-- Starting simple switch on 'Zap/2-1'
  == Starting Zap/2-1 at DID_trunk_3,s,1 failed so falling back to exten 's'
  == Starting Zap/2-1 at DID_trunk_3,s,1 still failed so falling back to context 'default'
[Apr 12 16:46:17] WARNING[4774]: pbx.c:2432 __ast_pbx_run: Channel 'Zap/2-1' sent into invalid extension 's' in context 'default', but no invalid handler
    -- Hungup 'Zap/2-1'