Cisco Unity Connection voicemail and migration

See also

Sources

1. 1
   From Unity Connection 15SU4, Microsoft Graph API is the only supported option for Office 365 unified messaging integration because EWS is being deprecated.

   Release Notes for Cisco Unity Connection Release 15 Service Update 4 · New and Changed Support or Functionality · Checked 2026-09-24
2. 2
   Unity Connection 15 Service Update 4 release notes were first published on June 8, 2026, and 15SU4 is version 15.0.1.14900-45.

   Release Notes for Cisco Unity Connection Release 15 Service Update 4 · Header; Version and Description · Checked 2026-09-24
3. 3
   The migration tool's export ZIP includes Auto-AttendantBulk.csv, which holds auto attendant provisioning data together with errors and notes for administrator review.

   Migrate devices and features from Unified CM to Webex Calling · Export ZIP file · Checked 2026-09-24
4. 4
   If a Webex Calling location cannot be derived from the Unity auto attendant number, the location must be set manually in the migration CSV.

   Migrate devices and features from Unified CM to Webex Calling · Auto-AttendantBulk.csv error table · Checked 2026-09-24
5. 5
   The migration tool can report that an auto attendant configuration cannot be migrated because Webex Calling has no equivalent feature.

   Migrate devices and features from Unified CM to Webex Calling · Auto-AttendantBulk.csv error table · Checked 2026-09-24
6. 6
   If the Unity auto attendant number is already assigned to another user in Webex Calling, the migration output flags it and the administrator must supply an available number, location, language and time zone manually.

   Migrate devices and features from Unified CM to Webex Calling · Auto-AttendantBulk.csv error table · Checked 2026-09-24
7. 7
   When the auto attendant number from Unity cannot be determined in Webex Calling, the administrator must manually fill the phone number, extension, location, language and time zone columns of Auto-AttendantBulk.csv.

   Migrate devices and features from Unified CM to Webex Calling · View Details on each CSV File, Auto-AttendantBulk.csv error table · Checked 2026-09-24
8. 8
   Cisco positions the built-in Webex Calling Auto Attendant as the destination for Unity Connection call handler and auto-attendant functionality, and names the Control Hub tool 'Migrate Features from Unified CM' as supporting migration of Unity Connection configurations to Webex Calling auto attendants.

   Prepare to migrate from Unified CM to Webex Calling · Cisco integrations: Unity Connection UCCX UCCE · Checked 2026-09-24
9. 9
   In the Control Hub Unified CM feature migration workflow, uploading a Unity Call Handler .zip file is an optional step used for Auto-Attendant migration.

   Migrate devices and features from Unified CM to Webex Calling · Migration of data, step 5 · Checked 2026-09-24
10. 10
    Unity Connection system call handlers answer calls and take messages, provide menus, route calls to users and other call handlers, and play audiotext.

    System Administration Guide for Cisco Unity Connection Release 15 - Call Management · System Call Handlers · Checked 2026-09-24
11. 11
    Cisco's feature migration article directs administrators to the CallHandlerDataDump tool to create the Unity call handler file that the migration tool ingests.

    Migrate devices and features from Unified CM to Webex Calling · Migration of data, step 5 (link to CallHandlerDataDump) · Checked 2026-09-24
12. 12
    CallHandlerDataDump requires the Informix ODBC drivers to be installed and runs as a Windows application (Win 7, Win 8, Win 10, 2008R2 listed).

    Call Handler Data Dump (download page) · Requirements / OS fields · Checked 2026-09-24
13. 13
    CallHandlerDataDump is marked as not supported by Cisco TAC.

    Call Handler Data Dump (download page) · Support field · Checked 2026-09-24
14. 14
    CallHandlerDataDump is at version 1.0.11 with a last update of 10/12/2020.

    Call Handler Data Dump (download page) · Version / Last Update fields · Checked 2026-09-24
15. 15
    Running CallHandlerDataDump against Unity Connection 12.x, 14 or 15 falls outside the versions its own page lists, even though Cisco's current Webex Calling migration article points to it.inferred

    Call Handler Data Dump (download page) · Supported versions field, read against cisco-help-d2lemv-migrate-devices-features-ucm Migration of data step 5 · Checked 2026-09-24
16. 16
    The CallHandlerDataDump tool page lists support for Unity Connection 7.x, 8.x, 9.x, 10.x and 11.x only.

    Call Handler Data Dump (download page) · Supported versions field · Checked 2026-09-24
17. 17
    COBRAS message extraction requires Unity Connection 7.0(2) or later; backups of 7.0(1) contain directory data only.

    COBRAS (download page) · Supported versions note · Checked 2026-09-24
18. 18
    A COBRAS backup and restore with messages carries directory data (users, call handlers, routing rules), greetings and messages, and large message stores must be split across multiple MDB files.

    Backup and Migration Strategies · COBRAS Backup and Restore with Messages · Checked 2026-09-24
19. 19
    The current COBRAS builds are Export 8.0.91 and Import 8.0.111, both dated 11/11/2025.

    COBRAS (download page) · Version fields · Checked 2026-09-24
20. 20
    COBRAS offers Briefcase mode for export and import and Hot Mode for Connection-to-Connection migration.

    COBRAS (download page) · Page overview, modes · Checked 2026-09-24
21. 21
    COBRAS stands for Cisco Unified Backup and Restore Application Suite and provides backup, restore and migration for Unity Connection.

    COBRAS (download page) · Page overview · Checked 2026-09-24
22. 22
    COBRAS is a Connection-to-Connection backup and migration tool and does not provide a path for importing messages into Webex Calling voicemail.inferred

    COBRAS (download page) · Whole page (no Webex or cloud target described), read with cisco-help-4yz2zd-prepare-migrate-ucm-wxc Cisco integrations section · Checked 2026-09-24
23. 23
    COBRAS is TAC supported, but use of the tools on unsupported Unity Connection versions is not.

    COBRAS (download page) · Support field · Checked 2026-09-24
24. 24
    COBRAS lists Unity Connection 7.x through 15.x as supported versions.

    COBRAS (download page) · Supported versions field · Checked 2026-09-24
25. 25
    In Dedicated Instance, Unity Connection is deployed at service activation and sized on the Knowledge Worker count given per region in the First Time Setup Wizard; Office 365 integration requires contacting support because it affects sizing.

    Introduction to Dedicated Instance · Cisco Unity Connection · Checked 2026-09-24
26. 26
    Webex Calling Dedicated Instance includes Cisco Unified Communications Manager and Cisco Unity Connection as core applications.

    Introduction to Dedicated Instance · Overview of UC applications · Checked 2026-09-24
27. 27
    A DRS restore of Unity Connection is monolithic: all existing data on the target system at the time of restore is lost.

    Backup and Migration Strategies · DRS backup and restore · Checked 2026-09-24
28. 28
    DRS cannot migrate between restricted and unrestricted Unity Connection installations.

    Backup and Migration Strategies · DRS backup and restore · Checked 2026-09-24
29. 29
    Unity Connection call handlers support seven greeting types: standard, closed, holiday, internal, busy, alternate and error.

    System Administration Guide for Cisco Unity Connection Release 15 - Call Management · System Call Handlers, greetings · Checked 2026-09-24
30. 30
    When a holiday is in effect, Unity Connection plays holiday greetings if enabled and applies closed-hours transfer rules.

    System Administration Guide for Cisco Unity Connection Release 15 - Call Management · Holiday Schedules · Checked 2026-09-24
31. 31
    Unity Connection interview handlers play a series of recorded questions and record the caller's answers.

    System Administration Guide for Cisco Unity Connection Release 15 - Call Management · Interview Handlers · Checked 2026-09-24
32. 32
    Unity Connection interview handlers have no direct counterpart among Webex Calling auto attendant key actions, so they are likely to need redesign rather than automatic migration.inferred

    System Administration Guide for Cisco Unity Connection Release 15 - Call Management · Interview Handlers, read against cisco-help-nsioxoi-webex-calling-auto-attendants key action list · Checked 2026-09-24
33. 33
    Webex Calling location design calls for provisioning one DID for the voicemail number alongside the main location number.

    Design to migrate from Unified CM to Webex Calling · Location setup (emergency calling and voicemail number) · Checked 2026-09-24
34. 34
    Message Shuttle moves messages only, extracts them only over secure IMAP, and works only on restricted Unity Connection installs.

    Backup and Migration Strategies · COBRAS Backup and Restore, Message Shuttle for Messages · Checked 2026-09-24
35. 35
    There is no native way to migrate existing Unity Connection voicemail messages or greetings into Webex Calling voicemail.

    Prepare to migrate from Unified CM to Webex Calling · Cisco integrations: Unity Connection UCCX UCCE · Checked 2026-09-24
36. 36
    As of 2026-09-24, Cisco's Unity Connection end-of-life notice listing contained no end-of-sale or end-of-life notice for version 15.

    Cisco Unity Connection - End-of-Life and End-of-Sale Notices · Notice list (newest entry 14/May/2025) · Checked 2026-09-24
37. 37
    Cisco states that some third-party partner migration tools can migrate some Unity Connection voicemail data, without naming the tools or the data covered.

    Prepare to migrate from Unified CM to Webex Calling · Cisco integrations: Unity Connection UCCX UCCE · Checked 2026-09-24
38. 38
    Perpetual licensing for Unity Connection (8.x to 12.x software, user licenses and upgrade SKUs) reached end of sale on January 23, 2021 and last date of support on January 31, 2024.

    End-of-Sale and End-of-Life Announcement for Perpetual Licensing for Cisco Unity Connection · Table 1 · Checked 2026-09-24
39. 39
    The Control Hub feature migration tool covers Auto-Attendant, Devices, Configured Lines, Device Layout (speed dial, shared line), Virtual Line, Call Queue, Hunt Group, Call Park and User Calling data (call forwarding and call monitoring); voicemail messages are not in that list.

    Migrate devices and features from Unified CM to Webex Calling · Overview (supported features list) · Checked 2026-09-24
40. 40
    Each Unity Connection call handler has three transfer rules: standard (standard hours), closed (nonbusiness and holiday hours) and alternate, which when enabled overrides the other two at all times.

    System Administration Guide for Cisco Unity Connection Release 15 - Call Management · System Call Handlers, transfer rules · Checked 2026-09-24
41. 41
    The Unity call handler .zip uploaded to the Control Hub feature migration tool may be at most 2 GB.

    Migrate devices and features from Unified CM to Webex Calling · Migration of data, step 5 · Checked 2026-09-24
42. 42
    Version 14 on-premises calling applications, including Unity Connection 14, reached end of sale for perpetual licensing on April 7, 2025.

    End-of-Sale and End-of-Life Announcement for the Cisco Version 14 of On-premises Calling applications (including Cisco Unified Communications Manager) — Perpetual · Table 1, End-of-Sale Date · Checked 2026-09-24
43. 43
    The last date of support for version 14 perpetual on-premises calling applications, including Unity Connection 14, is April 30, 2027.

    End-of-Sale and End-of-Life Announcement for the Cisco Version 14 of On-premises Calling applications (including Cisco Unified Communications Manager) — Perpetual · Table 1, Last Date of Support · Checked 2026-09-24
44. 44
    Cisco's version 14 end-of-life notice encourages customers to move to the latest on-premises calling release or to cloud calling under Collaboration Flex Plan 3.0.

    End-of-Sale and End-of-Life Announcement for the Cisco Version 14 of On-premises Calling applications (including Cisco Unified Communications Manager) — Perpetual · Product Migration Options · Checked 2026-09-24
45. 45
    As of 2026-09-24, Unity Connection 14 on perpetual licensing gets no further software maintenance releases and has about seven months of support left.inferred

    End-of-Sale and End-of-Life Announcement for the Cisco Version 14 of On-premises Calling applications (including Cisco Unified Communications Manager) — Perpetual · Table 1, compared with access date · Checked 2026-09-24
46. 46
    End of software maintenance releases for version 14 perpetual on-premises calling applications, including Unity Connection 14, was April 7, 2026.

    End-of-Sale and End-of-Life Announcement for the Cisco Version 14 of On-premises Calling applications (including Cisco Unified Communications Manager) — Perpetual · Table 1, End of SW Maintenance Releases Date · Checked 2026-09-24
47. 47
    Cisco Unity Connection version 15 was released on October 16, 2023 and was listed as available for order.

    Cisco Unity Connection Version 15 · Series overview: Release Date, Status · Checked 2026-09-24
48. 48
    For Webex App visual voicemail with Unified CM, Unity Connection and Unified CM must use a matching authentication method (legacy SSO, OAuth SSO or non-SSO), and Cisco recommends matching Unity Connection and Unified CM versions.

    Deployment guide for Calling in Webex App (Unified CM) · Voicemail prerequisites / Unity Connection requirements · Checked 2026-09-24
49. 49
    Cisco advises against using visual voicemail in Jabber and Webex App at the same time because of server performance.

    Deployment guide for Calling in Webex App (Unified CM) · Voicemail configuration notes · Checked 2026-09-24
50. 50
    When Webex App calls through on-premises Unified CM, its visual voicemail inbox comes from Unity Connection, where users can play, delete, mark read and call back messages.

    Deployment guide for Calling in Webex App (Unified CM) · Voicemail feature description · Checked 2026-09-24
51. 51
    Custom Webex Calling auto attendant greetings must be WAV files at 8 or 16 kHz, 8 or 16 bit mono, u-law, A-law or PCM, with a maximum size of 2 MB (about 4 minutes).

    Manage auto attendants · Greeting upload requirements · Checked 2026-09-24
52. 52
    Webex Calling auto attendant menu keys (0-9, *, #) can play an announcement, transfer with or without prompt, transfer to operator, transfer to voicemail, dial by name, dial by extension, or exit the menu.

    Manage auto attendants · Business hours / after hours menu key options · Checked 2026-09-24
53. 53
    Webex Calling cannot integrate with a premises voicemail system such as Unity Connection or Unity Connection Express.

    Prepare to migrate from Unified CM to Webex Calling · Cisco integrations: Unity Connection UCCX UCCE · Checked 2026-09-24
54. 54
    Webex Calling supports shared voicemail and fax mailboxes.

    Prepare to migrate from Unified CM to Webex Calling · Cisco integrations: Unity Connection UCCX UCCE · Checked 2026-09-24
55. 55
    A Webex Calling user's custom voicemail greeting can be uploaded as a WAV file or recorded.

    Configure and manage voicemail settings for a Webex Calling user · Configure additional voicemail settings for a user · Checked 2026-09-24
56. 56
    Webex Calling voicemail PINs must be between 6 and 30 digits and must not contain repeated patterns.

    Configure and manage voicemail settings for a Webex Calling user · Reset/Set a temporary voicemail PIN for a user · Checked 2026-09-24
57. 57
    Webex Calling voicemail allows a single message of up to 10 minutes and a total mailbox of 100 minutes.

    Configure and manage voicemail settings for a Webex Calling user · Manage a user's voicemail message storage · Checked 2026-09-24
58. 58
    Voicemail is built natively into the Webex Calling offer.

    Prepare to migrate from Unified CM to Webex Calling · Cisco integrations: Unity Connection UCCX UCCE · Checked 2026-09-24
59. 59
    An optional Cisco Unity Connection export produced by the CallHandlerDataDump tool may be uploaded as a .zip file up to 2 GB.

    Migrate devices and features from Unified CM to Webex Calling · Import data, Unity upload step · Checked 2026-09-04

Documents

Cite this page

WarmTransfer. (2026, September 24). Cisco Unity Connection voicemail and migration. WarmTransfer. https://warmtransfer.net/knowledge/cucm-unity-connection

@misc{warmtransfer-cucm-unity-connection,
  title  = {Cisco Unity Connection voicemail and migration},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/cucm-unity-connection},
  note   = {Verified 2026-09-24}
}