/mcp© 2018 Cisco Systems, Inc. All rights reserved. Important notices, privacy statements, and trademarks of Cisco Systems, Inc. can be found on cisco.com Page 7 of 48 Caveats Caller ID is not updated on attended and unattended transfer scenarios. Only one IP PBX used for the testing. The Cisco UBE HA tested is layer 2 box to box Cisco UBE redundancy. Transcoder has been enabled on Cisco UBE to support Inband DTMF.