[Rtcomm] [Rtcomm] [Bug 4014] bad SIP behavior in certain network topology

[From: bugzilla-daemon at maemo.org]

https://bugs.maemo.org/show_bug.cgi?id=4014


aklapper at openismus.com changed:

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                 CC|                            |aklapper at openismus.com




------- Comment #2 from aklapper at openismus.com  2009-01-19 13:04 GMT+3 -------
--- Comment  #52 from Joshua Pritikin     2009-01-13 18:52:02 GMT+3 ---

https://bugs.maemo.org/attachment.cgi?id=1101
tcpdump of sjphone calling tellme

--- Comment  #54 from Mikhail Zabaluev (Nokia) 2009-01-13 19:04:04 GMT+3 ---

Uh-huh, it uses SRV lookups, but doesn't seem to flip between the alternative
servers in the dialogs.
Here's another idea: try "alpha2.callcentric.com" or "alpha7.callcentric.com"
as the outbound proxy.

--- Comment  #56 from Joshua Pritikin     2009-01-14 01:44:49 GMT+3 --- 

https://bugs.maemo.org/attachment.cgi?id=1103
tcpdump using IP for outbound proxy

N810 again. This time I tried using an IP address (i.e. 204.11.192.36) for the
outbound proxy. No improvement.


--- Comment #57 from Joshua Pritikin   2009-01-14 01:53:48 GMT+3 --- 

https://bugs.maemo.org/attachment.cgi?id=1104
tcpdump using IP for outbound proxy and sip:phone at callcentric.com

N810: In this test, I used an IP address for the outbound proxy and phoned the
full sip URI sip:17771234567 at callcentric.com

It seemed to fail in exactly the same way as other attempts.

Another data point: I tried phoning with the N810 today on campus and it
worked. It fails to work when I am at home. At home, I have a 54WRT wireless
router doing NAT with the ISP being University of Oregon (UO). In other words,
there is probably another layer of NAT + filtering for UO when I am calling
from home. Maybe that is why you see a different address in the middle of the
SIP exchange. Maybe the N810 isn't coping with this network topology correctly?


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