known limitations to the Cisco Headset USB HD Adapter see Cisco Headset USB HD Adapter Release Notes.

Connection with iPhones over a USB-C to Lightning Cable Adapter

• There is no audio in the headset when it's connected to an iPhone via a USB to lightning cable adapter.

  Use Bluetooth to connect your Cisco Headset 720 Series to a mobile device. Cisco only claims support for the cables and accessories included with your headset.

Choppy Audio Over the USB-C Cable with the MacBook Air

• On a MacBook Air with macOS Mojave 10.14.5, music playback becomes choppy for a few seconds after a Cisco Headset 720 Series connects with the USB cable.

  To avoid this issue, pause any streaming music or audio before the headset connects with the USB cable.

Headset Can't Switch Sources from MacBook Laptop

• On the MacBook Pro with MacOS Mojave version 10.14.5, music playback can't switch the Cisco Headset 720 from the MacBook Pro to a different Bluetooth source.

  You can only change the Cisco Headset 720 Bluetooth source from a MacBook Pro running MacOS 10.14.5 in the following scenarios:

  • Make or answer a call on a different Bluetooth device.

  • The Cisco Headset 720 connects to your MacBook Pro via the USB cable.

  • The Cisco Headset 720 connects to your MacBook Pro via the USB Adapter.

The Cisco Headsets App Doesn't Cleanly Disconnect the Cisco Headset 720 from Windows 10

• When you use the Cisco Headsets app to disconnect your Cisco Headset 720 from Windows 10, the list of connected devices occasionally still lists your headset and attempts to reconnect. You can directly disconnect your headset through the Windows 10 device page.

Music Controls Get Lost on Amazon Music for Mac

• The Cisco Headset 720 can occasionally lose music playback control on Amazon Music for Windows 10 and Mac. This problem only occurs over a Bluetooth connection. The volume controls are unaffected by this limitation.

Music Controls Get Lost on Windows 10

• The Cisco Headset 720 occasionally loses music playback control on Windows 10 devices. This problem only occurs over a Bluetooth connection. The volume controls are unaffected by this limitation.

USB Adapter set up delay

• Turn off your Cisco Headset 720 Series before you plug in the USB Adapter.

  When you connect the USB Adapter in the middle of an active call, there is a 5 to 15 second delay while the headset speaker and microphone connect. This problem only appears when the 720 Series is already on when the USB Adapter plugs into a call device and pairs.

MacBook Air Uses Internal Speakers When USB Adapter Connects

• Intermittently, a MacBook Air running MacOS version 10.14.6 doesn't automatically switch the audio source when the USB Adapter connects. You can still manually select the USB Adapter through your system preferences.

  Select Apple menu > System Preferences > Sound > Output > Cisco HS USB Adapter.

Bluetooth Reconnection Issues on Android 10 Devices

• Your headset may have reconnection issues if you connect to Android 10 before you connect to the Cisco Headsets mobile app.

  If you use the Cisco Headsets app, pair your headset to the app before you pair your Android device.

Audio Delays When You Switch the Music Source from MacOS Devices

• Users may experience long audio delays (up to one minute) when they change the Bluetooth source from MacOS to a mobile device.

You can download new Cisco Headset 720 Series firmware in the following places:

Table 1. Cisco Headset 720 Series firmware availability

Source	About	Connection	More Information
Cisco Headsets mobile app	Cisco Headsets is a mobile app that lets you update, control, and customize your headset from any iPhone or Android mobile device.	Bluetooth	Download and Set Up the Cisco Headsets App
Cisco Accessory Hub	The Cisco Headsets web tool enables you to download the latest Cisco Headset 720 Series firmware through the USB cable. You can also upload older firmware versions to your headset from your desktop. You can find older headset firmware versions on the Cisco Software Download page.   Headset firmware zip files 3.0(0.1) and later include firmware for the Cisco Headset 720 Series and the USB Adapter. Review the zip file readme to see which headset models are included.	USB cable	Upgrade Your Headset with Cisco Accessory Hub
Cisco Webex	You can download the latest headset firmware through the USB cable. Webex desktop app prompts you to update your headset whenever there is a new firmware version available.	USB cable	Upgrade Your Cisco Headset to the Latest Release on Webex
Cisco IP Phone 8800 Series	You can download the latest headset firmware with the Cisco IP Phone 8800 Series through the USB cable. Your phone prompts you to upgrade whenever new firmware is available.   Your phone must have firmware release 14.1(1) or later and connect to Cisco Unified Communications Manager version 11.5(1)SU7 or later, or 12.5(1)SU1 or later.	USB cable

The Cisco Headset 720 Series is available for deployment in the countries and regions listed below.