################################################################################
    Descubrimento na rede
################################################################################
OPTIONS sip:100@127.0.0.1 SIP/2.0
Via: SIP/2.0/UDP 127.0.1.1:5061;branch=z9hG4bK-487618168;rport
Max-Forwards: 70
To: "sipvicious"<sip:100@1.1.1.1>
From: "sipvicious"<sip:100@1.1.1.1>;tag=37663030303030313133633401393537303038303638
User-Agent: friendly-scanner
Call-ID: 447615548427934163033914
Contact: sip:100@127.0.1.1:5061
CSeq: 1 OPTIONS
Accept: application/sdp
Content-Length: 0


SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 127.0.1.1:5060;rport=65476;received=185.179.142.180;branch=z9hG4bK-3692480612
Call-ID: 953932568039675157936807
From: "sipvicious" <sip:100@1.1.1.1>;tag=6239623338663563313363370134323538333932373936
To: "sipvicious" <sip:100@1.1.1.1>;tag=z9hG4bK-3692480612
CSeq: 1 OPTIONS
Accept: application/xpidf+xml, application/cpim-pidf+xml, application/dialog-info+xml, application/simple-message-summary, application/pidf+xml, application/pidf+xml, application/dialog-info+xml, application/s
ple-message-summary, application/sdp, message/sipfrag;version=2.0
Allow: OPTIONS, REGISTER, SUBSCRIBE, NOTIFY, PUBLISH, INVITE, ACK, BYE, CANCEL, UPDATE, PRACK, MESSAGE, REFER
Supported: 100rel, timer, replaces, norefersub
Accept-Encoding: identity
Accept-Language: en
Server: Asterisk PBX 18.9.0
Content-Length:  0


################################################################################
    Descubrimento extensiós
    - manta register
    - si devolve "unauthorized" é que existe
    - si devolve "forbiden" é que non existe
################################################################################
REGISTER sip:xinu.me SIP/2.0
Via: SIP/2.0/UDP 127.0.1.1:5060;branch=z9hG4bK-569407384;rport
Max-Forwards: 70
To: "6666666666"<sip:6666666666@xinu.me>
From: "6666666666"<sip:6666666666@xinu.me>;tag=36363636363636363636013930343637323738
User-Agent: friendly-scanner
Call-ID: 1283048503
Contact: sip:6666666666@xinu.me
CSeq: 1 REGISTER
Accept: application/sdp
Content-Length: 0


SIP/2.0 401 Unauthorized
Via: SIP/2.0/UDP 127.0.1.1:5060;rport=65476;received=185.179.142.180;branch=z9hG4bK-569407384
Call-ID: 1283048503
From: "6666666666" <sip:6666666666@xinu.me>;tag=36363636363636363636013930343637323738
To: "6666666666" <sip:6666666666@xinu.me>;tag=z9hG4bK-569407384
CSeq: 1 REGISTER
WWW-Authenticate: Digest realm="asterisk",nonce="1670408728/f2288b61ff3e1c5a8fbad2282734a53b",opaque="37899594559ff83d",algorithm=md5,qop="auth"
Server: Asterisk PBX 18.9.0
Content-Length:  0


###

2022/12/07 11:25:28.115453 185.179.142.180:65476 -> 185.179.143.92:5063
REGISTER sip:xinu.me SIP/2.0
Via: SIP/2.0/UDP 127.0.1.1:5060;branch=z9hG4bK-457882779;rport
Max-Forwards: 70
To: "6666666667"<sip:6666666667@xinu.me>
From: "6666666667"<sip:6666666667@xinu.me>;tag=363636363636363636370133303731363137323935
User-Agent: friendly-scanner
Call-ID: 2112593047
Contact: sip:6666666667@xinu.me
CSeq: 1 REGISTER
Accept: application/sdp
Content-Length: 0


2022/12/07 11:25:28.116036 185.179.143.92:5063 -> 185.179.142.180:65476
SIP/2.0 403 Forbidden
Via: SIP/2.0/UDP 127.0.1.1:5060;rport=65476;received=185.179.142.180;branch=z9hG4bK-457882779
Call-ID: 2112593047
From: "6666666667" <sip:6666666667@xinu.me>;tag=363636363636363636370133303731363137323935
To: "6666666667" <sip:6666666667@xinu.me>;tag=z9hG4bK-457882779
CSeq: 1 REGISTER
Server: Asterisk PBX 18.9.0
Content-Length:  0