For reference, from sip grammar (rfc3261, section25):
```
uri-parameters = *( ";" uri-parameter)
uri-parameter = transport-param / user-param / method-param
/ ttl-param / maddr-param / lr-param / other-param
other-param = pname [ "=" pvalue ]
pname = 1*paramchar
pvalue = 1*paramchar
paramchar = param-unreserved / unreserved / escaped
param-unreserved = "[" / "]" / "/" / ":" /
"&" / "+" / "$"
```
Therefore '[' and ']' are allowed in uri parameter, being part of
'param-unreserved' group of chars.
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