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

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/15/systemConfig/cucm_b_system-configuration-guide-15/cucm_b_system-configuration-guide-14_chapter_010000.html

Published

2026-09-22

Updated

unknown

Accessed

2026-09-24

HTTP status

200

License

Cisco documentation; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• Cisco documents building classes of service from partitions and CSSs, with an example ladder of Base_CSS (emergency and internal), LocalPSTN_CSS, NationalPSTN_CSS and InternationalPSTN_CSS, each adding call types to the previous one. in context
• The list of partitions in a calling search space is limited to a maximum of 1024 characters. in context
• When a calling search space is assigned both to the caller's phone and to the caller's directory number, Unified CM concatenates the two and searches the partitions of both. in context
• A calling search space is a prioritized (ordered) list of partitions that determines which call destinations a caller can reach. in context
• Calling search spaces are created at Call Routing > Class of Control > Calling Search Space, by moving partitions from Available Partitions to Selected Partitions and ordering them with the arrow buttons. in context
• A calling search space name can be up to 50 alphanumeric characters. in context
• Deleted partitions cannot be retrieved. in context
• Partition names may contain alphanumeric characters, spaces, hyphens and underscores. in context
• Because of the 1024-character limit, the number of partitions a CSS can hold falls as partition names get longer: Cisco's table gives 340 for 2-character names, 172 for 5, 92 for 10 and 64 for 15. in context
• Before a partition can be deleted, the items that use it must be moved to a different partition or deleted. in context
• In Unified CM a partition is a logical group that can hold route patterns, directory numbers, translation patterns, transformation patterns, URIs and hunt pilots. in context
• Partitions are created at Call Routing > Class of Control > Partition with Add New, and several partitions can be entered at once by putting each on its own line. in context
• A partition can carry a time schedule, and a time-zone setting (Originating Device or a Specific Time Zone) decides which clock the schedule is compared against. in context
• 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. in context
• Unified CM calling search spaces can be assigned to directory numbers and to devices such as phones and gateways. in context
• 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. in context
• A Unified CM calling search space (CSS) is an ordered list of route partitions. in context
• 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. in context
• A Unified CM 15 calling search space name can be up to 50 characters and may contain alphanumerics, spaces, periods, hyphens and underscores. in context
• 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. in context
• 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. in context
• 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. in context
• Partitions are configured in Cisco Unified CM Administration under Call Routing > Class of Control > Partition. in context
• Unified CM 15 partition names can contain alphanumeric characters, spaces, hyphens and underscores. in context
• Unified CM partitions divide the route plan into logical subsets based on accessibility requirements, organization, location and call type. in context
• 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. in context
• The Unified CM 15 partition configuration task flow configures partitions (step 1) before calling search spaces (step 2). in context

Cite this source record

APA

WarmTransfer. (2026, September 22). System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-cucm-sysconfig-15-partitions

BibTeX

@misc{warmtransfer-cisco-cucm-sysconfig-15-partitions,
  title  = {System Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Configure Partitions},
  author = {{WarmTransfer}},
  year   = {2026},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-cucm-sysconfig-15-partitions},
  note   = {Cisco Systems, accessed 2026-09-24}
}