Looking at the wireshark trace on V4 I see this,
10.180.235.240 10.180.235.241 TCP 49260 > sip-tls [RST, ACK] Seq=272 Ack=2311 Win=0 Len=0
Like the PBX is trying to use TLS on port 5061. My extension has a registration that looks like this, sip:+1717XXXXXXX@smed0100301.domain.lcl;transport=tcp
How can I force it to use 5060? The mediation server can't listen on 5061.