[SR-Users] topoh ACK Call-ID mismatch

Trying to call a T.38 enabled endpoint B from an endpoint A that doesn't. This results in a "488 Not Acceptable" from A. The kamailio (4.0.3) in between with topoh enabled (with mask_callid set to 1. Kamailio ACKs the 488 to A, but the ACK has the wrong (masked) Call-ID, resulting in the ACK to A being ignored, A keeps sending 488 at intervals before just dropping the call. My understanding is the Call-ID in the ACK has to be the same as the Call-ID from the 488. But instead of sending the unmasked Call-ID used in all other messages between A and Kamailio, the ACK contains the masked Call-ID used in all messagea between A and Kamailio. I can't find a bug report relating to this. Is this a known feature or maybe fixed in newer versions? A->Kamailio SIP/2.0 488 Not acceptable here. Via: SIP/2.0/UDP 109.235.32.40;branch=z9hG4bKf91a.c6c88747.0;received=109.235.32.40. Via: SIP/2.0/UDP 172.19.162.1;branch=pocos- rS4MusXox1l5QHyNxRy6uAXsEOdsxidSEAktxGZKWgeKCgeS- RrKEAy057Nl9DEpWpefZD6AhGtwWDJjEqeuEAZgZs5iZA7*. From: <sip:+31880100799@sip.pocos.nl:5060>;tag=as3869fe2a. To: "+31880100705" <sip:+31880100705@sip.pocos.nl>;tag=as1b0b8097. Call-ID: 0b5946b977210450571f767a19cd6fa0(a)99sip.pocos.nl. CSeq: 102 INVITE. Kamailio<-A ACK sip:+31880100705@109.235.32.48 SIP/2.0. Via: SIP/2.0/UDP 109.235.32.40;branch=z9hG4bKf91a.c6c88747.0. Max-Forwards: 16. From: <sip:+31880100799@sip.pocos.nl:5060>;tag=as3869fe2a. To: "+31880100705" <sip:+31880100705@sip.pocos.nl>;tag=as1b0b8097. Call-ID: !!:xqXtWRMpZAngEsX3xGMtxGrgxDZgEA9JxR4AzGz8ZRIyWR4sh.yomqlACgxoC8K*. CSeq: 102 ACK. -- Telefoon: 088 0100 700 Sales: sales(a)pocos.nl | Service: servicedesk(a)pocos.nl http://www.pocos.nl/ | Croy 9c, 5653 LC Eindhoven | Kamer van Koophandel 17097024