Leave voicemail without ringing the phone.
Must be able to use any Hosted Multi Channel SIP provider.
Must be multi threaded
You must have previous experience on ringless voicemail drop!
Here is exact program flow
program will launch threads
load numbers from a txt file
load multichannel and multiple sip accounts
then starts to place calls two at a time
call one times out 1 sec
call two placed at same time goes to voicemail
call two leaves a prerecorded voicemail and hangs up