If you experience poor audio quality or audio drops during a call, this may be due to one of these reasons:

• Weak Wi-Fi signals: Check your Wi-Fi connection and signal strength. If your Wi-Fi signal is weak, move the call to your mobile network. While on a call, tap ... > Move to Mobile > OK > Answer.
• Mobile data network connectivity: If you're using Jabber on a mobile data network, your connectivity and call quality can vary. If you keep getting issues, disable mobile data network. In Cisco Jabber, tap Settings > Call > Audio and Video. Tap the Mobile Data Network switch to turn it off.
• Bluetooth and Wi-Fi interference: Even on a well-designed Wi-Fi networks, you can experience interference from other devices (like, Bluetooth headset), which can cause call drops or poor audio quality. Turn off the Bluetooth headset to see if that resolves the issue.
• Handoff between Wi-Fi access points: As you move around your workplace, your Wi-Fi connection may transfer between different Wi-Fi access points. If you are on a call during one of these transitions, you might hear a few seconds of garbled audio or silence. This problem resolves itself after the hand-off is completed.
• Lost connection to Phone Services: Common causes include network problems or servers that are down temporarily. Contact your system administrator if this issue persists.
• Low-bandwidth networks: If you call over a low-bandwidth wireless network, optimize your connection for low-bandwidth networks and try again. In Cisco Jabber, tap Settings > Call > Audio and Video. Tap the Low Bandwidth Mode switch to turn it on.