Aastra 6757i CT User Manual page 255

2. The "Call Hold Reminder During Active Calls" field is disabled by default. To enabled
this field, check the box.
When this feature is enabled, a reminder tone is heard on the active call when another call is
on hold. When disabled, a ring splash is heard when the active call hangs up and there is still
a call on hold.
3. Click Save Settings.
248 Model 6757i CT IP Phone User Guide