Hi, I register a X-Lite (TCP client) and a Twinkle (UDP client) behind NAT. I dissable STUN, ICE, keepalive, "discover external address", etc... in both.
They send a REGISTER to my OpenSer with public IP so I enable OPTIONS pinging ifor both (I confirm that "location" table has the same cflags for the you entries and so, all is correct.
But I just see a periodical SIP OPTIONS by UDP for Twinkle. Are they exist in case of TCP?