I am using the topos module when bridging 2 networks with Kamailio.

The INVITE/200OK part of the transaction is working fine (i.e. the Contact on both sides matches correctly the corresponding network).

However when the ACK is sent into Kamailio, instead of realising the next hop is myself and skipping it, Kamailio is sending the ACK directly to itself as a packet, causing the call setup to break.

Does anyone have any advice for this situation?