201-0a5c compatible with SIP/swiftel-syd-3ca8
  == Spawn extension (default, 88157022, 1) exited non-zero on 'SIP/201-0a5c'
    -- Executing Dial("SIP/201-0a5c", "SIP/swiftel-syd/h|10|r") in new stack
    -- Called swiftel-syd/h
    -- Got SIP response 404 "Not Found" back from 218.214.193.193
    -- SIP/swiftel-syd-853e is circuit-busy
  == Everyone is busy/congested at this time
    -- Executing Congestion("SIP/201-0a5c", "") in new stack
  == Spawn extension (default, h, 2) exited non-zero on 'SIP/201-0a5c'