[speeddial]
exten => 300,1,dial(SIP/15555555555@sip.broadvoice.com,30) 
exten => 301,1,dial(SIP/15555555556@sip.broadvoice.com,30)
exten => _30X,2,congestion() ; No answer, nothing
exten => _30X,102,busy() ; Busy