[Users] Re: [Devel] openser roadmap

[Dan Pascu]

There is one thing that should be fixed. The problem shows up if one account 
registers multiple times. We observed a scenario where a phone behind NAT did 
register, and with every new register the NAT assigned a different port to 
it. For some reason that phone sent multiple registration requests in a short 
interval (one explanation is that it may have been restarted multiple times 
during some experimentation with internal settings). Anyway, no matter the 
reason, the net result was that because every register request had a 
different source port, the device appeared to SER as multiple devices, and as 
a result there were multiple contacts stored in the subscribers table.
After the number of registrations exceeded some value, SER started to complain 
that some buffer was exceeded and in the reply to the register requests it 
couldn't add all the contacts. Because the contacts were sorted in 
chronological order, the latest were missing.
At this point the phone no longer saw its last contact in the reply and 
considered that it wasn't registered, while SER stored the contact in the 
subscribers table and considered the registration successful.
From this point on, it entered into a spiraling process, the phone re-sending 
registration requests at every 5 seconds, resulting in 120 registrations in 
10 minutes.

One quick fix I think would be to return the contact list in reverse 
chronological order. This would guarantee that the phone will at least see 
it's latest contact and won't enter the spiral of sending register requests 
at every 5 seconds.

A better fix (but probably more complex) would be to limit the number of 
allowed registrations for a given subscriber. That would also avoid issues 
with overflowing the contact list buffer in registration replies.

Limiting the number of registrations allowed for a subscriber also makes sense 
considering that parallel forking can only be done to a limited number of 
contacts.


On Thursday 30 June 2005 20:51, Daniel-Constantin Mierla wrote:
> Hello,
>
> the roadmap to the next release is now posted online:
> http://openser.org/roadmap.php
>
> Time lines are just estimations and could be subject to change, other
> features may be added to the next release. If you have in mind other
> features, send a reply and describe what would be good to have in the
> next release.
>
> Comments are welcome!
>

-- 
Dan