Hello, Inserted record to uacreg table, started kamailio and seeing this with tcpdump : 00:50:38.312534 IP (tos 0x0, ttl 57, id 3428, offset 0, flags [none], proto UDP (17), length 441) 8X.XXX.XXX.XX.5060 > 7X.XX.XXX.XXX.5060: SIP, length: 413 REGISTER sip:demo.host.com SIP/2.0 Via: SIP/\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00\0x00 .... As you can see - register header starts as normal, but suddenly filled with zeroes by kamailio till the packet end. What can be the problem ? Tried to define UAC_OLD_AUTH in uac_reg.c with no effect. Seems like uacreg logic is broken in git. Rus