# unknown schemeszer:alice@example.orgmailto:jj@gnu.orghttp://www.example.org/file.htmlftp://www.example.org/index.htmlau://au.provider.org:6878/## contact with tags and url without brackets#sip:j.doe@big.com;tag=34ytr34.2sip:+1-212-555-1212:1234@gateway.com;tag=34ytr34.2sip:1212@gateway.com;tag=34ytr34.2sip:alice@10.1.2.3;tag=34ytr34.2sip:alice@example.com;tag=34ytr34.2sip:alice%40example.com@gateway.com;tag=34ytr34.2## url without url-parameter (contact parameter can be present)#sip:j.doe@big.comsip:j.doe@big.comsip:j.doe:secret@big.comsip:j.doe@big.comsip:+1-212-555-1212:1234@gateway.comsip:1212@gateway.comsip:alice@10.1.2.3sip:alice@example.comsip:alice%40example.com@gateway.comsip:alice@registrar.comsip:alice@registrar.com:5080sip:+1234@po4x80.comsip:+1254353534@0.tn_2.ebn_8.suisacro.frsip:MDU@1.kn_5.tn_1.suisacro.fr## Valid contact fields without display names and brackets#<sip:j.doe@big.com><sip:j.doe@big.com;maddr=239.255.255.1;ttl=15><sip:j.doe:secret@big.com;transport=tcp><sip:j.doe@big.com?subject=project><sip:+1-212-555-1212:1234@gateway.com;user=phone><sip:1212@gateway.com><sip:alice@10.1.2.3><sip:alice@example.com><sip:alice%40example.com@gateway.com><sip:alice@registrar.com;method=REGISTER><sip:alice@registrar.com:5080;method=REGISTER?subject=project&retry-after=3600><sip:+1234@po4x80.com;user=phone><sip:+1234@po4x80.com;user=phone?require=com.po4x80.call-bonheur&Proxy-Require=com.po4x80.call-malheur><sip:+1254353534@0.dsqn_2.aded.suisacro.fr;user=phone?Require=com.po4x80.y-rgbell.po4x80.artolatic-haka-off><sip:MDU@1.kn_5.tn_1.suisacro.fr;user=ip>## Valid contact fields without display names as token (not quoted strings)#alice<sip:alice@10.1.2.3>jack<sip:1212@gateway.com>j.doe <sip:j.doe@big.com;maddr=239.255.255.1;ttl=15>user<sip:+1-212-555-1212:1234@gateway.com;user=phone>;tag=54Alice <sip:alice@example.com>;tag=34ez2Alice<sip:alice%40example.com@gateway.com>;tag=345erye66A<sip:alice@registrar.com;method=REGISTER>a <sip:alice@registrar.com:5080;method=REGISTER?subject=project&retry-after=3600>## Valid contact fields with display names as quoted strings#"j.doe" <sip:j.doe@big.com>"+1234"<sip:+1234@ipworld3700.com;user=phone>"user"<sip:+1-212-555-1212:1234@gateway.com;user=phone>;tag=54"Alice" <sip:alice@example.com>;tag=34ez2"Alice"<sip:alice%40example.com@gateway.com>;tag=345erye66"A"<sip:alice@registrar.com;method=REGISTER>"a" <sip:alice@registrar.com:5080;method=REGISTER?subject=project&retry-after=3600>## valid cases with escaped characters#"j.doe\\\\" <sip:j.doe:secret@big.com;transport=tcp>"j.doe\\\"" <sip:j.doe:secret@big.com;transport=tcp>"j.doe\\\" <sip:j.doe:secret@big.com;transport=tcp>"j.doe\\"<sip:j.doe@big.com?subject=project>"j.doe\""<sip:j.doe@big.com?subject=project>"+1\"234"<sip:+1234@ipworld3700.com;user=phone>## valid cases with utf8#"礽查鵡r@ц￥" <sip:j.doe:secret@big.com;transport=tcp>"纊