SIP is unsuited for any environment. It is a disgrace of a protocol and a hot mess at that. At it's foundation it was designed to be 100% NAT incompatible and since it's inception bandage has been added to address this and it's other shortcomings. Faster we replace it with some/any alternative the better. From protocol design standpoint, SIP is so bad that it makes H.323 feel like a sane VoIP protocol (which it isn't). </rant>