Probleme OTB - telephonie VOIP

Bonjour,

Nous sommes client OTB, mais nous rencontrons de gros problèmes de téléphonie.
les téléphones YEalink affichent "Not registered" régulièrement, et les communications sont de mauvaise qualité.

Quand je regarde les logs de la OTB je constate des erreurs:

Fri Sep 20 00:04:23 2019 daemon.err ss-redir[3561]: 2019-09-20 00:04:23 ERROR: server recv: Host is unreachable
Fri Sep 20 00:04:23 2019 daemon.err ss-redir[3564]: 2019-09-20 00:04:23 ERROR: server recv: Host is unreachable
Fri Sep 20 00:28:12 2019 daemon.err ss-redir[3562]: 2019-09-20 00:28:12 ERROR: server recv: Host is unreachable
Fri Sep 20 00:40:04 2019 daemon.err ss-redir[3562]: 2019-09-20 00:40:04 ERROR: server recv: Operation timed out
Fri Sep 20 00:47:03 2019 daemon.err ss-redir[3564]: 2019-09-20 00:47:03 ERROR: server recv: Operation timed out
Fri Sep 20 00:50:56 2019 daemon.info ss-redir-track: Shadowsocks is down
Fri Sep 20 00:50:56 2019 user.info ss-redir-initd: Unplugging shadowsocks cable...
Fri Sep 20 00:51:06 2019 daemon.info ss-redir-track: Shadowsocks is up
Fri Sep 20 00:51:06 2019 user.info ss-redir-initd: Plugging shadowsocks cable in...
Fri Sep 20 00:53:27 2019 daemon.err ss-redir[3563]: 2019-09-20 00:53:27 ERROR: server recv: Operation timed out
Fri Sep 20 01:05:14 2019 daemon.err ss-redir[3561]: 2019-09-20 01:05:14 ERROR: server recv: Operation timed out
Fri Sep 20 01:08:18 2019 daemon.err ss-redir[3563]: 2019-09-20 01:08:18 ERROR: server recv: Operation timed out
Fri Sep 20 01:09:40 2019 daemon.err ss-redir[3562]: 2019-09-20 01:09:40 ERROR: server recv: Operation timed out
Fri Sep 20 01:09:56 2019 daemon.err ss-redir[3561]: 2019-09-20 01:09:56 ERROR: server recv: Operation timed out
Fri Sep 20 01:19:34 2019 daemon.err ss-redir[3564]: 2019-09-20 01:19:34 ERROR: server recv: Host is unreachable
Fri Sep 20 01:19:34 2019 daemon.err ss-redir[3563]: 2019-09-20 01:19:34 ERROR: server recv: Host is unreachable
Fri Sep 20 01:27:30 2019 daemon.err ss-redir[3564]: 2019-09-20 01:27:30 ERROR: server recv: Operation timed out
Fri Sep 20 01:27:30 2019 daemon.err ss-redir[3561]: 2019-09-20 01:27:30 ERROR: server recv: Operation timed out
Fri Sep 20 01:27:30 2019 daemon.err ss-redir[3564]: 2019-09-20 01:27:30 ERROR: server recv: Operation timed out
Fri Sep 20 01:27:30 2019 daemon.err ss-redir[3561]: 2019-09-20 01:27:30 ERROR: server recv: Operation timed out
Fri Sep 20 01:27:30 2019 daemon.err ss-redir[3561]: 2019-09-20 01:27:30 ERROR: server recv: Operation timed out
Fri Sep 20 01:27:35 2019 daemon.err ss-redir[3561]: 2019-09-20 01:27:35 ERROR: server recv: Operation timed out
Fri Sep 20 01:33:29 2019 daemon.err ss-redir[3561]: 2019-09-20 01:33:29 ERROR: server recv: Operation timed out
Fri Sep 20 01:33:59 2019 daemon.err ss-redir[3563]: 2019-09-20 01:33:59 ERROR: server recv: Operation timed out
Fri Sep 20 01:43:03 2019 daemon.err ss-redir[3562]: 2019-09-20 01:43:03 ERROR: server recv: Host is unreachable
Fri Sep 20 01:51:28 2019 daemon.info ss-redir-track: Shadowsocks is down
Fri Sep 20 01:51:28 2019 user.info ss-redir-initd: Unplugging shadowsocks cable...
Fri Sep 20 01:51:38 2019 daemon.info ss-redir-track: Shadowsocks is up
Fri Sep 20 01:51:38 2019 user.info ss-redir-initd: Plugging shadowsocks cable in...
Fri Sep 20 02:41:04 2019 daemon.err ss-redir[3563]: 2019-09-20 02:41:04 ERROR: server recv: Operation timed out
Fri Sep 20 02:41:19 2019 daemon.err ss-redir[3561]: 2019-09-20 02:41:19 ERROR: server recv: Host is unreachable
Fri Sep 20 02:41:19 2019 daemon.err ss-redir[3561]: 2019-09-20 02:41:19 ERROR: server recv: Host is unreachable
Fri Sep 20 02:41:19 2019 daemon.err ss-redir[3561]: 2019-09-20 02:41:19 ERROR: server recv: Host is unreachable
Fri Sep 20 02:41:19 2019 daemon.err ss-redir[3561]: 2019-09-20 02:41:19 ERROR: server recv: Host is unreachable
Fri Sep 20 02:54:17 2019 daemon.err ss-redir[3561]: 2019-09-20 02:54:17 ERROR: server recv: Operation timed out
Fri Sep 20 03:05:07 2019 daemon.err ss-redir[3563]: 2019-09-20 03:05:07 ERROR: server recv: Host is unreachable
Fri Sep 20 03:06:14 2019 daemon.err ss-redir[3564]: 2019-09-20 03:06:14 ERROR: server recv: Operation timed out
Fri Sep 20 03:09:08 2019 daemon.err ss-redir[3563]: 2019-09-20 03:09:08 ERROR: server recv: Operation timed out
Fri Sep 20 03:19:28 2019 daemon.err ss-redir[3563]: 2019-09-20 03:19:28 ERROR: server recv: Operation timed out
Fri Sep 20 03:28:05 2019 daemon.err ss-redir[3564]: 2019-09-20 03:28:05 ERROR: server recv: Operation timed out
Fri Sep 20 03:28:20 2019 daemon.err ss-redir[3562]: 2019-09-20 03:28:20 ERROR: server recv: Operation timed out
Fri Sep 20 03:28:25 2019 daemon.err ss-redir[3564]: 2019-09-20 03:28:25 ERROR: server recv: Operation timed out
Fri Sep 20 03:28:30 2019 daemon.err ss-redir[3562]: 2019-09-20 03:28:30 ERROR: server recv: Operation timed out
Fri Sep 20 03:28:36 2019 daemon.err ss-redir[3562]: 2019-09-20 03:28:36 ERROR: server recv: Operation timed out
Fri Sep 20 03:28:46 2019 daemon.err ss-redir[3563]: 2019-09-20 03:28:46 ERROR: server recv: Operation timed out
Fri Sep 20 03:34:24 2019 daemon.err ss-redir[3564]: 2019-09-20 03:34:24 ERROR: server recv: Operation timed out
Fri Sep 20 04:41:59 2019 daemon.err ss-redir[3563]: 2019-09-20 04:41:59 ERROR: server recv: Operation timed out
Fri Sep 20 04:55:07 2019 daemon.err ss-redir[3564]: 2019-09-20 04:55:07 ERROR: server recv: Operation timed out
Fri Sep 20 04:57:15 2019 daemon.err ss-redir[3563]: 2019-09-20 04:57:15 ERROR: server recv: Operation timed out
Fri Sep 20 04:57:36 2019 daemon.err ss-redir[3564]: 2019-09-20 04:57:36 ERROR: server recv: Operation timed out
Fri Sep 20 04:57:46 2019 daemon.err ss-redir[3562]: 2019-09-20 04:57:46 ERROR: server recv: Operation timed out
Fri Sep 20 04:57:56 2019 daemon.err ss-redir[3563]: 2019-09-20 04:57:56 ERROR: server recv: Operation timed out
Fri Sep 20 05:07:09 2019 daemon.err ss-redir[3562]: 2019-09-20 05:07:09 ERROR: server recv: Operation timed out
Fri Sep 20 05:10:03 2019 daemon.err ss-redir[3562]: 2019-09-20 05:10:03 ERROR: server recv: Operation timed out
Fri Sep 20 05:12:32 2019 daemon.err ss-redir[3562]: 2019-09-20 05:12:32 ERROR: server recv: Operation timed out
Fri Sep 20 05:12:47 2019 daemon.err ss-redir[3562]: 2019-09-20 05:12:47 ERROR: server recv: Operation timed out
Fri Sep 20 05:12:52 2019 daemon.err ss-redir[3561]: 2019-09-20 05:12:52 ERROR: server recv: Operation timed out
Fri Sep 20 05:12:57 2019 daemon.err ss-redir[3563]: 2019-09-20 05:12:57 ERROR: server recv: Operation timed out
Fri Sep 20 05:20:23 2019 daemon.err ss-redir[3564]: 2019-09-20 05:20:23 ERROR: server recv: Operation timed out
Fri Sep 20 05:22:41 2019 daemon.err ss-redir[3562]: 2019-09-20 05:22:41 ERROR: server recv: Operation timed out
Fri Sep 20 05:29:15 2019 daemon.err ss-redir[3563]: 2019-09-20 05:29:15 ERROR: server recv: Operation timed out
Fri Sep 20 05:29:15 2019 daemon.err ss-redir[3562]: 2019-09-20 05:29:15 ERROR: server recv: Operation timed out
Fri Sep 20 05:29:15 2019 daemon.err ss-redir[3562]: 2019-09-20 05:29:15 ERROR: server recv: Operation timed out
Fri Sep 20 05:29:15 2019 daemon.err ss-redir[3562]: 2019-09-20 05:29:15 ERROR: server recv: Operation timed out
Fri Sep 20 05:29:15 2019 daemon.err ss-redir[3561]: 2019-09-20 05:29:15 ERROR: server recv: Operation timed out
Fri Sep 20 05:29:20 2019 daemon.err ss-redir[3561]: 2019-09-20 05:29:20 ERROR: server recv: Operation timed out
Fri Sep 20 05:35:14 2019 daemon.err ss-redir[3562]: 2019-09-20 05:35:14 ERROR: server recv: Operation timed out
Fri Sep 20 05:35:39 2019 daemon.err ss-redir[3562]: 2019-09-20 05:35:39 ERROR: server recv: Operation timed out
Fri Sep 20 05:48:22 2019 daemon.err ss-redir[3564]: 2019-09-20 05:48:22 ERROR: server recv: Operation timed out
Fri Sep 20 06:42:49 2019 daemon.err ss-redir[3562]: 2019-09-20 06:42:49 ERROR: server recv: Operation timed out
Fri Sep 20 06:56:02 2019 daemon.err ss-redir[3563]: 2019-09-20 06:56:02 ERROR: server recv: Operation timed out
Fri Sep 20 07:07:59 2019 daemon.err ss-redir[3562]: 2019-09-20 07:07:59 ERROR: server recv: Operation timed out
Fri Sep 20 07:10:53 2019 daemon.err ss-redir[3563]: 2019-09-20 07:10:53 ERROR: server recv: Operation timed out
Fri Sep 20 07:21:18 2019 daemon.err ss-redir[3564]: 2019-09-20 07:21:18 ERROR: server recv: Operation timed out
Fri Sep 20 07:25:03 2019 daemon.err ss-redir[3561]: 2019-09-20 07:25:03 ERROR: server recv: Operation timed out
Fri Sep 20 07:30:10 2019 daemon.err ss-redir[3563]: 2019-09-20 07:30:10 ERROR: server recv: Operation timed out
Fri Sep 20 07:30:10 2019 daemon.err ss-redir[3563]: 2019-09-20 07:30:10 ERROR: server recv: Operation timed out
Fri Sep 20 07:30:10 2019 daemon.err ss-redir[3561]: 2019-09-20 07:30:10 ERROR: server recv: Operation timed out
Fri Sep 20 07:30:10 2019 daemon.err ss-redir[3561]: 2019-09-20 07:30:10 ERROR: server recv: Operation timed out
Fri Sep 20 07:30:10 2019 daemon.err ss-redir[3562]: 2019-09-20 07:30:10 ERROR: server recv: Operation timed out
Fri Sep 20 07:30:15 2019 daemon.err ss-redir[3564]: 2019-09-20 07:30:15 ERROR: server recv: Operation timed out
Fri Sep 20 07:44:41 2019 daemon.err ss-redir[3564]: 2019-09-20 07:44:41 ERROR: server recv: Operation timed out
Fri Sep 20 08:44:04 2019 daemon.err otb-tracker[3367]: awk: unrecognized option: 1
Fri Sep 20 08:44:04 2019 daemon.err otb-tracker[3367]: BusyBox v1.27.2 () multi-call binary.
Fri Sep 20 08:44:04 2019 daemon.err otb-tracker[3367]:
Fri Sep 20 08:44:04 2019 daemon.err otb-tracker[3367]: Usage: awk [OPTIONS] [AWK_PROGRAM] [FILE]...
Fri Sep 20 08:44:04 2019 daemon.err otb-tracker[3367]:
Fri Sep 20 08:44:04 2019 daemon.err otb-tracker[3367]: -v VAR=VAL Set variable
Fri Sep 20 08:44:04 2019 daemon.err otb-tracker[3367]: -F SEP Use SEP as field separator
Fri Sep 20 08:44:04 2019 daemon.err otb-tracker[3367]: -f FILE Read program from FILE
Fri Sep 20 08:44:04 2019 daemon.err otb-tracker[3367]: -e AWK_PROGRAM
Fri Sep 20 08:46:59 2019 user.notice post-tracking-otb-autoroute: del rule matching 0x7874756e using table 101 and pref 30000
Fri Sep 20 08:46:59 2019 user.notice post-tracking-store-state: xtun0 tracking status changed to ERROR
Fri Sep 20 08:47:22 2019 user.notice post-tracking-otb-autoroute: add rule matching 0x7874756e using table 101 and pref 30000
Fri Sep 20 08:47:22 2019 user.notice post-tracking-store-state: xtun0 tracking status changed to OK
Fri Sep 20 08:52:26 2019 daemon.err ss-redir[3561]: 2019-09-20 08:52:26 ERROR: server recv: Operation timed out
Fri Sep 20 08:56:26 2019 daemon.err ss-redir[3564]: 2019-09-20 08:56:26 ERROR: send: Connection reset by peer
Fri Sep 20 08:56:57 2019 daemon.err ss-redir[3563]: 2019-09-20 08:56:57 ERROR: server recv: Operation timed out
Fri Sep 20 09:11:48 2019 daemon.err ss-redir[3561]: 2019-09-20 09:11:48 ERROR: server recv: Operation timed out
Fri Sep 20 09:12:33 2019 daemon.err ss-redir[3561]: 2019-09-20 09:12:33 ERROR: remote recv: Connection reset by peer
Fri Sep 20 09:14:42 2019 daemon.info ss-redir-track: Shadowsocks is down
Fri Sep 20 09:14:42 2019 user.info ss-redir-initd: Unplugging shadowsocks cable...
Fri Sep 20 09:14:52 2019 daemon.info ss-redir-track: Shadowsocks is up
Fri Sep 20 09:14:52 2019 user.info ss-redir-initd: Plugging shadowsocks cable in...
Fri Sep 20 09:17:14 2019 daemon.err ss-redir[3561]: 2019-09-20 09:17:14 ERROR: server recv: Host is unreachable
Fri Sep 20 09:22:08 2019 daemon.err ss-redir[3562]: 2019-09-20 09:22:08 ERROR: server recv: Operation timed out
Fri Sep 20 09:22:38 2019 user.notice post-tracking-otb-autoroute: del rule matching 0x7874756e using table 101 and pref 30000
Fri Sep 20 09:22:38 2019 user.notice post-tracking-store-state: xtun0 tracking status changed to ERROR
Fri Sep 20 09:22:52 2019 user.notice post-tracking-otb-autoroute: add rule matching 0x7874756e using table 101 and pref 30000
Fri Sep 20 09:22:52 2019 user.notice post-tracking-store-state: xtun0 tracking status changed to OK
Fri Sep 20 09:23:21 2019 user.notice post-tracking-otb-autoroute: del rule matching 0x7874756e using table 101 and pref 30000
Fri Sep 20 09:23:21 2019 user.notice post-tracking-store-state: xtun0 tracking status changed to ERROR
Fri Sep 20 09:23:24 2019 user.notice post-tracking-otb-autoroute: add rule matching 0x7874756e using table 101 and pref 30000
Fri Sep 20 09:23:24 2019 user.notice post-tracking-store-state: xtun0 tracking status changed to OK
Fri Sep 20 09:23:42 2019 user.notice post-tracking-otb-autoroute: del rule matching 0x7874756e using table 101 and pref 30000
Fri Sep 20 09:23:42 2019 user.notice post-tracking-store-state: xtun0 tracking status changed to ERROR
Fri Sep 20 09:23:46 2019 user.notice post-tracking-otb-autoroute: add rule matching 0x7874756e using table 101 and pref 30000
Fri Sep 20 09:23:46 2019 user.notice post-tracking-store-state: xtun0 tracking status changed to OK
Fri Sep 20 09:36:59 2019 daemon.err ss-redir[3562]: 2019-09-20 09:36:59 ERROR: server recv: Operation timed out
Fri Sep 20 09:43:53 2019 daemon.err ss-redir[3563]: 2019-09-20 09:43:53 ERROR: server recv: Operation timed out
Fri Sep 20 09:46:59 2019 user.notice post-tracking-otb-autoroute: del rule matching 0x7874756e using table 101 and pref 30000
Fri Sep 20 09:46:59 2019 user.notice post-tracking-store-state: xtun0 tracking status changed to ERROR
Fri Sep 20 09:47:02 2019 user.notice post-tracking-otb-autoroute: add rule matching 0x7874756e using table 101 and pref 30000
Fri Sep 20 09:47:02 2019 user.notice post-tracking-store-state: xtun0 tracking status changed to OK
Fri Sep 20 09:51:19 2019 daemon.err ss-redir[3562]: 2019-09-20 09:51:19 ERROR: server recv: Operation timed out
Fri Sep 20 09:55:41 2019 user.notice post-tracking-otb-autoroute: del rule matching 0x7874756e using table 101 and pref 30000
Fri Sep 20 09:55:41 2019 user.notice post-tracking-store-state: xtun0 tracking status changed to ERROR
Fri Sep 20 09:55:52 2019 user.notice post-tracking-otb-autoroute: add rule matching 0x7874756e using table 101 and pref 30000
Fri Sep 20 09:55:52 2019 user.notice post-tracking-store-state: xtun0 tracking status changed to OK
Fri Sep 20 09:58:43 2019 daemon.info glorytun-udp: starting glorytun-udp instance xtun0
Fri Sep 20 09:58:43 2019 user.info ss-redir-initd: Starting service...
Fri Sep 20 09:58:44 2019 user.warn ss-redir-initd: Skipping strange static route with missing gateway or target...
Fri Sep 20 09:58:44 2019 user.notice otb-qos: stopping QoS
Fri Sep 20 09:58:44 2019 user.notice otb-qos: upload QoS deleted on eth0.3 [wan13]
Fri Sep 20 09:58:44 2019 user.notice otb-qos: upload QoS deleted on eth0.4 [wan14]
Fri Sep 20 09:58:44 2019 user.notice otb-qos: starting QoS
Fri Sep 20 09:58:44 2019 user.notice otb-qos: setting upload QoS on eth0.3 [wan13] to 59080kbps
Fri Sep 20 09:58:44 2019 user.notice otb-qos: QoS is not present, setting it up on eth0.3
Fri Sep 20 09:58:44 2019 user.notice otb-qos: sending download QoS on eth0.3 [wan13] - maximum download 91400kbps
Fri Sep 20 09:58:44 2019 user.notice otb-qos: setting upload QoS on eth0.4 [wan14] to 523kbps
Fri Sep 20 09:58:44 2019 user.notice otb-qos: QoS is not present, setting it up on eth0.4
Fri Sep 20 09:58:44 2019 user.notice otb-qos: sending download QoS on eth0.4 [wan14] - maximum download 5969kbps
Fri Sep 20 09:58:45 2019 daemon.info glorytun: starting glorytun instance tun0
Fri Sep 20 09:58:46 2019 user.info swconfig: Gathering VLAN facts...
Fri Sep 20 09:58:46 2019 user.info swconfig: Configuring if range 15
Fri Sep 20 09:58:46 2019 user.info swconfig: Setting mode into trunk mode
Fri Sep 20 09:58:46 2019 user.info swconfig: Setting native VID to 1
Fri Sep 20 09:58:47 2019 user.info swconfig: Adding new VIDs 1
Fri Sep 20 09:58:47 2019 user.info ss-redir-initd: Plugging shadowsocks cable in...