Hello guys, My kamailio version is: version: kamailio 5.1.1 (x86_64/linux) flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC, DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB poll method support: poll, epoll_lt, epoll_et, sigio_rt, select. I am facing a strange bug with TM in case of negative replies. A party sends the invite B party connects the call B party after a few time sends in dialog invite with t38 media. A party rejects the in-dialog invite with 488 Kamailio send ACK to A party(since it is an ACK for negative replies it is build in each hop) The problem in this case is that the ACK sent by kamailio to A party has the callid of kamailio - B party. Since it has a different callid the A party does not recognize the ACK. How can I resolve this issue? Thanks and regards, Rafael -- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/2525