[OpenSIPS-Users] opensips1.6.1 and Polycom BLA

[Anca Vamanu]

Hi Steven,

Thank you for the in dept analysis of the problem. I have now checked 
the implementation for BLA in opensips and here is the state of OpenSIPS 
BLA from in what those two sections are concerned.
8.2 - Subscription timeout
OpenSIPS BLA sends Subscription when Register messages are received or 
when a registration timeouts. So the case when a Subscribe message is 
not replied can only happen if in the short period when the phone sent 
the Register and OpenSIPS sent the Subscribe went down - and there is 
really very little change this will happen.
8.3 - Notify race condition
The implementation does not handle this case as mentioned in the draft, 
and this could be a problem( maybe exactly the problem that you are 
seeing). OpenSIPS will overwrite the state with the second call, and 
maybe in the mean time the phone that have sent the first Notify has 
already started the call. I will have to work a bit in this part and 
make the logic more strong.

Thanks and regards,

-- 
Anca Vamanu
www.voice-system.ro


Steven C. Blair wrote:
> Does anyone have any experience with Polycom phones, BLA using OpenSIPS as the state agent? If so I'm wondering if you can talk to a few points in the draft RFC? 
>
> http://tools.ietf.org/html/draft-anil-sipping-bla-02#section-8.2
>
> Section 8.3, line seize race condition, seems to describe our current issue as the user sees it. Section 8.2, Line seize notifier failure, seems to describe what we are seeing in logs. Can anyone talk to how Polycom and OpenSIPS handles these two conditions? Does anyone have any hands-on experience with these types of problems in an operational setting?
>
> Thanks,Steve
>
> -----Original Message-----
> From: users-bounces at lists.opensips.org [mailto:users-bounces at lists.opensips.org] On Behalf Of Steven C. Blair
> Sent: Monday, February 08, 2010 10:19 AM
> To: OpenSIPS users mailling list
> Subject: Re: [OpenSIPS-Users] opensips1.6.1 and Polycom BLA
>
>
> Anca,
>
>  You are too quick.:-) I was about to send an update saying I found the problem. Thanks but please disregard this message
>
> -----Original Message-----
> From: users-bounces at lists.opensips.org [mailto:users-bounces at lists.opensips.org] On Behalf Of Anca Vamanu
> Sent: Monday, February 08, 2010 9:59 AM
> To: OpenSIPS users mailling list
> Subject: Re: [OpenSIPS-Users] opensips1.6.1 and Polycom BLA
>
> Hi Steven,
>
> Could you please investigate more into the problem that you are noticing?
> Do you see any errors in the log? Increase the log level to see the 
> debug messages and check what in the following steps in the processing:
> 1. when register is received and you have called bla_set_flag on it - 
> you should see the pua_bla module sending a Subscribe message to the phone
> 2. when the notify is received from the phone - the pua_bla module 
> should send a Publish with that information
> 3. also check if there is any Subscribe message for event: dialog;sla 
> received from the phone.
>
> Regards,
>
>