Hi,

Googling, seeing rfc 3261 seems i miss some  thing ....

How register method over TCP acts ?
Does register contact binding must hold reference to TCP connection what 
made register ?
If not then how then you never can connect LAN SIP device over TCP and 
UDP won't work too because phone haven't sent packet out.

If registration keeps connection and all request to that SIP device will 
be sent through that connection i get how that will work.
unknown UA 1 -> invite -> proxy, proxy will reuse registration TCP 
connection -> UA 2

Any comments very welcome.

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