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Unified CM dial plan partitions and calling search spaces

Verified 2026-09-24 · 59 sources · tier 2

Unified CM partitions divide the route plan into logical subsets based on accessibility requirements, organization, location, and call type 30. Calling search spaces (CSSs) act as ordered lists of these route partitions 10.

Partition and CSS Structure

In Unified CM 15, a partition is a logical group that can contain route patterns, directory numbers, translation patterns, transformation patterns, URIs, and hunt pilots 25. Partition names can contain alphanumeric characters, spaces, hyphens, and underscores 28. Partitions are configured in Cisco Unified CM Administration under Call Routing > Class of Control > Partition 27. A Unified CM 15 partition can also carry an optional time schedule that specifies when the partition is available to receive incoming calls, with the time zone originating from the device or a specifically configured zone 31.

A calling search space consists of an ordered list of route partitions 10. A CSS name can be up to 50 characters and may contain alphanumerics, spaces, periods, hyphens, and underscores 13. In Unified CM 15, the partition configuration task flow requires configuring partitions in step 1 before configuring calling search spaces in step 2 36.

In releases through 11.0, any device making a call can reach any Unified CM dial plan entry left in the <None> partition, regardless of its assigned CSS 23. Cisco recommends not leaving dial plan entries in the <None> partition to avoid unexpected results 24.

Partition Limits and Character Constraints

In Unified CM 15, the list of partitions inside a calling search space is limited to 1024 characters, meaning the maximum number of partitions depends directly on partition name lengths 11.

Maximum Partitions Partition Name Length Supported Release
170 2 characters CallManager 4.1(3) 26
32 15 characters CallManager 4.1(3) 26
92 10 characters Unified CM 15 14
64 15 characters Unified CM 15 14

In CallManager 4.0(1), an individual CSS was limited to 512 characters, which was half of the 1024-character limit on the combined device and line CSS clause 12.

Concatenation and Digit Analysis

When a calling search space is assigned to both a caller's phone and directory number, Unified CM 15 concatenates the two to create the caller's effective CSS 9. In CallManager 4.0(1), the two are concatenated with the line CSS placed ahead of the device CSS 18. For an IP phone on Unified CM 11.0, where both device and line carry a CSS, the line CSS takes precedence over the device CSS 19. In Unified CM 12.5(1), a call from a line whose CSS differs from its phone's CSS searches the partitions of both calling search spaces 20.

In CallManager 4.0(1), digit analysis searches every partition in the calling search space for the best match 2. The order of partitions in a CSS only breaks ties between equally good matches across different partitions 29. In Unified CM 12.5(1), when two patterns match dialed digits equally well, digit analysis selects the pattern whose partition is listed first in the CSS 37. WarmTransfer's reading of the sources is that because Cisco documentation from 4.0(1) and 12.5(1) consistently states that partition order only breaks ties between equally specific matches, the same closest-match behavior very likely applies in Unified CM 15 5.

Routing Logic and Pattern Transformations

Unified CM routes off-net calls through route patterns, which point to route lists, which contain route groups that distribute calls to gateways and trunks 34. Local route groups let off-net calls use the gateway defined by the calling device's device pool instead of the gateway configured on the route pattern 21. In Unified CM 15, each route pattern must have a unique combination of partition, route filter, and numbering plan 35. In route patterns, the @ wildcard matches all numbers recognized by the national numbering plan (for example, 9.@ routes or blocks all such numbers) 1. Route filters are mandatory when a route pattern is based on a numbering plan installed via a dial plan installer file 33.

When a translation pattern matches, Unified CM applies the translation and routes the call again using the CSS configured directly on that translation pattern 40. Transformation patterns are assigned to a partition and take effect through calling search spaces containing that partition 38.

The Unified CM 15 call routing task flow requires configuring translation patterns and calling/called party transformation patterns first, followed by optional local route groups, route groups, route lists, and route filters, then route patterns, and finally optional AAR and time-of-day routing 3.

Webex Calling Coexistence and Migration

For Unified CM and Webex Calling coexistence, Cisco states a dedicated Webex Calling partition on Unified CM is required to establish a differentiated class of service for calls originating from Webex Calling 53. To avoid call loops, the inbound CSS on the Unified CM trunk from the Local Gateway should not have access to this Webex Calling partition 17. The Webex partition must be added to the inbound CSS on Unified CM PSTN trunks so PSTN calls to Webex Calling numbers can route 32. Cisco's coexistence design also uses translation pattern CSS inheritance ("Use Originator's Calling Search Space") to support dialing normalization patterns 39.

Cisco lists several coexistence dial plan requirements for Unified CM, including +E.164, extension and abbreviated inter-site dialing to Webex Calling, forced on-net dialing in both directions, call-back from missed-call directories, and PSTN routing based on the chosen PSTN strategy 6. Cisco's configuration includes:

  • Adding a route pattern for each DID range hosted on Webex Calling using the full +E.164 pattern with a leading backslash and pointing to the RL_Webex route list 42.
  • Assigning the Unified CM SIP trunk to Webex (via the Local Gateway) an AAR CSS reaching only PSTN reroute patterns (PSTNReroute) 43.

Webex Calling internal extension lengths can range from 2 to 10 digits (defaulting to 4) 50. Location routing prefix lengths span 1 to 7 digits and include the steering digit (a length of 4 leaves 3 digits for the site code) 57. When extensions overlap between locations, Cisco instructs administrators to build an enterprise numbering plan by prefixing extensions with an access code and site code 49. Cisco design guidance also specifies setting the maximum unknown extension length in Webex Calling so calls from on-premises call control into Webex Calling are classified properly 52.

The Webex Calling "Allow extension dialing between locations" toggle is enabled by default and works if extensions do not duplicate across locations; when disabled, extension calls route to matching extensions in the caller's own location 51. When a location enables routing of unknown extensions, calls to unknown 2-10 digit extensions route to the selected trunk or route group as premises calls 58.

Webex Calling dial plans route calls to on-premises destinations over trunks or route groups, are configured for the entire enterprise, and apply to all users regardless of location 46. Dial patterns in Webex Calling only allow X (one digit) and ! (any digit sequence, E.164 only, once at the end); X cannot appear mid-number or combine with ! 45.

Outgoing call permissions in Webex Calling can be configured for locations, users, workspaces, and virtual lines 55. Permissions can allow or block internal, toll-free, national, international, operator assistance, chargeable directory assistance, special services I and II, and premium services I and II call types 44. For each call type or digit pattern, administrators can choose Allow, Block, Require Authorization Code, or Auto-transfer to number 1, 2, or 3, and can separately control call transfers and forwards 54. Webex Calling permits up to 500 outgoing-permission digit patterns per location, user, workspace, or virtual line 47. Custom digit patterns on a user, workspace, or virtual line apply first, falling back to location settings if none match, and digit patterns take precedence over permissions by call type 48.

WarmTransfer's reading of the sources is that Unified CM class of service built from tiered CSSs corresponds most closely to Webex Calling outgoing call permissions by call type and digit pattern rather than Webex Calling dial plans 7. Furthermore, we infer that because Webex Calling dial plans are enterprise-wide, per-device or per-line routing differences expressed in Unified CM with different CSSs cannot be reproduced through Webex Calling dial plans alone 22.

See also

Applicability

Applies to: Cisco Unified Communications Manager, Cisco CallManager, Cisco Unified Communications Manager with Webex Calling, Cisco Webex Calling, and Cisco Unified Communications Manager; Webex Calling. Deployments: on-premises, hybrid, and multi-tenant. Sources checked 2026-09-24. Specific documented releases include CallManager 4.0(1) 12, CallManager 4.1(3) 26, Unified CM 11.0 19, Unified CM 12.5(1) 37, and Unified CM 15 25.

What remains uncertain

How the Cisco Transitioning from Unified CM to Webex Calling deployment guide maps CSS and partition class of service to Webex Calling is not covered by the sources below. The documented Webex Calling routing order between internal numbers, enterprise dial plans, unknown-extension routing, and the PSTN is not covered by the sources below. Whether the UCM-to-Webex Calling migration tool reads or converts CSSs, partitions, and translation patterns is not covered by the sources below. A current Release 15 Cisco document stating closest-match behavior and the partition-order tie-breaker is not covered by the sources below. Whether Webex Calling Dedicated Instance keeps the full Unified CM partition and CSS model is not covered by the sources below. Mapping Unified CM local route groups and device-pool gateway selection to Webex Calling location PSTN connections is not covered by the sources below. Mapping Unified CM time-of-day partitions to Webex Calling schedules or operating modes is not covered by the sources below. A current-release statement that the line CSS is placed ahead of the device CSS is not covered by the sources below.

See also

Related to

  • Unified CM device pools and device configuration model — Local route groups let off-net calls use the gateway set by the device pool instead of the route pattern (CUCM 15 System Configuration Guide; Configure Call Routing). The topic id comes from a sibling research directory name. The relationship has not been checked against the topic registry.

Referenced by

Sources

  1. 1
    In Unified CM route patterns the @ wildcard matches all numbers the national numbering plan recognizes. For example, 9.@ routes or blocks all such numbers.
    System Configuration Guide for Cisco Unified Communications Manager Release 15 and SUs - Configure Call Routing · Configure Call Routing > Wildcards and Special Characters in Route Patterns · Checked 2026-09-24
  2. 2
    In CallManager 4.0(1), digit analysis searches every partition in the calling search space for the best match.
    Cisco CallManager System Guide, Release 4.0(1) - Partitions and Calling Search Spaces · Partitions and Calling Search Spaces > Understanding Partitions and Calling Search Spaces · Checked 2026-09-24
  3. 3
    The Unified CM 15 call routing task flow configures translation patterns and calling and called party transformation patterns first, then optional local route groups, route groups, route lists and route filters, then route patterns, and then optional AAR and time-of-day routing.
    System Configuration Guide for Cisco Unified Communications Manager Release 15 and SUs - Configure Call Routing · Configure Call Routing > Call Routing Configuration Task Flow · Checked 2026-09-24
  4. 4
    The Unified CM 15 guide shows class of service built with tiered CSSs (Base_CSS, LocalPSTN_CSS, NationalPSTN_CSS, InternationalPSTN_CSS), where each tier adds a partition (PSTN_Local_PT, PSTN_National_PT, PSTN_Intl_PT) to the lower tiers' partitions.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Class of Service (example table) · Checked 2026-09-24
  5. 5
    Cisco documentation from 4.0(1) and 12.5(1) consistently says partition order only breaks ties between equally specific matches, so the same closest-match behaviour very likely applies in Unified CM 15. This run found no Release 15 document that states it.inferred
    Troubleshooting Guide for Cisco Unified Communications Manager, Release 12.5(1) - Dial Plans and Routing Issues · Dial Plans and Routing Issues > Route Partitions and Calling Search Spaces · Checked 2026-09-24
  6. 6
    Cisco lists coexistence dial plan requirements for Unified CM. They include +E.164, extension and abbreviated inter-site dialing to Webex Calling, forced on-net dialing in both directions, call-back from missed-call directories, and PSTN routing that depends on the PSTN strategy.
    Design to migrate from Unified CM to Webex Calling · On-premises dial plan in Unified CM (list of requirements) · Checked 2026-09-24
  7. 7
    Unified CM class of service built from tiered CSSs (local, national, international) corresponds most closely to Webex Calling outgoing call permissions by call type and digit pattern, not to Webex Calling dial plans.inferred
    Outgoing call permissions for Webex Calling locations · Call types and digit patterns sections, read against cisco-cucm-sysconfig-15-partitions Class of Service · Checked 2026-09-24
  8. 8
    Unified CM calling search spaces can be assigned to directory numbers and to devices such as phones and gateways.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Calling Search Space Overview · Checked 2026-09-24
  9. 9
    When a calling search space is assigned to both a caller's phone and the caller's directory number, Unified CM 15 concatenates the two to form the caller's effective CSS.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Calling Search Space Overview · Checked 2026-09-24
  10. 10
    A Unified CM calling search space (CSS) is an ordered list of route partitions.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Calling Search Space Overview · Checked 2026-09-24
  11. 11
    In Unified CM 15 the list of partitions in a calling search space is limited to 1024 characters, so the maximum number of partitions in a CSS depends on partition name length.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Partition Name Guidelines · Checked 2026-09-24
  12. 12
    In CallManager 4.0(1) an individual CSS was limited to 512 characters, half of the 1024-character limit on the combined device and line CSS clause.
    Cisco CallManager System Guide, Release 4.0(1) - Partitions and Calling Search Spaces · Partitions and Calling Search Spaces > Partition Name Limitations · Checked 2026-09-24
  13. 13
    A Unified CM 15 calling search space name can be up to 50 characters and may contain alphanumerics, spaces, periods, hyphens and underscores.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Configure Calling Search Spaces procedure, Step 3 · Checked 2026-09-24
  14. 14
    The Unified CM 15 guide says a CSS can hold at most 92 partitions with 10-character names and 64 partitions with 15-character names.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Partition Name Guidelines (partition-count table) · Checked 2026-09-24
  15. 15
    In Unified CM a caller can reach a destination only if the destination sits in a partition included in the caller's calling search space.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Calling Search Space Overview · Checked 2026-09-24
  16. 16
    The Unified CM 12.5(1) troubleshooting guide advises that callers may need to wait at least 10 seconds after the last digit for the interdigit timer to expire when overlapping patterns exist.
    Troubleshooting Guide for Cisco Unified Communications Manager, Release 12.5(1) - Dial Plans and Routing Issues · Dial Plans and Routing Issues > Dial Plan Issues · Checked 2026-09-24
  17. 17
    To avoid call loops, the inbound CSS on the Unified CM trunk from the Local Gateway should not have access to the Webex Calling partition.
    Design to migrate from Unified CM to Webex Calling · On-premises dial plan in Unified CM · Checked 2026-09-24
  18. 18
    In CallManager 4.0(1), when a line and its device both have a CSS, the two are concatenated with the line CSS placed ahead of the device CSS.
    Cisco CallManager System Guide, Release 4.0(1) - Partitions and Calling Search Spaces · Partitions and Calling Search Spaces > Understanding Partitions and Calling Search Spaces · Checked 2026-09-24
  19. 19
    For an IP phone on Unified CM 11.0, where both device and line carry a CSS, the line CSS takes precedence over the device CSS.
    Configure Partition and Calling Search Space · Background Information · Checked 2026-09-24
  20. 20
    In Unified CM 12.5(1), a call from a line whose CSS differs from its phone's CSS searches the partitions of both calling search spaces.
    Troubleshooting Guide for Cisco Unified Communications Manager, Release 12.5(1) - Dial Plans and Routing Issues · Dial Plans and Routing Issues > Route Partitions and Calling Search Spaces (AccessLevelX/AccessLevelY example) · Checked 2026-09-24
  21. 21
    Unified CM local route groups let off-net calls use the gateway set by the calling device's device pool instead of the one set in the route pattern.
    System Configuration Guide for Cisco Unified Communications Manager Release 15 and SUs - Configure Call Routing · Configure Call Routing > Configure Local Route Groups · Checked 2026-09-24
  22. 22
    Because Webex Calling dial plans are enterprise-wide, per-device or per-line routing differences that Unified CM expresses with different CSSs (for example site-specific gateways) cannot be reproduced through Webex Calling dial plans alone.inferred
    Configure trunks, route groups, and dial plans for Webex Calling · Dial plans section (enterprise-wide scope), read against cisco-cucm-sysconfig-15-partitions CSS overview · Checked 2026-09-24
  23. 23
    Any device making a call can reach any Unified CM dial plan entry left in the <None> partition, regardless of its calling search space.
    Configure Partition and Calling Search Space · Background Information · Checked 2026-09-24
  24. 24
    Cisco recommends not leaving Unified CM dial plan entries in the <None> partition, to avoid unexpected results.
    Configure Partition and Calling Search Space · Background Information · Checked 2026-09-24
  25. 25
    In Unified CM 15 a partition is a logical group that can contain route patterns, directory numbers, translation patterns, transformation patterns, URIs and hunt pilots.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Partitions Overview · Checked 2026-09-24
  26. 26
    The CallManager 4.1(3) administration guide allowed a CSS 32 partitions with 15-character names and 170 partitions with 2-character names.
    Cisco CallManager Administration Guide, Release 4.1(3) - Calling Search Space Configuration · Calling Search Space Configuration > Partition Limitations table · Checked 2026-09-24
  27. 27
    Partitions are configured in Cisco Unified CM Administration under Call Routing > Class of Control > Partition.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Configure Partitions procedure, Step 1 · Checked 2026-09-24
  28. 28
    Unified CM 15 partition names can contain alphanumeric characters, spaces, hyphens and underscores.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Configure Partitions procedure, Step 3 · Checked 2026-09-24
  29. 29
    In CallManager 4.0(1), the order of partitions in a calling search space only breaks ties between equally good matches in different partitions.
    Cisco CallManager System Guide, Release 4.0(1) - Partitions and Calling Search Spaces · Partitions and Calling Search Spaces > Understanding Partitions and Calling Search Spaces · Checked 2026-09-24
  30. 30
    Unified CM partitions divide the route plan into logical subsets based on accessibility requirements, organization, location and call type.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Partitions Overview · Checked 2026-09-24
  31. 31
    A Unified CM 15 partition can carry an optional time schedule that specifies when the partition is available to receive incoming calls. The time zone comes from the originating device or from a specific time zone.
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Configure Partitions procedure (Time Schedule and Time Zone fields) · Checked 2026-09-24
  32. 32
    The Webex partition must be added to the calling search space used as the inbound CSS on Unified CM PSTN trunks so that PSTN calls to Webex Calling numbers can be routed.
    Configure Unified CM for Webex Calling · Partitions / Calling search spaces section · Checked 2026-09-24
  33. 33
    Unified CM route filters are mandatory when a route pattern is based on a numbering plan installed with a dial plan installer file.
    System Configuration Guide for Cisco Unified Communications Manager Release 15 and SUs - Configure Call Routing · Configure Call Routing > Route Filter overview · Checked 2026-09-24
  34. 34
    Unified CM routes off-net calls through route patterns, which point to route lists, which contain route groups, which distribute calls to gateways and trunks.
    System Configuration Guide for Cisco Unified Communications Manager Release 15 and SUs - Configure Call Routing · Configure Call Routing > Call Routing Overview (route plan hierarchy) · Checked 2026-09-24
  35. 35
    In Unified CM 15 each route pattern must have a unique combination of partition, route filter and numbering plan.
    System Configuration Guide for Cisco Unified Communications Manager Release 15 and SUs - Configure Call Routing · Configure Call Routing > Configure Route Patterns procedure · Checked 2026-09-24
  36. 36
    The Unified CM 15 partition configuration task flow configures partitions (step 1) before calling search spaces (step 2).
    System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions · Configure Partitions > Partition Configuration Task Flow · Checked 2026-09-24
  37. 37
    In Unified CM 12.5(1), when two patterns match the dialed digits equally well, digit analysis chooses the pattern whose partition is listed first in the calling search space.
    Troubleshooting Guide for Cisco Unified Communications Manager, Release 12.5(1) - Dial Plans and Routing Issues · Dial Plans and Routing Issues > Route Partitions and Calling Search Spaces · Checked 2026-09-24
  38. 38
    Unified CM transformation patterns are assigned to a partition, and so take effect through calling search spaces that contain that partition.
    System Configuration Guide for Cisco Unified Communications Manager Release 15 and SUs - Configure Call Routing · Configure Call Routing > Transformation Patterns overview · Checked 2026-09-24
  39. 39
    Cisco's coexistence design uses translation pattern CSS inheritance ('Use Originator's Calling Search Space') to support dialing normalization patterns.
    Design to migrate from Unified CM to Webex Calling · On-premises dial plan in Unified CM · Checked 2026-09-24
  40. 40
    When a Unified CM translation pattern matches, Unified CM applies the translation and routes the call again using the calling search space configured on the translation pattern.
    System Configuration Guide for Cisco Unified Communications Manager Release 15 and SUs - Configure Call Routing · Configure Call Routing > Translation Pattern overview · Checked 2026-09-24
  41. 41
    Cisco's 'Configure Unified CM for Webex Calling' article defines a Webex inbound CSS on Unified CM containing the DN, ESN, PSTNInternational and onNetRemote partitions.
    Configure Unified CM for Webex Calling · Calling search spaces section · Checked 2026-09-24
  42. 42
    Cisco's configuration adds a Unified CM route pattern for each DID range hosted on Webex Calling, using the full +E.164 pattern with a leading backslash and pointing to the RL_Webex route list.
    Configure Unified CM for Webex Calling · Route patterns section · Checked 2026-09-24
  43. 43
    Cisco's configuration gives the Unified CM SIP trunk to Webex (via the Local Gateway) an AAR CSS that reaches only PSTN reroute patterns (PSTNReroute).
    Configure Unified CM for Webex Calling · Calling search spaces / SIP trunk section · Checked 2026-09-24
  44. 44
    Webex Calling outgoing call permissions can allow or block these call types: internal, toll-free, national, international, operator assistance, chargeable directory assistance, special services I and II, and premium services I and II.
    Outgoing call permissions for Webex Calling locations · Call types section · Checked 2026-09-24
  45. 45
    Webex Calling dial patterns allow only X (one digit) and ! (any digit sequence, E.164 only, once at the end). X cannot appear in the middle of a number or be combined with !.
    Configure trunks, route groups, and dial plans for Webex Calling · Dial patterns section · Checked 2026-09-24
  46. 46
    Webex Calling dial plans, which route calls to on-premises destinations over trunks or route groups, are configured for the whole enterprise and apply to all users regardless of location.
    Configure trunks, route groups, and dial plans for Webex Calling · Dial plans section · Checked 2026-09-24
  47. 47
    Webex Calling allows at most 500 outgoing-permission digit patterns per location, user, workspace or virtual line.
    Outgoing call permissions for Webex Calling locations · Permissions by digit patterns · Checked 2026-09-24
  48. 48
    In Webex Calling outgoing call permissions, custom digit patterns on a user, workspace or virtual line are applied first and location settings apply if none match. Digit-pattern configuration takes precedence over permissions by call type.
    Outgoing call permissions for Webex Calling locations · Permissions by digit patterns · Checked 2026-09-24
  49. 49
    When Webex Calling needs abbreviated inter-site dialing but extensions overlap between locations, Cisco says to build an enterprise numbering plan by prefixing extensions with an access code and a site code.
    Design to migrate from Unified CM to Webex Calling · Webex Calling dial plan · Checked 2026-09-24
  50. 50
    Webex Calling internal extension length can be 2 to 10 digits, with a default of 4.
    Configure your Webex Calling dial plan · Internal extension length · Checked 2026-09-24
  51. 51
    Webex Calling's 'Allow extension dialing between locations' toggle is on by default and works if extensions are not duplicated across locations. When it is off, extension calls reach a matching extension in the caller's own location.
    Configure your Webex Calling dial plan · Allow extension dialing between locations · Checked 2026-09-24
  52. 52
    Cisco's design guidance says to set the maximum unknown extension length in Webex Calling so that calls from on-premises call control into Webex Calling are classified correctly.
    Design to migrate from Unified CM to Webex Calling · Webex Calling dial plan · Checked 2026-09-24
  53. 53
    For Unified CM and Webex Calling coexistence, Cisco says a dedicated Webex Calling partition on Unified CM is required to create a differentiated class of service for calls that originate from Webex Calling.
    Design to migrate from Unified CM to Webex Calling · On-premises dial plan in Unified CM · Checked 2026-09-24
  54. 54
    For each Webex Calling call type or digit pattern, an administrator can choose Allow, Block, Require Authorization Code, or Auto-transfer to number 1, 2 or 3, and can separately control whether transfers and forwards of that call type are allowed.
    Outgoing call permissions for Webex Calling locations · Permission options / Allow transfer/forwards · Checked 2026-09-24
  55. 55
    Webex Calling outgoing call permissions can be set for locations, users, workspaces and virtual lines.
    Outgoing call permissions for Webex Calling locations · Configuration levels · Checked 2026-09-24
  56. 56
    A Webex Calling route group contains at least one and at most 10 trunks. An enterprise can have up to 10,000 route groups and 10,000 dial plans, each dial plan with up to 10,000 dial patterns.
    Configure trunks, route groups, and dial plans for Webex Calling · Route groups section and limits table · Checked 2026-09-24
  57. 57
    The Webex Calling location routing prefix length is 1 to 7 digits and includes the steering digit, so a length of 4 leaves 3 digits for the site code.
    Configure your Webex Calling dial plan · Location routing prefix length · Checked 2026-09-24
  58. 58
    When a Webex Calling location enables routing of unknown extensions, calls from its users to unknown 2-10 digit extensions go to the selected trunk or route group as premises calls.
    Configure trunks, route groups, and dial plans for Webex Calling · Calls to on-premises extensions · Checked 2026-09-24
  59. 59
    In Cisco's coexistence design, when a +E.164 range moves to Webex Calling, an urgent route pattern matching that range is added to the Webex Calling partition on Unified CM.
    Design to migrate from Unified CM to Webex Calling · On-premises dial plan in Unified CM · Checked 2026-09-24

Documents

tier 2 current vendor documentation

Cisco CallManager Administration Guide, Release 4.1(3) - Calling Search Space Configuration

Cisco Systems · accessed 2026-09-24

tier 2 current vendor documentation

Cisco CallManager System Guide, Release 4.0(1) - Partitions and Calling Search Spaces

Cisco Systems · accessed 2026-09-24

tier 2 current vendor documentation

Configure Partition and Calling Search Space

Cisco Systems · 2016-05-05 · accessed 2026-09-24

tier 2 current vendor documentation

Configure trunks, route groups, and dial plans for Webex Calling

Cisco Systems, Inc. (Webex Help Center) · 2026-09-07 · accessed 2026-09-16

tier 2 current vendor documentation

Configure Unified CM for Webex Calling

Cisco Webex · 2024-05-18 · accessed 2026-09-24

tier 2 current vendor documentation

Configure your Webex Calling dial plan

Cisco · 2026-04-22 · accessed 2026-09-23

tier 2 current vendor documentation

Design to migrate from Unified CM to Webex Calling

Cisco Systems, Inc. (Webex Help Center) · accessed 2026-09-16

tier 2 current vendor documentation

Outgoing call permissions for Webex Calling locations

Cisco Systems, Inc. (help.webex.com) · 2025-10-16 · accessed 2026-09-16

tier 2 current vendor documentation

System Configuration Guide for Cisco Unified Communications Manager Release 15 and SUs - Configure Call Routing

Cisco · accessed 2026-09-21

tier 2 current vendor documentation

System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions

Cisco Systems · 2026-09-22 · accessed 2026-09-24

tier 2 current vendor documentation

Troubleshooting Guide for Cisco Unified Communications Manager, Release 12.5(1) - Dial Plans and Routing Issues

Cisco Systems · 2023-11-24 · accessed 2026-09-24

Cite this page

APA

WarmTransfer. (2026, September 24). Unified CM dial plan partitions and calling search spaces. WarmTransfer. https://warmtransfer.net/knowledge/cucm-dial-plan

BibTeX

@misc{warmtransfer-cucm-dial-plan,
  title  = {Unified CM dial plan partitions and calling search spaces},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/cucm-dial-plan},
  note   = {Verified 2026-09-24}
}