[Serusers] RTPproxy how to

[crazy]

hi all 
       i donot know howto set the port of RTPproxy, my server public ip such 
as 202.97.123.123, i want to set RTPproxy use the 5080-5082 ports,what can i 
do for it. client can use 202.97.123.123:5080-5082 as a outbound proxy!