AASTRA 6700i series, 9143, 9480i, 9480i CT SIP Administrator Guide EN - Manual (Page 362)

41-001343-01 Rev 03, Release 3.2.2 5-85
Aastra Web UI
1 Click on Basic Settings->Preferences->General.
.
2 In the "Call Hold Reminder During Active Calls" field, enable this feature by placing a check mark
in 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 to save your changes.