Re: Carrier dont manage RR very well

Topos here will help you.
https://www.kamailio.org/docs/modules/stable/modules/topos.html


I use it for this situation and MTU issues


On Sat, 25 Apr 2026, 20:09 Benedito Marques via sr-users, <
[email protected]> wrote:

> Hi,
>     I have a scenario where there is a farm of asterisks behind kamailio.
> For 2 specific carriers, all the outbound calls don't complete. Testing,
> I've noted that when calling out from kamailio with the Record Route
> header, the call is lost (the invite does not return).
>
> kamailio.com:5060   ->  carrier.com:5060
>
> 15:49:35.297529  ->  INVITE (SDP)
>> 15:49:35.437412  <-  100 Trying
>> 15:49:35.437415  <-  100 Giving it a try
>> 15:49:35.437618  <-  407 Proxy Authentication Required
>> 15:49:35.440871  ->  ACK
>> 15:49:35.441864 -> INVITE (SDP)
>> 15:49:35.942011 -> INVITE (SDP) (retransmission)
>> 15:49:36.941995 -> INVITE (SDP) (retransmission)
>> 15:49:38.941693 -> INVITE (SDP) (retransmission)
>> 15:49:42.941991 -> INVITE (SDP) (retransmission)
>
>
> If Record Route is removed, the call completes, but some messages like BYE
> or ACK turn back to asterisks directly, not through kamailio. Using the
> same sip account provided by the carrier in softphones and IP phones, it's
> possible to see that call completes too. The carrier refuses to implement
> the correct solution (treat Record Route headers correctly to complete the
> call), so what is the best approach in this situation? Is the usage of
> topology hiding as an alternative?
>
> --
>
> Att,
> Benedito Marques
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