> Is the below value acceptable in the Alert-Info header value?
>
> $@#$%^&*()_+{}:"<>?

The following is the ABNF.  I'm not sure what Alert-Info header position
applies to your question.

Alert-Info   =  "Alert-Info" HCOLON alert-param *(COMMA alert-param)
alert-param  =  LAQUOT absoluteURI RAQUOT *( SEMI generic-param )
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