flow:
  - start|DEFAULT_ONREPLY:
  - start|REPLY_ROUTE_NAT:
  - start|ROUTE_ENTRY:
  - return|ROUTE_ENTRY:
  - start|ROUTE_APPLY_HEADER_RULES:
  - return|ROUTE_APPLY_HEADER_RULES:
  - start|ROUTE_PREPARE_UA:
  - return|ROUTE_PREPARE_UA:
  - start|REPLY_ROUTE_RTPENGINE:
  - return|REPLY_ROUTE_RTPENGINE:
  - start|REPLY_ROUTE_NAT_CONTINUE:
  - start|ROUTE_EXIT:
  - start|ROUTE_RUNTIME:
  - return|ROUTE_RUNTIME:
  - exit|ROUTE_EXIT:
sip_in:
  - 'SIP/2.0 180 Ringing'
  - 'Content-Type: application/sdp'
  - 'Content-Length:\s+\d+'
sip_out:
  - [
      'SIP/2.0 180 Ringing',
      'Content-Type: application/sdp',
      'Content-Length:\s+\d+',
      'P-Early-Media: sendrecv',
    ]
