Speakers on Cisco phones are not designed to work via USB nor Bluetooth. They are intended to work via "External PC" which means Line jack 3.5 mm. Check documentation below:   https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/9971_9951_8961/...

Hello Horacio, Does the issue happen with a different headset or using handset? Please provide console logs and CUCM traces of the issue. Best regards, Rafael Rada

Hi, Did you try also putting the firmware on the phone load name? Link: https://supportforums.cisco.com/document/9873946/upgrade-downgrade-firmware-specific-ip-phone I don't think pointing manually to the TFTP has something to do with this. I will...

Hi Horacio, I would like to get more details regarding the issue: - Is it happening with calls using headset, handset, speaker?. I ask because sometimes headsets can cause this behavior. - Is it ramdonly o it happens on every call after the same ti...