Grandstream HandyTone 503 BT (UK) Caller ID / Display Settings

After fiddling with the settings for Caller ID on my FXO port, I finally found something that works: Caller ID Scheme: SIN 227 – BT FSK Caller ID Minimum RX Level (dB): -40 FSK Caller ID Seizure Bits: 96 FSK Caller ID Mark Bits: 55 Caller ID Transport Type: Relay via SIP From If you […]

Asterisk 11 (FreePBX distribution) fail2ban configuration using the security log.

I’ve been experimenting with Asterisk again, using the FreePBX distro ( I have noticed that I get a lot of entries in the Asterisk log that look like this: [2013-07-06 05:11:06] NOTICE[4106][C-0000001f] chan_sip.c: Failed to authenticate device 555<>;tag=e9a98a30 [2013-07-06 05:11:08] NOTICE[4106][C-00000020] chan_sip.c: Failed to authenticate device 555<>;tag=eebd8857 [2013-07-06 05:11:12] NOTICE[4106][C-00000021] chan_sip.c: Failed to authenticate device […]

The New Server

For some years now I have been running a VPS system to host my email, my website and the placeholder for the website, it has also served me as Linux launchpad and a mini-test/lab platform. I had started off on the lowest tier and over time upgraded to a tier 4 VPS. It, however, was […]