[Users] lot of BYEs missing

[Klaus Darilion]

Jayesh Nambiar wrote:
> Hi folks,
> I've been using openser for last one year and its working fine. Recently 
> I upgraded my openser to 1.1 stable release which allows me to have more 
> features.
> But for the last 15 days I have had many discrepencies in the 
> accounting. Among 40 clients to whom we provide service, there was one 
> client who had around 15,000 INVITEs without BYEs in a single day. The 
> UA is a Cisco Gateway.
> I am aware of BYEs being missed with openser, but there used to be 
> hardly 2% Byes missing. This is very unusual to me and I suffered huge 
> losses due to this behaviour as all the calls were passed to a pstn gateway.
> The method of authentication that we use for these clients are IP based 
> authentication. I use the function allow_trusted() to get the clients 
> authenticated and make calls. These calls are sent to some Tier1 
> carriers for pstn termination.
> 
> I wanted to take some expert advice on this issue.
> - Is there any way that the UA can bypass the Openser after sending 
> INVITE to openser even after record routing function is incorporated in 
> the script.

If the gateway accepts SIP messages only from the SIP proxy, then the 
client can not bypass the SIP proxy. Make sure to account loose_route 
requests and failed requests as well. In my case check for a to-tag 
after loose_route. Thus, if for any reason the loose_route function did 
not catched the in dialog request, I log this event to identify broken 
clients.

> - Is there a way that the UA can disconnect calls without sending BYEs 
> to the openser.

The gateway should be configured to send BYE in any case (RTP timeout, 
SIP session timer timeout).

> 
> - Are there many risks involved in IP based authentication? I am using 
> IP based authentication as these clients only want to call, they dont 
> want to be called.

Yes, if you use UDP. UDP can easily be spoofed. Never use IP based 
authentication with UDP!

> - If this was a problem with all the UAs, I would have thought that 
> there must be some problem with my openser configuration, but this is 
> with one particular client. The same Cisco gateway at other places work 
> perfectly with hardly 1-2% BYEs missing which is affordable.
> This indicates that someone must have intentionaly done this.

Or the customers SIP client was going mad. SIP phones can behave quite 
strange sometimes.

regards
klaus

> If someone has come across this problem earlier please share it with me.
> 
> The query I used to find the INVITEs without BYEs is as follows:
> SELECT
>         t1.from_uri as orig_number,
>         t1.to_uri as term_number,
>         DATE_FORMAT(t1.timestamp, '%a %b %D %Y, %h:%i:%s %p') as
> calldate,
>         t1.sip_callid as callid
>  FROM
>         acc t1
>  WHERE
>         t1.sip_method='INVITE' AND
>         t1.sip_callid NOT IN (SELECT t2.sip_callid FROM acc t2 WHERE
>  t2.sip_method = 'BYE').
> 
> Thanks a lot in advance...
> 
> w/regards,
> jayesh
> 
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