Participants are dropped from the audio conference after 3-5 minutes when using a Snom phone.
Audio conference is disconnected after 3-5 minutes when a Snom phone user is on mute.
RTP packets are not sent when Snom phone users are on mute, therefore, Webex disconnects the participants from the audio conference.
To resolve this issue, enable the setting Send silent RTP packets while on mute in the Snom WebUI. Once this setting is activated, the user will continue to be in the Webex audio conference even when muted.