Subject: [SIP] doubt in HOLD & HOLD retrieve

From: "kumar s" <[email-masked]>
Date: 4 Jun 2001 10:48:27 -0000

Hello all,

A and B are already have established a call. now A wants to put B on hold. That is

    INVITE B (with c=0.0.0.0 in SDP)
A  --------------------------------------->      B

   200 OK
  <-------------------------------------------    
	
   ACK
  ------------------------------------------->

i want to know, 

What A has to do if B replies with 4xx response. 
Can A give CANCEL after giving INVITE and before A's response, if A could, how B will treat this.
If A gives BYE  before retrieving B from hold, will this terminates the entire session between A and B.

Please could anyone explain me.

Thanks
S.Kumar

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