Although nat=yes/qualify=yes can handle some NAT routers, it does not handle all situation in both directions. Our experience suggests that nothing short of a full SIP Outbound Proxy is going to handle things properly. We have tried out ABP International's NATpass and SNOM's NATfilter, both with results that were underwhelming. Has anyone out there tried out a software SIP Outbound Proxy that works? George Pajari netVOICE communications
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