Where should I start looking to fault find this? I’m getting choppy audio (FS->External) at the start of a call, which I’m guessing might be connected? 2017-07-03 16:51:00.631873 [DEBUG] switch_rtp.c:1464 [ zrtp utils]: Send <HELLO> ssrc=2371749770 seq=53538 size=148. Stream 2:CLEAR:START 2017-07-03 16:51:00.831873 [DEBUG] switch_rtp.c:1464 [ zrtp utils]: Send <HELLO> ssrc=2371749770 seq=53539 size=148. Stream 2:CLEAR:START 2017-07-03 16:51:01.031875 [DEBUG] switch_rtp.c:1464 [ zrtp utils]: Send <HELLO> ssrc=2371749770 seq=53540 size=148. Stream 2:CLEAR:START 2017-07-03 16:51:01.231873 [DEBUG] switch_rtp.c:1464 [ zrtp utils]: Send <HELLO> ssrc=2371749770 seq=53541 size=148. Stream 2:CLEAR:START 2017-07-03 16:51:01.431886 [DEBUG] switch_rtp.c:1464 [ zrtp utils]: Send <HELLO> ssrc=2371749770 seq=53542 size=148. Stream 2:CLEAR:START 2017-07-03 16:51:01.631874 [DEBUG] switch_rtp.c:1464 [ zrtp utils]: Send <HELLO> ssrc=2371749770 seq=53543 size=148. Stream 2:CLEAR:START 2017-07-03 16:51:01.831873 [DEBUG] switch_rtp.c:1464 [ zrtp engine]: WARNING! HELLO Max retransmissions count reached (20 retries). ID=2 2017-07-03 16:51:01.831873 [DEBUG] switch_rtp.c:1464 [ zrtp]: Stream ID=2 CLEAR switching <START> ---> <NOZRTP>.