|
in this case ua2 will get the return address from the via
header.
It will pickup top most via and send a response to the address given
into the top most via.
Now here because there is no any proxy in between so the only via of
( ua1) becomes the top most via.
-------Original Message-------
Date: Friday, March 29,
2002 01:26:58 AM
Subject:
[Sip-implementors] A basic sip question
Hi,
I am a beginer for sip.
After reading
the rfc,I have some questions.
e.g:
ua1: sip:[EMAIL PROTECTED]:5060
ua2:
sip:[EMAIL PROTECTED]:5061
when
ua1 call ua2,the message would be:
INVITE sip:[EMAIL PROTECTED]:5061
SIP/2.0
v:SIP/2.0/UDP 10.10.1.1
f:sip:[EMAIL PROTECTED]
t:sip:[EMAIL PROTECTED]:5060
i:[EMAIL PROTECTED]
m:[EMAIL PROTECTED]:5061
c:application/sdp
Suppose
there are no proxies between them.
The message should be forworded to
ua2 and ua2 should send a 180 response.
But where does the ua2 get the
adress of ua1?
Via?From?Contact?
I was puzzled after reading the
rfc,because it seems that all above headers is correct.
Which is the
ua2's
chioce?
Thanks!
luoqiang
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