See the following draft: 
http://tools.ietf.org/html/draft-ietf-sipping-v6-transition-07 


> -----Original Message-----
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On 
> Behalf Of Szilagyi, Mike
> Sent: Tuesday, September 23, 2008 3:41 PM
> To: Sip-implementors@lists.cs.columbia.edu
> Subject: [Sip-implementors] Proper signaling of IPV4 / IPV6 in SDP?
> 
> What is the proper way to signal RTP support for both 
> IPV6/IPV4 in the SDP?
> 
> Should there be a single m=line with two c=lines:
> 
>       m=audio 25000 RTP/AVP 0
>       c=IN IP6 2001:DB8::1
>       c=IN IP4 192.0.2.1
> 
> or two m=lines with two 2 c=lines:
> 
> 
>       m=audio 25000 RTP/AVP 0
> 
>       c=IN IP6 2001:DB8::1
> 
>       m=audio 25000 RTP/AVP 0
> 
>       c=IN IP4 192.0.2.1
> 
> Thanks in advance.

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