My company is being harassed by telemarketers and I want to block those calls but this company calls from different numbers almost everytime which prevents me from using a ‘blacklist’. The only thing in common with all the calls is that a music ad is played as soon as the’re picked up.
So I thought about recording (at least) the start of the calls and compare it to a stored sample, if they’re the same, hangup, otherwise let the call flow.
Do you guys have any thought on this? Ever heard of somethihng similar or ever entirely different that I can use? keeping in mind I use both SIP an PRI trunking with the telco.