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 <[email protected]>
*Sent:* Δευτέρα, 23 Ιουνίου 2025 10:37
*To:* OpenSIPS users mailling list <[email protected]>
*Cc:* [email protected]
*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 <[email protected]> *Im Auftrag von
*Antonios Psaras
*Gesendet:* Freitag, 20. Juni 2025 11:24
*An:* 'OpenSIPS users mailling list' <[email protected]>
*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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