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ABNF for SIP:  Uniform Resource Identifiers

SIP-URI   userinfo   hostport   uri‑parameters   headers   absoluteURI   tel‑URI

SIP-URI   =
"sip:"     [ userinfo ]    hostport    uri‑parameters    [ headers ]
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SIPS-URI   =
"sips:"    [ userinfo ]    hostport    uri‑parameters    [ headers ]
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