I am trying to register to a SIP proxy that is behind NAT. When proxy modifies the contact header of the REGISTER message to
register the address of the NAT rather than the UA's private IP-address behind the NAT, the SIP stack ignores the returned 200 OK message and doesn't inform my application at all.
I tried the same thing with e.g. "SJPhone" and everything worked well...
So, my question is that is it possible to configure the SIP stack so that it accepts these responses which have contact-header modified, or is there any other solution to my problem?
Has anyone had similar problems?
Thanks in advance,