https://sourceforge.net/p/jcblock/news/2010-05-26T14:43:05ZRecent posts to news2010-05-26T14:43:05Z2010-05-26T14:43:05ZWalterhttps://sourceforge.net/u/sabercat/https://sourceforge.net7922e21626e91463c861c0d93089cb5ade18f7cf

<div class="markdown_content"><p>A program to block telemarketing (junk) calls. The program uses a modem to collect the caller ID data received between the first and second rings of a call, and then stores it in a caller ID file. It then scans records in a blacklist file against the caller ID data. If a match is found, it sends off-hook/on-hook commands to the modem, which terminates the call.</p> <p>The program runs on a standard PC that has a serial port to access the modem. If a PC does not have a serial port, an inexpensive PCI serial port card may be installed. For continuous operation a better solution is to run it on a low power embedded system similar to the one shown in the project's screenshots.</p> <p>Release 2.0 includes additional features: 1) a whitelist file for calls you definitely want to accept, 2) a facility for automatically placing a call record in the blacklist by pressing key '5' on a touchtone phone handset, 3) a set of functions that truncate entries in the blacklist file that have not been used to terminate a call in the past year and to truncate caller ID file records that are older than a year. The latter two features may be optionally disabled.</p> <p>After running the program for about six months (and building up the blacklist), only a few junk calls are received in a week, as telemarketers remove the called number from their call lists. More detailed information is available in the project's README file.</p></div>