Re: [OpenSIPStack] OpenSBC terminate connection

[<jo...@op...>]

Andre,

This is a known problem area in OpenSBC.  Since we are a B2BUA and not a 
proxy we terminate our dialogs based on successful processing of a BYE 
request.  OpenSBC does not wait for a final response before it destroys 
connections.  This ensures that the SBC does not end up with ghost 
sessions as well if a certain UA is not able to handle authenticated BYE 
requests.  This is the second time I have received this report regarding 
this problem.  Can you provide me a with a level 5 log for this 
problematic call offlist?  I'll see if an easy workaround is possible.  
If you could, please also attach a wire shark capture of the successful 
call you made using a UA directly calling your softswitch.  My e-mail 
address is jo...@op...

Joegen

André Mamitzsch wrote:
> Hello,
>
> I have seen a strange behavior with the OpenSBC1.1.5RC1. The scenario is 
> as follows:
>
> The OpenSBC is configured in B2BUAUpperReg mode.
>
> I place a call from a SIP client (A) to a PSTN Phone (B). The connection 
> is established whithout any problems. A goes on hook and sends a BYE to 
> which the SBC immediately replies with a 200 OK.
>
> Another BYE message is being sent out to the softswitch platform.
>
> The softswitch challenges authentication and therefore responds with a 
> 401  unauthorized message. Since the SBC, at least that's my assumption, 
> has already successfully terminated the internal connection there is no 
> match and the requested authenticated BYE will never be send out. This 
> behavior results in ghost connections and the billing runs until B goes 
> on-hook as well.
>
> I have tested the same scenario with my SIP client directly connected to 
> our softswitch platform and did not detect the problem there. Upon 
> receiving the 401 unauthorized message, the client resends the BYE 
> containing the authentication information.
>
> I have checked the RFC 3261 this morning and tried to find out whether 
> it is a regular behavior to reply to a BYE message with authentication 
> challenge or not. I could not find any hint there.
>
> How difficult is it to change this behavior and wait for confirmation 
> before terminating the entire connection ?
>
> Regards,
>
> Andre
>
>
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