MMS-Ind: Ports and expiry date

Hi list, 

could somebody tell me more about the ports section in the mms 
notification? Why is there a source and destination port? I thought
that only a destination port is necessary. (Nokia has different ports
for different applications). 

How can the relative expiry date be calculated and how do i have
to sepcify the absolute expiry date?

Thanks in advance, 
			 Jason Brian
-- 
. / j a s o n      

Jason-Brian Friedrich                        [email protected]
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