The advantages are documented in RFC 3264. They are:

1.  c=0.0.0.0 notion does not support IPv6
2.  c=0.0.0.0 kills RTCP in addition to RTP
3.  c=0.0.0.0 does not allow uni-directional pausing of media streams


On 4/27/07, varun <[EMAIL PROTECTED]> wrote:
>
> Hi,
> I think there are two ways to put a call on hold in
> SIP.
>
> 1> call from user A ->user B.
> User B can send an INVITE with c = 0.0.0.0.
>
> 2> User B can send Sdp with a = sendonly.User A
> responds with a = recv only.
>
> What is the advantage of the second mechanism over the
> first one.
>
>
> Appreciate your help on this ASAP.
>
> Thanks
> varun
>
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