[OpenSIPS-Users] Call center issue in 3.1; call center not working after migration to 3.2

Tue Sep 19 08:42:03 UTC 2023

For the second issue, could you point the GH ticket?

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
   https://www.opensips-solutions.com
   https://www.siphub.com

On 9/19/23 11:35 AM, Kosmas Palios wrote:
> This is indeed the solution, as we figured out by ourselves and as 
> documented in the tm documentation!
>
> Thank you for your kind reply here, as well as at the issue I posted 
> sometime ago i github (my username is kosniaz).
>
> Any input to the second issue (raised on github as well about 10 days 
> ago) would be greatly appreciated!
>
> Thank you very much one more time for your insights.
>
> Have a great day!
>
> Kosmas
>
> Sent from Outlook for iOS <https://aka.ms/o0ukef>
> ------------------------------------------------------------------------
> *From:* Users <users-bounces at lists.opensips.org> on behalf of 
> Bogdan-Andrei Iancu <bogdan at opensips.org>
> *Sent:* Tuesday, September 19, 2023 11:20:23 AM
> *To:* OpenSIPS users mailling list <users at lists.opensips.org>; Kosmas 
> Palios <kosmas.palios at gmail.com>
> *Subject:* Re: [OpenSIPS-Users] Call center issue in 3.1; call center 
> not working after migration to 3.2
>
> 	
> Δεν λαμβάνετε συχνά μηνύματα ηλεκτρονικού ταχυδρομείου από 
> bogdan at opensips.org. Μάθετε γιατί είναι σημαντικό 
> <https://aka.ms/LearnAboutSenderIdentification>
> 	
>
> Hi Kosmas,
>
> For Issue 1, try placing a t_newtran(); before calling the cc function 
> in the script - this will prevent the issues due to retransmissions.
>
> Regards,
> Bogdan-Andrei Iancu
>
> OpenSIPS Founder and Developer
>    https://www.opensips-solutions.com  <https://www.opensips-solutions.com>
>    https://www.siphub.com  <https://www.siphub.com>
> On 7/4/23 1:15 PM, Kosmas Palios wrote:
>>
>> Hello community,
>>
>>
>> Our team has managed to setup a SIP Trunk to forward calls to a 
>> number of SIP clients, in opensips 3.1.16. We are using the call 
>> center module, and it works fine for low traffic. We would like to 
>> ask two separate but related questions.
>>
>>
>> ISSUE 1
>>
>>
>> We are using the call center module to forward calls to 100 SIP 
>> agents, and it works well if traffic is relatively low (about 25 
>> incoming calls per minute). However, when traffic is higher, i.e. up 
>> to 60 incoming calls per minute, we see calls getting rejected 
>> because of cc_handle_call() failing with error message:
>>
>>
>> DBG:b2b_entities:server_new: It is a retransmission, drop
>>
>> ERROR:b2b_logic:b2b_process_scenario_init: failed to create new b2b 
>> server instance
>>
>>
>> Unfortunately, every time this happens, an agent's status gets stuck 
>> to "incall" forever, even though no cc_calls row includes him. So 
>> that agent is lost.
>>
>>
>> We are running in UDP mode, using 6 UDP workers. I’m attaching the 
>> configuration file as opensips_3_1_16.cfg
>>
>> I can share the whole setup if needed.
>>
>>
>> ISSUE 2
>>
>>
>> We decided to migrate to 3.2 after seeing the bugfix to b2b_clients 
>> leak. When we got to migrating the call center, we read this 
>> blogpost: 
>> https://blog.opensips.org/2021/01/06/the-script-driven-sip-b2bua/ 
>> <https://blog.opensips.org/2021/01/06/the-script-driven-sip-b2bua/>
>>
>>
>> " When comes to the modules using the b2b_logicAPI (providing 
>> features on top of the B2B engine), the only affected one is the 
>> call_centermodule. The change is minor – the xml file controlling the 
>> call queuing logic was removed, as not needed any more. Otherwise, in 
>> terms of usage, it is exactly the same."
>>
>>
>> However, when we removed the lines:
>>
>>
>> modparam("b2b_logic_xml","script_scenario", 
>> "/etc/opensips/scenario_callcenter.xml")
>>
>> modparam("call_center", "b2b_scenario", "call center")
>>
>>
>> the call center started behaving weird: it created another invite to 
>> the sip trunk, instead of creating the invite to the agent (the call 
>> id was good, but the to uri was wrong). I can give detailed logs on 
>> this, but I wouldn't want to make this email any bigger than it 
>> already is. I’m also attaching the configuration file as 
>> opensips_3_2_13.cfg
>>
>>
>> To sum up, our questions are:
>>
>>
>> 1. Any ideas on what the problem is with creating a new server 
>> instance for high numbers of calls?
>>
>> 2. What's the recommended way to migrate the call center to version 
>> 3.2 ? Can we find an example script-driven call center somewhere?
>>
>>
>> Thank you in advance for your help!
>>
>> Best regards,
>>
>> Kosmas
>>
>>
>> P.S.: about our team: we are a small team from Athens, Greece 
>> integrating voice assistants on various platforms. Unfortunately we 
>> missed the latest Opensips summit held last September.
>>
>>
>>
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>
>
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