[SIPForum-discussion] SIP and IPv4 mapped IPv6 addresses

[Prashantm at digilink.in]

Hi,

Assume that one IPv4 user agent is communicating with one IPv6 user agent. 
As per RFC 2553 - section 3.7, when the IPv6 server is listening on 0::0 
and port 5060 and it receives a UDP packet over IPv4, linux kernel 
understands that the packet came from IPv4 device. So it informs server 
with a IPv4 mapped IPv6 address of the destination. But still the SIP 
packet will be IPv4. 

My question is which is the case when SIP packet will have IPv4 mapped 
IPv6 addresses? I want to know the use case of IPv4 mapped IPv6 addresses 
in SIP.
 
Regards,
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