Timer T398, in milliseconds, is the interval this port waits for a DROP PARTY ACKNOWLEDGE after sending a DROP PARTY message to remove one leg from a multipoint SVC. This governs how the switch handles a multiparty call where one participant is being disconnected but the far end is slow to confirm the removal, which matters because until the ack arrives (or T398 expires and forces the removal) that party's bandwidth reservation on the connection is still technically held. If a conferencing application on this switch regularly sees stuck party-drop operations, checking whether T398 is too short relative to the far end's processing time is a natural first step.