When access side TLS, calls towards access doesn't work

Hello all,

I have following setup:

- on access side I have sip-interface configured with TLS profile, with registration

- on core side there is pure SIP/UDP connection

When there is a call from this access side with TLS signaling encryption everything works fine, sip user is properly registered and calls are established, on access side there is TLS and on core side, between ACME and softswitch, there is a SIP/UDP connection.

But, when there is a call towards this access endpoint, from core side, ACME cannot handle this call, is not able to find route, and after timeout calls are cancelled from core side. (INVITE is not sent from ACME towards access side)