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In Sametime 12 HF1, for kubernetes, there is a setting in the values.yaml to disable this feature. Simply change the setting:
guestsCanFetchAvatars: true
To:
guestsCanFetchAvatars: false
Then save/close the values.yaml and run a helm upgrade. I am not sure off-hand what the setting is for Docker, open a case with Technical Support or perhaps you can post the question in the Sametime community forum.