24 May
2007
24 May
'07
9:23 a.m.
Hi Dan!
Some descriptions inline ...
Dan Mechanic wrote:
Forgive me if this question is a little open-ended...
I am new to openser
and sip, and trying to learn all I can...
I am looking for information regarding:
ERROR: append_branch: max nr of branches exceeded
Branches are used by openser for parallel forking. This means a incoming
request will be forwarded to maximum MAX_BRANCHES in parallel.
I understand that this error can be avoided by
increasing the value of
MAX_BRANCHES and recompiling openser, but, I am curious as to what happens
when this error has been reached.
Here's our situation... We use openser, and have a separate openser presence
server. We had a situation recently where it seemed our presence server was
bombarding our proxy to the point where the load on the proxy jumped and
phones became unusable. Taking down the presence server seemed to alleviate
the troubles.
The > ERROR: append_branch: max nr of branches exceeded
has nothing to do with high load over overload at the traffic. (But of
course the overload could have the same reason as the exceeding of
max-branches).
Also, we have an intermittent issue with phone reboots
and lost calls,
particularly on extensions that are on more than 12 phones (MAX_BRANCHES is
currently set to 12).
Maybe the phones can't handle the 12 contacts in the 200 OK reply of the
REGISTER.
So, my question is, is this failure (max nr of branches exceeded) an
innocuous one? or could it lead to futher failures (and maybe sip message
recents... thus the bombardment)... Are there known side affects of this
failure?
Usually this means that either:
- bad config where you accidentally add too much branches
- you have phones which re-REGISTER before the old registration is
expired and openser can not match the new registration to an old
registration - e.g if the call-id in the REGISTER changes ...
Thus I guess the problem happens because your phones reboot and doing a
new registration.
Thus, the phones should be fixed.
You can also try to tweak max_contacts
http://www.openser.org/docs/modules/1.2.x/registrar.html#AEN199
and desc_time_order
http://www.openser.org/docs/modules/1.2.x/usrloc#AEN252
Any info would be appreciated.
Thanks Much!
Best,
Dan Mechanic
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