#
U 77.239.230.202:5060 -> 81.9.100.13:5060
REGISTER sip:81.9.100.13 SIP/2.0.
Via: SIP/2.0/UDP 192
#
U 81.9.100.13:5060 -> 77.239.230.202:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 192.168.50.10;rport=5
#
U 77.239.230.202:5060 -> 81.9.100.13:5060
REGISTER sip:81.9.100.13 SIP/2.0.
Via: SIP/2.0/UDP 192
#
U 81.9.100.13:5060 -> 77.239.230.202:5060
SIP/2.0 401 Unauthorized.
Via: SIP/2.0/UDP 192.168.50.
#
U 77.239.230.202:5060 -> 81.9.100.13:5060
REGISTER sip:81.9.100.13 SIP/2.0.
Via: SIP/2.0/UDP 192
#
U 81.9.100.13:5060 -> 77.239.230.202:5060
SIP/2.0 200 OK.
Via: SIP/2.0/UDP 192.168.50.10;rport=5
exit