[SIPForum-discussion] Possible responses to 180 Ringing Messages

[Albert Etsebeth]

Hi All

I got this question in a exam, and its been driving me mad.

Question:"what are valid responses to 180 ringing" (Choose 3)

Options:PRACK / ACK / BYE /CANCEL /INVITE

In my opinion there is only 2, PRACK and CANCEL

Thanks

umbru
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