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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