Hi Brett,
Could u please clarify the below question on how to respond when
NULL Connection IP is received in SDP c= line?
1 ) What must be done when NULL IPv6 address in received in SDP c=
line,
should it be used for putting a call on hold, should it be
ignored by sending
answer with sendrecv direction and valid connection IP or reject
with 488.
Thanks in advance.
Regards
Bindu
On Wed, 2011-02-02 at 05:43 -0800, Brett Tate wrote:
> The following draft updates RFC 3264.
>
> http://tools.ietf.org/html/draft-ietf-sipping-v6-transition-07
>
> The .invalid is used for ipv6. The working group didn't like 0.0.0.0 for
> ipv4; however it was basically grandfathered in for ipv4. The following link
> discusses some of this.
>
> http://www.ietf.org/mail-archive/web/mmusic/current/msg07007.html
>
>
> If people send :: (or the various equivalents) in ipv6, it is not considered
> to have special meaning (as far as I know) other than your device potentially
> not liking it.
>
>
> > -----Original Message-----
> > From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-
> > implementors-boun...@lists.cs.columbia.edu] On Behalf Of bindukumari.r
> > Sent: Wednesday, February 02, 2011 4:25 AM
> > To: sip-implementors@lists.cs.columbia.edu
> > Subject: [Sip-implementors] Query on Handling of null ipv6 address in
> > SDP c= line
> >
> > Hi All,
> > Please clarify how to handle NULL IPv6 address in SDP c= line.
> > According to the following snippet of RFC 3264
> > "RFC 2543 [10] specified that placing a user on hold was
> > accomplished
> > by setting the connection address to 0.0.0.0. Its usage for
> > putting
> > a call
> > on hold is no longer recommended, since it doesn't allow for RTCP
> > to
> > be
> > used with held streams, doesn't work with IPv6,and breaks with
> > connection oriented media."
> >
> > Please clarify the following -
> >
> > 1) What is the reason why NULL Connection IP "doesn't work with
> > IPv6"?
> >
> > a) What must be done when NULL IPv6 address in received in SDP
> > c= line,
> > should it be used for putting a call on hold, should it be
> > ignored by
> > sending answer with sendrecv direction and valid connection IP
> > or reject with 488.
> >
> > b) If it should be considered for putting a call on hold then
> > what is the IPv6
> > address that must be sent in the c= line, the expanded
> > (0:0:0:0:0:0:0:0)
> > or the compressed address (::), any preferences?
> >
> > 2) Parsing of the c= line - The NULL IPv6 address can be in any
> > format, for example
> > c=0:0:0:0:0:0:0:0 or c=:: , What are the other formats that
> > must
> > be considered
> > for the parsing of this address?
> >
> > Thanks in advance.
> >
> > Regards
> > Bindu
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