[Sip] understanding problem

["Gemini6" <Gemini6@sohu.com>]

hi all
	in rfc2543 page 103
	A proxy server forwards any response for Call-IDs for which it does
not have a pending transaction according to the response's Via
header.
	
    what's the meaning of Call-IDs here?
	Do the response's Via header been used to determine a transaction is 
pending or not?  It seems not (from the others parts of this rfc).

　　　　　　　　Gemini6
　　　　　　　　Gemini6@sohu.com
　　　　　　　　　　2003-02-28


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