Think you can still do a threshold alert key on the 3300 but its for ACD paths.
Threshold Alerting
The threshold alert feature triggers an alert based on the longest call waiting queued to an ACD group. This feature alerts agents and supervisors that a predefined threshold has been exceeded.
Threshold alerting provides a visual indication of the longest call waiting in the queue of an ACD group. The LCD on ACD telephone sets flashes at a different rate when the threshold limit is exceeded. The audible sound, a "blip", can also be set to alert an agent when the threshold period is exceeded. There can be a delay of up to 15 seconds before the threshold alert feature triggers a visual or audible notification depending on the amount of call traffic (more traffic results in a longer delay)
The threshold times are based on group programming in the ACD Agent Skill Groups form. The first and second status threshold specifies the time for calls queued against the agent skill group.
I'd tell you a UDP joke but I'm afraid you won't get it. TCP jokes are the best because you always get them.