Per the COBRAS help file, the following note appears:
Phone passwords (PINs) from Unity 7.0, Connection 7.0 and Connection 1.2 backups will NOT be restored when importing those users into Connection 7.0 systems. This has to do with a missing functionality in the credentials management system in the 7.0 releases. This will be addressed in the 7.1(3) release of Connection at which point COBRAS will take advantage of it and provide PIN support for all three versions.
Can someone confirm that this functionality works as stated in 7.1.3?