> 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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