1: 2: 3: 4: 5: 6: 7: 8:
[BLF_Group_1] exten => 603,hint,SIP/603 exten => 605,hint,SIP/605 exten => 500,hint,iax2/asei/500 exten => 501,hint,iax2/asei/501 exten => 502,hint,iax2/asei/502 exten => 503,hint,iax2/asei/503 exten => 504,hint,iax2/asei/504