the explanation on maximum recording length is to define the length for undentified callers when they leave messages. I tested in two scenarios below, it all applies.(caller hear you've reached the max recording length etc). this doesn't look right to me,
A subscriber leave message to another subscriber(this one has 1 second max recording setting)
A non-subscriber( a CCM phone) leave message to a subscriber(this one has 1 second max recording setting).
I thought at least it should allow the subscriber caller to leave message.