[Serusers] Nathelper need Cisco's Sip router,,,?

[jimmy huang]

Hi

I have build a sip environment 
one pc A(red hat 9) as gateway , only enable NAT , and install ser with nathelper
notebook B get ip from pc A , register to PC A's public IP
notebook C is public and register SIP to pc A's public IP




                                +-------------------+
                                |   PC C (Msn)     |
                                +-------------------+
                                             |           
                                             |   Internet
                                             |
                     +----------------------------------------+
                     |   Gateway     / NAT                       |  
                     |   Ser with Nathelper                       |
                     |    PC A                                          |
                     +----------------------------------------+
                                             |
                                             |   Intranet
                                             |
                       +-------------------------------------+
                       |   PC B     (Kphone 3.14)            |
                       +-------------------------------------+

B call C , then C pick up the call , but voice from B to C can work , C's voice can't make it
My question is Nathelper this module is now only for Cisco is Sip ... ? and is this module need
STUN server ?

Now , for ser  , how to solve NAT/Firewall 's problem ? or it's service provider's issue ?
Thanks
Jimmy
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