Collapse AllExpand All

14.7.10. OpenScape Voice Loop detection Previous topic Parent topic Child topic Next topic

OpenScape Voice supports:
  • Setting and incrementing the Q.931 Transit Counter. This mechanism only provides protection for calls that loop within the enterprise network (e.g. with OpenScape 4000).
  • On OpenScape 4000 the COT parameter ATRS and the AMO TDCSU parameter TRACOUNT are used for configuration.
  • OpenScape Voice has a loop detection service that also protects against calls that loop through the public network. The service can be enabled with the parameters:
Srx/Service/CFLoopPrevention
Srx/Service/CFLoopMaxCount
  1. This service limits the number of concurrent unanswered trunk to trunk calls that have the same calling and called party number. The service applies to tandem calls (e.g. direct trunk to trunk routing) as well as diversion scenarios (e.g. trunk call is forwarded by a subscriber to a trunk). In case of diversion: the "diverted to" number is used.
  • The SIP Max-Forwads hop counter as per RFC 3261.
  • The scenario can be addressed with the Q.931 Transit counter configured on OpenScape 4000 or the loop detection service in OpenScape Voice.
${DocTitle}, ID: ${DocID}
© 03/2026 Mitel Networks Corporation. All rights reserved. Mitel and the Mitel logo are trademark(s) of Mitel Networks Corporation. Unify and associated marks are trademarks of Unify Software and Solutions GmbH & Co. KG. All other trademarks herein are the property of their respective owners.