Subject: Re: [MMUSIC] Blank IPv6 c lines

From: Paul Kyzivat <[email-masked]>
Date: Tue, 21 Jun 2005 13:16:15 -0400

The a= solution is preferred when possible. However there are cases when 
one party has no address to use. Some 3pcc scenarios fall into this, 
where a node that does switching but has no media capability must 
construct an offer.

	Paul

Louis Alexander wrote:
> Is this not an appropriate place to use a SDP attribute such as a=sendonly
> or a=inactive?
> 
> Louis
> 
> -----Original Message-----
> From: [email-masked] [mailto:[email-masked]] On Behalf Of
> Paul Kyzivat
> Sent: Tuesday, June 21, 2005 9:35 AM
> To: Gonzalo Camarillo
> Cc: mmusic
> Subject: Re: [MMUSIC] Blank IPv6 c lines
> 
> 
> 
> Gonzalo Camarillo wrote:
> 
>>Folks,
>>
>>when a SIP user agent cannot provide an IPv4 address for some reason 
>>(e.g., in third-party call control scenarios) it uses the following 'c' 
>>line:
>>
>>c=IN IP4 0.0.0.0
>>
>>Do we have an equivalent for IPv6 'c' lines? If not, we need to come up 
>>with something.
> 
> 
> AFAIK we don't have an equivalent.
> 
> But why would we need one? Does it really matter if the "null" address 
> is IPv4 or IPv6? Either way I am not going to be sending or receiving 
> with it.
> 
> 	Paul
> 
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