# Unified CM call pickup and call park

Canonical: https://warmtransfer.net/knowledge/cucm-call-pickup-park

Last verified: 2026-09-24

In Unified CM, Call Pickup lets users answer calls that arrive on a directory number other than their own[^47]. Call Park lets a user on an active call press Park to hold the call at a call park extension, which another phone then dials to retrieve the call[^28].

## Call pickup mechanisms

Unified CM provides three pickup softkeys: PickUp for the user's own group, GPickUp for another group or a directed directory number (DN), and OPickUp for associated groups[^50]. With Group Call Pickup (GPickUp softkey), the user connects to the incoming call that has been ringing the longest in the target group[^20]. Other Group Pickup (OPickUp softkey) searches the groups associated with the user's pickup group; when several associated groups are configured, the association priority takes precedence over ringing time[^27]. Each Unified CM call pickup group can be associated with at most 10 other call pickup groups[^21].

A user can be assigned to only 1 call pickup group[^26]. Cisco does not recommend assigning different lines of the same phone to different call pickup groups because it can confuse users[^22]. Directed Call Pickup is invoked by pressing GPickUp and entering the directory number of the device that is ringing[^17]. However, Directed Call Pickup cannot pick up a call ringing on a hunt list member when that call was placed to the hunt pilot number[^16]. With BLF Call Pickup, a flashing BLF DN indicates a call to pick up, and the picking-up line is either the next available line or a specified line[^5].

## Call pickup configuration and parameters

A directory number is placed in a pickup group via the Call Pickup Group drop-down in the Call Forward and Call Pickup Settings area of Directory Number Configuration[^18]. If call pickup group numbers are placed in a partition, only phones whose calling search space can reach that partition can use the pickup group[^49]. A call pickup group number assigned to lines or directory numbers cannot be deleted until those assignments are changed, and edits to the group number propagate to all assigned DNs[^19].

A call pickup group's notification policy is configured as No Alert, Audio Alert, Visual Alert, or Audio and Visual Alert[^24]. The call pickup group notification timer accepts an integer from 1 to 300 seconds[^25].

Two clusterwide service parameters manage pickup timings:
- The Pickup Locating Timer service parameter (1 to 5 seconds) sets the maximum time Unified CM takes to identify alerting calls across all nodes in the cluster[^48].
- The Call Pickup No Answer Timer service parameter (12 to 300 seconds) controls how long before a call that was picked up but not answered is restored[^23].

Auto call pickup (controlled by the Auto Call Pickup Enabled service parameter) connects the user straight to the picked-up call; without it, the user must press an additional softkey to complete the connection[^4]. An auto call pickup produces 2 CDRs, whereas a non-auto pickup produces 1[^3]. When Auto Call Pickup Enabled is False and a user presses a pickup softkey, the ringing line's configured call forwarding is ignored for that call[^6].

## Call park

A call park number or range uses digits plus at most 2 X wildcards, allowing 1 range (for example 80XX) to yield up to 100 park extensions[^42]. Unified CM can park only 1 call at each call park extension number[^38]. Each call park number or range is tied to 1 Unified CM node through the Unified Communications Manager field, and by default every node needs its own unique park numbers[^40]. The clusterwide service parameter Enable cluster-wide Call Park Number/Ranges (Feature - General) defaults to False and decides whether Call Park is cluster-wide or bound to a specific node[^7].

For call park to survive failover and fallback, park numbers should be configured on the publisher and on the subscriber nodes[^30]. For shared lines on devices registered to different nodes, the line registers to the node on which a device registers first, meaning each node must carry park numbers[^45].

The Call Park Display Timer service parameter defaults to 10 seconds and sets how long the park number is shown on the parking phone[^29]. The Call Park Reversion Timer service parameter defaults to 60 seconds; when it expires, an unretrieved parked call returns to the device that parked it[^43]. If a hunt group member parks a call that arrived through a hunt pilot, the call goes back to the hunt pilot when the Call Park Reversion Timer expires[^31].

A call park range may be placed in a partition to restrict which calling search spaces can reach it, or left in `<None>` for unrestricted access[^39]. If the same park range is reused in different partitions, users should have only 1 of those partitions in their calling search space[^44]. Users can retrieve a call parked on another Unified CM cluster by dialling an intercluster-trunk route pattern that covers the park number (for example 80XX, dialling 8022)[^32]. Over QSIG intercluster trunks, the parked party does not see the "To parked number" message[^41]. The music on hold a parked caller hears is chosen by the parking phone's Network Hold MOH Audio Source setting[^33].

The Release 15 Call Park task flow runs: clusterwide Call Park, partition, call park number, softkey template, associate template with common device configuration, associate softkey with phone, Call Park button, then Park Monitoring[^46].

### Park monitoring

Park Monitoring is an optional Call Park feature in which Unified CM watches a parked call and, once its timer expires, forwards it to a preassigned number, sends it to voicemail, or returns it to the parker[^35]. Park Monitoring uses 3 timers: Reversion (wait before prompting the parker), Periodic Reversion (interval between reminders), and Forward No Retrieve (reminder period before forwarding)[^37]. These timers can be set on a directory number, hunt pilot, or universal line template, and a value of 0 or empty falls back to the corresponding service parameter[^36]. When the Park Monitoring Forward No Retrieve destination is left empty, the call returns to the parker once the Forward No Retrieve timer expires[^34].

## Directed call park

Directed Call Park is transfer-based: the user presses Transfer, dials a directed call park number, and completes the transfer, rather than using the Park softkey[^15]. Directed call park numbers exist cluster-wide, unlike default Call Park numbers, which are bound to a node[^11]. The Retrieval Prefix is a required directed call park field, and a parked call is retrieved by dialling the retrieval prefix followed by the directed park number[^12].

Parking to a directed call park number that already holds a call gives the user busy tone and the message "Park Slot Unavailable"[^10]. If a directed call park number has no Reversion Number, an unretrieved call reverts to the parker after the Call Park Reversion Timer expires[^13]. Phones that support directed call park BLF buttons can monitor the busy or idle state of specific directed call park numbers[^9].

Cisco recommends not configuring both Directed Call Park and the Park softkey, and if both are used, their number ranges must not overlap[^8]. The Release 15 Directed Call Park task flow runs: clusterwide Directed Call Park, directed call park number, BLF/Directed Call Park buttons, then synchronize with affected devices[^14].

## Endpoint-specific settings

On Cisco IP Phone 8800 enterprise firmware, the Dedicate One Line for Call Park setting decides whether a parked call stays on the user's line (resumable with Resume) or moves to a call park line[^2]. Assisted Directed Call Park on 8800 phones lets a user park a call with a single button press using the Direct Park feature[^1].

WarmTransfer's reading of the sources is that core pickup and park parameters (timer ranges and defaults, XX limit, 1 call per slot, directed park retrieval prefix) likely hold across Release 12.5(1), Release 14, and Release 15 because they read identically across those guides[^51].

## See also

See also [Unified CM hunt pilots and hunt lists and line groups](https://warmtransfer.net/knowledge/cucm-hunt-pilots).
See also [Unified CM dial plan partitions and calling search spaces](https://warmtransfer.net/knowledge/cucm-dial-plan).
See also [Unified CM service parameters that change transfer behaviour](https://warmtransfer.net/knowledge/cucm-service-parameters-for-transfer).

## Applicability

Applies to: Cisco Unified Communications Manager and Cisco IP Phone 8800 Series on Unified Communications Manager. Deployments: on-premises. Sources checked 2026-09-24. The Release 15 Call Park task flow and Directed Call Park task flow specifically define the configuration sequences for Release 15[^46][^14].

## What remains uncertain

- Mapping Unified CM pickup groups and park ranges to Webex Calling call pickup and call park groups during migration is not covered by the sources below.
- Call pickup and call park support in Jabber and Webex App registered to Unified CM is not covered by the sources below.
- The default value of the Auto Call Pickup Enabled service parameter is not covered by the sources below.
- Current phone models supporting Park Monitoring (such as desk phones on Unified CM) are not covered by the sources below.
- CTI and JTAPI park events for attendant consoles and park monitoring on third-party applications are not covered by the sources below.
- The default values of the Park Monitoring Reversion, Periodic Reversion, and Forward No Retrieve timers are not covered by the sources below.
- Reconciling the hunt-pilot pickup group rule with the directed pickup hunt pilot restriction is not covered by the sources below.
- Call pickup and call park behaviour under SRST and Unified SRST Manager is not covered by the sources below.

## Sources

[^1]: Assisted Directed Call Park on 8800 phones lets a user park a call with a single button press using the Direct Park feature. Source: [Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager - Phone Features and Setup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/8800-series/english/adminguide/P881_BK_C136782F_00_cisco-ip-phone-8800_series/P881_BK_C136782F_00_cisco-ip-phone-8811-8841_chapter_01011.html), Feature table (Assisted Directed Call Park). Checked 2026-09-24.
[^2]: On Cisco IP Phone 8800 enterprise firmware, the Dedicate One Line for Call Park setting decides whether a parked call stays on the user's line (resumable with Resume) or moves to a call park line. Source: [Cisco IP Phone 8800 Series Administration Guide for Cisco Unified Communications Manager - Phone Features and Setup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cuipph/8800-series/english/adminguide/P881_BK_C136782F_00_cisco-ip-phone-8800_series/P881_BK_C136782F_00_cisco-ip-phone-8811-8841_chapter_01011.html), Product-specific configuration table (Dedicate One Line for Call Park). Checked 2026-09-24.
[^3]: An auto call pickup produces two CDRs while a non-auto pickup produces one. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Call Pickup Interactions (Call Accounting). Checked 2026-09-24.
[^4]: Auto call pickup (Auto Call Pickup Enabled service parameter) connects the user straight to the picked-up call; without it the user must press an additional softkey to complete the connection. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Configure Auto Call Pickup. Checked 2026-09-24.
[^5]: With BLF Call Pickup a flashing BLF DN indicates a call to pick up, and the picking-up line is either the next available line or a specified line. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), BLF Call Pickup Overview. Checked 2026-09-24.
[^6]: When Auto Call Pickup Enabled is False and a user presses a pickup softkey, the ringing line's configured call forwarding is ignored for that call. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Call Pickup Interactions (Call Forwarding). Checked 2026-09-24.
[^7]: The clusterwide service parameter Enable cluster-wide Call Park Number/Ranges (Feature - General) defaults to False and decides whether Call Park is cluster-wide or bound to a specific node. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Configure Clusterwide Call Park. Checked 2026-09-24.
[^8]: Cisco recommends not configuring both Directed Call Park and the Park softkey, and if both are used their number ranges must not overlap. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Directed Call Park Overview. Checked 2026-09-24.
[^9]: Phones that support directed call park BLF buttons can monitor the busy or idle state of specific directed call park numbers. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Directed Call Park Overview; Configure BLF/Directed Call Park Buttons. Checked 2026-09-24.
[^10]: Parking to a directed call park number that already holds a call gives the user busy tone and the message Park Slot Unavailable. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Directed Call Park Overview. Checked 2026-09-24.
[^11]: Directed call park numbers exist cluster-wide, unlike default Call Park numbers, which are bound to a node. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Directed Call Park Overview. Checked 2026-09-24.
[^12]: The Retrieval Prefix is a required directed call park field, and a parked call is retrieved by dialling the retrieval prefix followed by the directed park number. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Directed Call Park Configuration Fields (Retrieval Prefix); Directed Call Park Overview. Checked 2026-09-24.
[^13]: If a directed call park number has no Reversion Number, an unretrieved call reverts to the parker after the Call Park Reversion Timer expires. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Directed Call Park Configuration Fields (Reversion Number). Checked 2026-09-24.
[^14]: The Release 15 Directed Call Park task flow runs: clusterwide Directed Call Park, directed call park number, BLF/Directed Call Park buttons, then synchronize with affected devices. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Directed Call Park Task Flow. Checked 2026-09-24.
[^15]: Directed Call Park is transfer-based: the user presses Transfer, dials a directed call park number, and completes the transfer, rather than using the Park softkey. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Directed Call Park Overview. Checked 2026-09-24.
[^16]: Directed Call Pickup cannot pick up a call ringing on a hunt list member when that call was placed to the hunt pilot number. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Call Pickup Restrictions. Checked 2026-09-24.
[^17]: Directed Call Pickup is invoked by pressing GPickUp (Group Pickup) and entering the directory number of the device that is ringing. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Directed Call Pickup Overview. Checked 2026-09-24.
[^18]: A directory number is placed in a pickup group via the Call Pickup Group drop-down in the Call Forward and Call Pickup Settings area of Directory Number Configuration. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Assign a Call Pickup Group to Directory Numbers. Checked 2026-09-24.
[^19]: A call pickup group number that is assigned to lines or directory numbers cannot be deleted until those assignments are changed, and edits to the group number propagate to all assigned DNs. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Call Pickup Restrictions. Checked 2026-09-24.
[^20]: With Group Call Pickup (GPickUp softkey) the user is connected to the incoming call that has been ringing the longest in the target group. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Group Call Pickup Overview. Checked 2026-09-24.
[^21]: Each Unified CM call pickup group can be associated with at most 10 other call pickup groups. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Other Group Pickup Overview. Checked 2026-09-24.
[^22]: Cisco does not recommend assigning different lines of the same phone to different call pickup groups because it can confuse users. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Call Pickup Restrictions. Checked 2026-09-24.
[^23]: The Call Pickup No Answer Timer service parameter (12 to 300 seconds) controls how long before a call that was picked up but not answered is restored. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Configure Auto Call Pickup. Checked 2026-09-24.
[^24]: A call pickup group's notification policy is one of No Alert, Audio Alert, Visual Alert, or Audio and Visual Alert. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Call Pickup Group Configuration Fields. Checked 2026-09-24.
[^25]: The call pickup group notification timer accepts an integer from 1 to 300 seconds. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Call Pickup Group Configuration Fields. Checked 2026-09-24.
[^26]: A user can be assigned to only one call pickup group. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Other Group Pickup Overview. Checked 2026-09-24.
[^27]: Other Group Pickup (OPickUp softkey) searches the groups associated with the user's pickup group, and when several associated groups are configured the association priority takes precedence over ringing time. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Other Group Pickup Overview. Checked 2026-09-24.
[^28]: Call Park lets a user on an active call press Park to hold the call at a call park extension, which another phone then dials to retrieve the call. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Call Park Overview. Checked 2026-09-24.
[^29]: The Call Park Display Timer service parameter defaults to 10 seconds and sets how long the park number is shown on the parking phone. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Configure Clusterwide Call Park. Checked 2026-09-24.
[^30]: For call park to survive failover and fallback, park numbers should be configured on the publisher and on the subscriber nodes. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Call Park Restrictions. Checked 2026-09-24.
[^31]: If a hunt group member parks a call that arrived through a hunt pilot, the call goes back to the hunt pilot when the Call Park Reversion Timer expires. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Call Park Interactions (Hunt Groups). Checked 2026-09-24.
[^32]: Users can retrieve a call parked on another Unified CM cluster by dialling an intercluster-trunk route pattern that covers the park number (for example 80XX, dialling 8022). Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Call Park Overview. Checked 2026-09-24.
[^33]: The music on hold a parked caller hears is chosen by the parking phone's Network Hold MOH Audio Source setting. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Call Park Interactions (Music On Hold). Checked 2026-09-24.
[^34]: When the Park Monitoring Forward No Retrieve destination is left empty, the call returns to the parker once the Forward No Retrieve timer expires. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Configure Park Monitoring. Checked 2026-09-24.
[^35]: Park Monitoring is an optional Call Park feature in which Unified CM watches a parked call and, once its timer expires, forwards it to a preassigned number, sends it to voicemail, or returns it to the parker. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Park Monitoring. Checked 2026-09-24.
[^36]: Park Monitoring timers can be set on a directory number, hunt pilot or universal line template, and a value of 0 or empty falls back to the corresponding service parameter. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Configure Park Monitoring. Checked 2026-09-24.
[^37]: Park Monitoring uses three timers: Reversion (wait before prompting the parker), Periodic Reversion (interval between reminders) and Forward No Retrieve (reminder period before forwarding). Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Configure Park Monitoring. Checked 2026-09-24.
[^38]: Unified CM can park only one call at each call park extension number. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Call Park Restrictions. Checked 2026-09-24.
[^39]: A call park range may be placed in a partition to restrict which calling search spaces can reach it, or left in <None> for unrestricted access. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Call Park Configuration Fields (Partition). Checked 2026-09-24.
[^40]: Each call park number or range is tied to one Unified CM node through the Unified Communications Manager field, and by default every node needs its own unique park numbers. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Call Park Overview; Call Park Configuration Fields (Unified Communications Manager). Checked 2026-09-24.
[^41]: Over QSIG intercluster trunks the parked party does not see the To parked number message. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Call Park Interactions (QSIG Intercluster Trunks). Checked 2026-09-24.
[^42]: A call park number or range uses digits plus at most two X wildcards, so one range (for example 80XX) gives up to 100 park extensions. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Call Park Configuration Fields (Call Park Number/Range). Checked 2026-09-24.
[^43]: The Call Park Reversion Timer service parameter defaults to 60 seconds; when it expires an unretrieved parked call returns to the device that parked it. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Configure Clusterwide Call Park. Checked 2026-09-24.
[^44]: If the same park range is reused in different partitions, users should have only one of those partitions in their calling search space. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Configure a Partition for Call Park. Checked 2026-09-24.
[^45]: For shared lines on devices registered to different nodes, the line registers to the node on which a device registers first, so each node must carry park numbers. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Call Park Restrictions. Checked 2026-09-24.
[^46]: The Release 15 Call Park task flow runs: clusterwide Call Park, partition, call park number, softkey template, associate template with common device configuration, associate softkey with phone, Call Park button, then Park Monitoring. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_c6f1c31d_00_call-park-and-directed-call.html), Call Park Task Flow. Checked 2026-09-24.
[^47]: In Unified CM, Call Pickup lets users answer calls that arrive on a directory number other than their own. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Call Pickup Overview. Checked 2026-09-24.
[^48]: The Pickup Locating Timer service parameter (1 to 5 seconds) sets the maximum time Unified CM takes to identify alerting calls across all nodes in the cluster. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Configure Auto Call Pickup. Checked 2026-09-24.
[^49]: If call pickup group numbers are placed in a partition, only phones whose calling search space can reach that partition can use the pickup group. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Configure Partitions for Call Pickup. Checked 2026-09-24.
[^50]: Unified CM uses three pickup softkeys: PickUp for the user's own group, GPickUp for another group or a directed DN, and OPickUp for associated groups. Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 15 and SUs - Call Pickup](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/cucm_b_feature-configuration-guide-for-15/cucm_mp_caf87bc5_00_call-pickup-12-0.html), Configure a Softkey Template for Call Pickup (softkey table). Checked 2026-09-24.
[^51]: Core pickup and park parameters (timer ranges and defaults, XX limit, one call per slot, directed park retrieval prefix) read the same in the 12.5(1), 14 and 15 guides, so answers based on them likely hold across those releases (inferred). Source: [Feature Configuration Guide for Cisco Unified Communications Manager, Release 12.5(1) - Call Park and Directed Call Park](https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/admin/12_5_1/featureConfig/cucm_b_feature-configuration-guide-1251/cucm_b_feature-configuration-guide-1251_chapter_011100.html), Configure Clusterwide Call Park; Directed Call Park Overview (compared with Release 15 chapter). Checked 2026-09-24.