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So I know this is a fairly simple question, but I can't seem to find a good answer to it. I have a DID which is getting hit fairly hard (or at least for me, about 1-3 calls per day) with telemarketers from non 1-8XX numbers. However there are only a handful of numbers that call day in and day out. So naturally I would just like to block them so my phone doesn't ring and I don't get billed for a call.

I'm looking to send a SIP/404 or some other non-answer response-- not send them to voicemail or another recording. I don't really care about logging or anything like that, I just would like to be able to add (or remove) a number fairly easily so I can cut down on unnecessary calls.

Everything I find seems to be either too complex or too simple (only one blocked number) and I can't find a good medium. Hopefully someone else will have better insight! I am using Asterisk 1.6. Thank you!

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Take a look at this: stackoverflow.com/questions/3624458/… –  kaptk2 Jan 13 '12 at 21:17

2 Answers 2

up vote 1 down vote accepted

I've done something similar and like the other submitter, I used a database. Instead of using the built int DB functionality, I used cmd MySQL. This was so I could write a web page that interacts with the same DB AND my DBA could do cross DB selects between this "Directory" table and the MySQL CDR.

In my example, I setup a table with 4 fields. id (auto_increment int), number (the phone number), name (The name of user), ban (an int that defaults to 0). The example does 2 things, 1- it looks up name from the DB and sets that as the caller id (Since our POTS line doesn't communicate that) 2- It looks up to see if ban is set to 1, and blocks the call.

exten => s,1,Answer
exten => s,n,NoOp("Caller ID IS: ${CALLERID(number)}")
exten => s,n,MYSQL(Connect connid HOST USER PASSWORD database)
exten => s,n,MYSQL(Query resultid ${connid} SELECT name,ban FROM directory WHERE number='${CALLERID(number)}')
exten => s,n,MYSQL(Fetch fetchid ${resultid} name ban)
exten => s,n,NoOp("We found: ${name} ${ban}")
exten => s,n,MYSQL(Clear ${resultid})
exten => s,n,MYSQL(Disconnect ${connid});
exten => s,n,Set(CALLERID(name)=${name})
exten => s,10,NoOp()
exten => s,n,GotoIf($["${ban}" = "1"]?wedontlikeyou,s,1)
exten => s,n,Goto(mainmenu,s,1)

After this you'd have your [mainmenu] and [wedontlikeyou]. The later is your ban, it could be a simple hangup, error message, what ever you want. My preference is Congestion() since that tends to make people think the phone number is out of service.

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How are your programming skills? I'm not sure about all the details, but I guess from your question:

  • You have a US incoming number delivered to you via SIP protocol
  • This is a number you pay incoming call costs for (1-800 ?)
  • You have a number of caller-id numbers you want to block
  • This number is big enough (more than 10, I guess) to not write one or two lines of code in extensions.conf for each number

Have a look at the code in the link kaptk2 mentioned.

And then have a look at the DB() functions of asterisk: Asterisk function DB(). You would do a lookup of each incoming caller-id as database key and you can maintain database keys from the asterisk commandline.

Short example of DB management:

greenblatt*CLI> database put blockcaller 18005551212 1
Updated database successfully
greenblatt*CLI> database get blockcaller 18005551212
Value: 1

You could access the value with something like:

exten => s,1,GotoIf($[${DB(blockcaller/${CALLERID(num)}))} = 1]?blocked:ok

The best way to 'kill' the call would be to use the Hangup() function. Or if you insist on a 404 code: send it to a non-existing extension.

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