Carrier dont manage RR very well

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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