Voice Call - Release Call

The Release Call tests for a INAP ReleaseCall operation which will release the A party (and if connected, the B party), ending the call.

Test Fields

Release Cause


The Release Cause value in the release call is part of the encoded ISUP Cause field.

It is the most often specified part of the release call message, usually set to 31.


  • 3 No route to destination
  • 16 Normal call clearing
  • 21 Call rejected
  • 31 Normal release