[Serusers] NAT travesal: force_rport() what does it do?

[Yi Zheng]

Hi,
   
  I am reading to understand the different solutions for NAT travesal. For nathelper+RTP proxy solution, what does the force_rport() function do? Is it rfc3581 compliant? Does it mean that the client needs to understand "received" and "rport" in the Via header? Thanks,
   
  - ming
   
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