> If the B2BUA is supporting both IPV4 or IPV6 address, > which IP does the B2BUA place, its IPV4 or IPV6 address?
It can populate whatever address it wants within the Via (although you might care more when populating Contact/Record-Route or Via's maddr). The Via's received parameter will be added if needed. However from an interoperability perspective, you might want to only include an IPv6 address when using IPv6 or know that the next hop supports it. The following may be of interest: RFC 6157, RFC 5118, and draft-ietf-sipcore-dns-dual-stack. _______________________________________________ Sip-implementors mailing list Sip-implementors@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
