From: "Jackson, James" <[EMAIL PROTECTED]>
When a SIP header provides explicit values but also has the option to
support other values using a quoted-string, is it valid syntax for the
explicit values to be enclosed in double-quotes ?
Well, yes. If a series of letters isn't enclosed in double-quotes,
it's a use of a BNF variable, not an explicit value.
For example, Diversion header reason syntax is:
diversion-reason = "reason" "="
( "unknown" | "user-busy" | "no-answer" |
"unavailable" | "unconditional" |
"time-of-day" | "do-not-disturb" |
"deflection" | "follow-me" |
"out-of-service" | "away" |
token | quoted-string )
Is it valid for an explicit value like "unconditional" to be in double
quotes ?
If it wasn't in quotes, there would have to be a rule like:
unconditional = "unconditional"
for it to mean anything.
Dale
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