i upgraded Asterisk to 18.0.1, still this same issue
dmesg shows this
[Tue Nov 17 14:56:01 2020] conntrack: generic helper won’t handle protocol 47. Please consider loading the specific helper module.
[Tue Nov 17 17:32:05 2020] asterisk[5829]: segfault at 18 ip 00007f6743ab18b8 sp 00007f6693492ba0 error 4 in libasteriskpj.so.2[7f67439d7000+ea000]
[Tue Nov 17 17:32:05 2020] Code: 89 45 40 c7 45 48 01 00 00 00 eb d0 66 0f 1f 44 00 00 41 54 4c 8d 67 50 55 53 48 89 fb 48 8b 6f 58 49 39 ec 74 16 0f 1f 40 00 <48> 8b 7d 18 e8 cf 6b f2 ff 48 8b 6d 08 49 39 ec 75 ee 48 83 7b 40