ERROR: t_should_relay_response: status rewrite by UAS: stored: 491, received: 200

Hello. I use UAC module for trunks form 4.2 master branch. I have an error when endpoit at the trunk picked up. OK reply never  replied to caller because I see next error:

ERROR: t_should_relay_response: status rewrite by UAS: stored: 491, received: 200
So as I see before reply 200 sended to kamailio (from callee) I see packet with 491 SIP code. It is strange because at the another server (same configuration) OK successfully sended to caller and session is Ok...