[SIPForum-discussion] Possible responses to 180 Ringing Messages

[Abhishek Jain]

Hi Albert,

The third message is INVITE. Please refer to section #6.1 and #6.2 in
draft-ietf-sip-183-00.txt<http://tools.ietf.org/html/draft-ietf-sip-183-00.txt>
.

Regards
Abhishek

On Fri, Dec 9, 2011 at 5:23 PM, Albert Etsebeth <umbrualbert at gmail.com>wrote:

> 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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