IPv6 in SDP

[oej]

When sending an OFFER with IPv6 in the SDP to a baresip that's IPv4 only, Baresip responds 200 OK with IPv4 in the SDP. We get no media - of course.

RFC 6157 speaks clearly about this (and updates 3264):
" 2. Each media description in the SDP answer MUST use the same
network type as the corresponding media description in the offer.
Thus, if the applicable "c=" line for a media description in the
offer contained a network type with the value "IP4", the
applicable "c=" line for the corresponding media description in
the answer MUST contain "IP4" as the network type. Similarly, if
the applicable "c=" line for a media description in the offer
contained a network type with the value "IP6", the applicable
"c=" line for the corresponding media description in the answer
MUST contain "IP6" as the network type.
"

[alfredh]

Olle, could you please try latest baresip from github and see if it works as expected?