flow:
  - start|sl:filtered-ack:
sip_in:
  - '^ACK sip:[% invite_outgoing_lock_scenarios_test.testuser1001.phone_number %]@invite-outgoing-lock.scenarios.test SIP/2.0'
  - 'From: <sip:[% scenarios.0.username %]@invite-outgoing-lock.scenarios.test>;tag=[\w-]+'
  - 'To: <sip:[% invite_outgoing_lock_scenarios_test.testuser1001.phone_number %]@invite-outgoing-lock.scenarios.test>;tag=[\w-]+'
  - 'CSeq: \d+ ACK'
  - 'Content-Length: 0'
sip_out: []
