Changed From Tag in Spiral Request

Hi All,
	If a UA receives a request in a spiralled way then shouldn't the
From Tag and Call-ID same as the originated request?
	Should the UA accept the received request as spiral if call-ID is
same and From tag is different? Please let me know if there is any business
use case of such scenario if you have come across.
	Since the match algo is not well defined for spiral in RFC, we need
a reference.

Thanks,
Manju



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