Symptom:
The user is not getting any warning prompt like beep sound when it reaches the value Recording Termination Warning Time ( parameter value set as 15000 msecs or some n values )

Conditions:
-> userA and userB has mailbox in Unity connection server and associated Unified IP Phone.(99xx).
-> userB set call forward all to voicemail.
-> userB set maximum message length as 60 seconds.
-> Set Maximum Message length = 60 seconds by going through Unity connection Admin->Users->Select Users(userB) -> Edit Message Settings 
-> userA dialing DN of userB .(say 3110)
-> userA hears Unity Connection prompts since userB forwarded call to voicemail.
-> userA records the voicemail (Note : userA wants to record the voicemail up to allowed maximum time i.e. 60 seconds here) 
-> userA press # to send voicemail.(Note: when connection prompts to send)
-> userB checks the voicemail by login into voicemail service.
-> When userB checks the voicemail duration ,it has only 45 seconds. (Note: maximum message length for the user is configured as 60 seconds)