> Which RFC describes the URI username part options?
RFC 3261 sections 19.1 and 25.1 discuss the basic ABNF.
SIP-URI = "sip:" [ userinfo ] hostport
uri-parameters [ headers ]
SIPS-URI = "sips:" [ userinfo ] hostport
uri-parameters [ headers ]
userinfo = ( user / telephone-subscriber ) [ ":" password ] "@"
user = 1*( unreserved / escaped / user-unreserved )
user-unreserved = "&" / "=" / "+" / "$" / "," / ";" / "?" / "/"
The telephone-subscriber is defined within rfc2806, rfc3966, and rfc5341. The
following is the IANA link for registered tel-uri parameters.
http://www.iana.org/assignments/tel-uri-parameters/tel-uri-parameters.xml
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