> If INVITE request contains a SDP with protocol version
> as 1 shown below. Is that req is valid??
Yes; however version 1 has not yet been standardized.
> is threre any other version number that is used for
> SIP request other than zero("0")?
Not yet.
> and what does minor version number mean?
A fractional increment such as something like 0.1 and 0.2
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