Another SIP dialog / session problem

[Werner Dittmann]

CASE-1

While testing the latest patch (2646) I tried to get my friend to test
the patch. He wasn't at home and didn't answer the phone - thus I got
a voice announcement from sipphone telling me that he has no voicemail.

In the middle of th announcement I pressed the hangup buttom. Then Minsip
started to send BYe again and again. After a while I received a BYE from
sipphone - but minisip didn't stop sending BYE. I can't see why this
happens and the receiver does not nonor our BYE (IMHO the receiver shall
send an OK to the BYE, shouldn't it?).

Traces: refer to text file, Minisip debug output labeled CASE-1 and file
	tcpdump.10


CASE-2

This time my friend answered the phone (can be seen at the OK line, it's
his Gizmo client). Minisip prodices an ACK, this time it seems that the
correct TAG tag is used. What makes me wonder here is: the media line
containes quite a lot of variants to choose from (refer to the first
OK Status. Minisip's debug shows this also. However, there is _no_ line
saying that a receiver was found and/or enabled (as it is the case in
CASE-1 above). Unlike to CASE-1 the whole ALSA stuff was not setup.
In addition the ACK packet sent by minisip does not contain
a selected media. This is IMHO required in the ACK if we can support
one of the media itmes. Otherwise an immediate BYE shall follow the ACK.

As can be seen in tcpdump.11 my friend's Gizmo resends the OK to get
a valid ACK that contains our SDP. In CASE-1 the responder already narrowed
down the media selection to one item in the OK already. Thus sending
an ACK without further info is ok.

Traces: refer to text file, Minisip debug output labeled CASE-2 and file
	tcpdump.11

I packed the trace files (1 text file, 2 tcpdump files) in a tar and
compressed with gzip.

Regards,
Werner
-------------- next part --------------
A non-text attachment was scrubbed...
Name: sessionProblem-2.tar.gz
Type: application/x-gzip
Size: 155120 bytes
Desc: not available
Url : http://lists.minisip.org/pipermail/minisip-devel/attachments/20060608/68883b60/sessionProblem-2.tar-0001.bin