[brf-ivr]
exten => 2520,1,Answer
exten => 2520,2,DigitTimeout,5
exten => 2520,3,ResponseTimeout,10
exten => 2520,4,Background(brf-welcome)

exten => 101,1,Dial(SIP/brf101|15|t)
exten => 102,1,Dial(SIP/brf102|15|t)
exten => 103,1,Dial(SIP/brf103|15|t)
exten => 104,1,Dial(SIP/brf104|15|t)
exten => 105,1,Dial(SIP/brf105|15|t)
exten => 106,1,Dial(SIP/brf106|15|t)

exten => t,1,Dial(SIP/brf101&SIP/brf102&SIP/brf103&SIP/brf104&SIP/brf105&SIP/brf106|15|t)
exten => #,1,Playback(brf-goodbye)