[SIPForum-discussion] PRACK doubt...

[Nithyakumar.R]

Hi ,

 

I have doubt in PRACK message..

 

i)  Proxy  MUST NOT attempt to sent reliable provisional responses.for any
request that contains tag in the To field. That is, a proxy cannot generate
reliable provisional responses to requests sent within the context of a
dialog. 

 As per RFC 3262.. (section 3 .. UAS Behavior)

 

 

ii) A UAS MUST NOT attempt to send a 100 (Trying) response reliably.

 

Can Anyone help me to understand these statement...

 

i)             why a proxy cannot generate reliable provisional responses to
requests sent within the context of a dialog. ...and

ii)             why UAS MUST NOT attempt to send a 100 (Trying) response
reliably ..

 

 

 

Thanks in advance..

 



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