Smarthub2 horrendous siren sound

[jgtaylor42]

My elderly mother was forced to do the digital switch over a few weeks ago. New smarthub2 router. 

This weekend she returned home to what "sounded like a police siren going off " in her lounge. As loud as a fire alarm. It was the Smarthub2 router and the sound only stopped when she turned the power off at the wall. No router sounds since and broadband working ok. 

Has anyone else experienced this? 

She now has no confidence in the router so turns it off when ever she leaves the flat or when she goes to bed. 

[Keith_Beddoe]

@jgtaylor42 

The sound would have been coming from one of the phones that had been left off the hook, or not been disconnected after the last call.

Its a sound coming from the network to indicate that the line has not been cleared down. 

If it happens again, ask her to check which phone its coming from, and replace the handset.

[jgtaylor42]

Thank you so much for your reply.

I had wondered if it was the phone not the router as phones are more likely to be able to emit that kind of sound. They are right next to each other so I could imagine her wrongly mixing up the source. 

But she assures me the sounds was unbearable and would have woken up people in adjacent flats and not just a normal notification when a receiver is not put down correctly. 

We have replaced the brand new BT phone back with the previous BT one and will see what happens. 

Out of interest I went into Smarthub2 technical log and there are lots of entries labelled 00:00 01 Oct when she had the siren sound sometime between the real time of 07:29 05 Dec and 07:47 05 Dec (when she restarted the hub ok). I've looked at the complete technical log for the hub and 00:00 01 Oct has never appeared at any other time on hub restart. Could this be relevant at all?

1236	07:47:33	05 Dec.     5G   WiFi UP
1237	07:47:26	05 Dec. WAN Auto-sensing last connection port: DSL WAN
1238	00:00:16	01 Oct. Booting firmware v0.30.01.08093-BT (Mon Aug 9 20:01:14 2021)
1239	00:00:16	01 Oct. System start Button press (PowerButton)
1240	00:00:16	01 Oct. System up
1241	00:00:09	01 Oct. 2.4G WiFi scan(Reason:boot)
1242	00:00:06	01 Oct. Hub has activated against the device management system
1243	00:00:06	01 Oct. 2.4G WPS feature enabled
1244	00:00:06	01 Oct. 2.4G WPA2 mode selected
1245	00:00:06	01 Oct. 2.4G WiFi UP
1246	00:00:06	01 Oct. 5G   WPS feature enabled
1247	00:00:06	01 Oct. 5G   WPA2 mode selected
1248	00:00:06	01 Oct. 5G   WiFi     UP
1249	23:59:59	30 Sep. WAN Auto-sensing last connection port: DSL WAN
1250	00:00:22	01 Oct. Booting firmware v0.30.01.08093-BT (Mon Aug 9 20:01:14 2021)
1251	00:00:19	01 Oct. System start Button press (PowerButton)
1252	00:00:19	01 Oct. System up
1253	00:00:12	01 Oct. 2.4G WiFi scan(Reason:boot)
1254	00:00:08	01 Oct. Hub has activated against the device management system
1255	00:00:08	01 Oct. 2.4G WPS feature enabled
1256	00:00:08	01 Oct. 2.4G WPA2 mode selected
1257	00:00:08	01 Oct. 2.4G WiFi UP
1258	00:00:08	01 Oct. 5G   WPS feature enabled
1259	00:00:08	01 Oct. 5G   WPA2 mode selected
1260	00:00:08	01 Oct. 5G   WiFi     UP
1261	00:00:00	01 Oct. WAN Auto-sensing last connection port: DSL WAN
1262	07:29:59	05 Dec. SIP p65544t1 SEND 180 INVITE
1263	07:29:59	05 Dec. SIP p65544t1 RECV INVITE
1264	07:17:34	05 Dec. SIP Registration - success
1265	07:00:02	05 Dec. DoS(Port Scanning): IN=ppp1 OUT= MAC= src=125.64.94.145 DST=81.154.66.195 LEN=40 TOS=0x00 PREC=0x00 TTL=240 ID=54321 PROTO=TCP SPT=59246 DPT=391 WINDOW=65535 RES=0x00 SYN URGP=0 MARK=0x8000000

[Keith_Beddoe · Accepted solution]

@jgtaylor42 

This will be the sound https://www.youtube.com/watch?v=2cdos63bN3g

[jgtaylor42]

Thank you again. That sound matches what was heard. 

Not sure why it was so incredibly loud, but hopefully it will not happen again.