[OpenSIPS-Users] Registrant & LB with SRV

[Bogdan-Andrei Iancu]

Hi Antonios,

why not, as Walter suggested, grabbing the A records behind the SRV 
record and register and balance explicitly to them....

Regards,

Bogdan-Andrei Iancu

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

On 23.06.2025 11:38, Antonios Psaras wrote:
>
> Thank you Walter for your reply.
>
> Unfortunately there is no way to change Carrier’s configuration so we 
> need to find a way to tackle the issue on our side.
>
> Thanks again.
>
> Regards
>
> *From:* Walter Schober <walter.schober at neotel.at>
> *Sent:* Δευτέρα, 23 Ιουνίου 2025 10:37
> *To:* OpenSIPS users mailling list <users at lists.opensips.org>
> *Cc:* apsaras at microbase.gr
> *Subject:* AW: [OpenSIPS-Users] Registrant & LB with SRV
>
> Hello Antonis!
>
> IMHO the carrier cannot expect Register and Invite going to the same 
> destination if the SRV for _/the/_ service is load-balanced.
>
> We do offer such a service as carrier also but encountered the issue 
> with LB on nearly every device, incl. phones. Since we also need the 
> call to be established across the same service endpoint selected in 
> the Register process we set priorities on each SRV for each datacenter.
>
> For such cases we do additionally name two A records where the 
> endpoint must register on both and then can do LB calls to each. 
> Otherwise the carriers service must allow registers and invites going 
> different ways. It is **one** service based on the SRV entry!
>
> Br
>
> Walter
>
> *Von:*Users <users-bounces at lists.opensips.org> *Im Auftrag von 
> *Antonios Psaras
> *Gesendet:* Freitag, 20. Juni 2025 11:24
> *An:* 'OpenSIPS users mailling list' <users at lists.opensips.org>
> *Betreff:* [OpenSIPS-Users] Registrant & LB with SRV
>
> Hello Team
>
> I have the following situation.
>
> A telecom carrier requires SIP Registration prior to Dial out using 
> SIP Domain and SRV Lookup.
>
> To achieve that I am using registrant module and load balancing module.
>
> The problem I have, is that in some cases registrant registers on 
> different SBC of the Carrier than the one resolved by Load Balancer 
> Module so my outbound calls are failing with 407.
>
> I have two thoughts but I do not know how to implement any of those.
>
>  1. Instead of using LB Modules, I will some how get the registrar IP
>     from registrant module and statically route the calls through
>     that. Is there a way to get that information from registrant module?
>  2. DNS lookup is done automatically only in case of 503 or timeout.
>     Is there a way to force DNS lookup with in OpenSIP Script? If yes
>     I can handle 407, force DNS Lookup, create a new branch and
>     re-send the call.
>
> Any other thoughts are welcome
>
> Best regards
>
> Antonis Psaras
>
>
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