4/29/2023 0 Comments Onsip remove extension from user![]() And anyway, anything more sophisticated is going to require something like Asterisk, and switching my whole phone system over to VoIP, which is not going to be very family-friendly. It’s not exactly the functionality that I want, but the simplicity is beguiling, and it’s trivial to extend it to do something closer to what I do want. Recognised callers are allowed to ring the phone as normal, progressing to an answerphone if necessary. Next I spent some time looking to see what other people have done in this space, and eventually found this webpage, that describes a simple Bash script that intercepts calls that are not on a whitelist, and plays modem tones to them before hanging up. It’s also small, self-powered, cool-running and very reliable. Even better, this is a voice modem too, so it can interact with a caller, sending audio as well as data down the phone line, and recognise touchtones. So first off, I purchased a USR 5637 USB fax modem that is compatible with the UK callerid protocols. So I’m back on the idea of making my own solution to this problem. Unfortunately, these days the majority of the problem calls come from India, and show as “unavailable” because the Indian call centers are using VoIP systems to place their calls to the UK, and they deliberately ensure that their callerid is “unavailable”. ![]() They’ll sell me a service to block “withheld” numbers, but not numbers that show as “unavailable”. They make money from all these calls, so its not in their interest to block them. The problem here is that the phone companies don’t care about this. The straw that broke the camels back was the call that came through at 6am on a Saturday morning. In addition (probably because of the modem constantly overheating) the software I was running kept crashing.īut recently we seem to have had a spate of annoying calls from direct marketeers based in India, selling products for UK companies that are cynically avoiding the UK’s regulations around direct marketing opt-outs. The concept was good, but I ran into problems with the modem it took up a lot of space, kept overheating, and lacked any voice facilities, limiting what I could do with it. ![]() My intention was to intercept calls from direct marketeers. Back in April last year I started playing with an old external serial-attached modem to read the callerid of incoming calls.
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