[Sip] Issue with the Timestamp grammar in RFC-3261

Hi,
	I feel the grammar of the Timestamp header is buggy.
The grammar being
Timestamp  =  "Timestamp" HCOLON 1*(DIGIT)
               [ "." *(DIGIT) ] [ LWS delay ]
delay      =  *(DIGIT) [ "." *(DIGIT) ]

Can allow the following two cases which makes no sense

Timestamp : 1.
Timestamp : 1.0 .

Should'nt a bug be raised against this to update the grammar to

Timestamp  =  "Timestamp" HCOLON 1*(DIGIT)
               [ "." 1*(DIGIT) ] [ LWS delay ]
delay      =  1*(DIGIT) [ "." 1*(DIGIT) ]

Thanks for the patient reading.

Cheers,
Prasanna

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