[sippeer]
exten => 8456944553,1,Background(call)
exten => 8456944553,n,Dial(SIP/0573,20,tm)
exten => 11,1,Dial(SIP/0573,20,tm)
exten => 22,1,Dial(H323/0123,20,tm)
exten => 33,1,Dial(SIP/2727,20,tm)
exten => 44,1,MusicOnHold,default

[testing]
exten => 3333,1,Background(call)
exten => 3333,n,Dial(SIP/0573,20,tm)
exten => 11,1,Dial(SIP/0573,20,tm)
exten => 22,1,Dial(H323/0123,20,tm)
exten => 33,1,Dial(SIP/2727,20,tm)
exten => 44,1,MusicOnHold,default