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The Enterprise Voice, Video, and Messaging Session Manager must be configured to only enable the extension mobility feature for endpoints on a per user basis.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-259989SRG-NET-000018-VVSM-00101SV-259989r1117236_ruleCCI-001368medium
Description
Extension mobility is a feature of a VVoIP system that permits a person to transfer their phone number extension and phone features (or configuration) to a phone that is not in their normal workspace. This is useful when a person is visiting a remote office away from their normal office and typically functions within an established enterprise wide VVoIP system where the system is designed as a contiguous system. In this case, the system is typically a single vendor solution. The system might be within one LAN/CAN may include multiple LAN/CANs at multiple interconnected sites. To activate this feature, the user approaches a phone that is not their regular phone and identifies themselves to the phone system via a username, password, pin, code, or some combination of these. Upon validation, the system configuration manager will configure the temporary phone to match the configuration of the user's regular phone. Minimally, the phone number is transferred and possibly some or all of the user's speed dial numbers and other personal preferences. This capability is dependent upon the capabilities of the temporary phone. Once activated the user's inbound calls are directed to the temporary location. The user's regular phone may or may not maintain its normal capabilities and also may also answer inbound calls. Extension mobility is similar to but not the same as forwarding calls. Forwarding is typically activated from the user's normal phone or their user preferences configuration settings. Forwarding is therefore pre-set to a known location. Extension mobility is typically activated from the remote location and is activated upon arrival at that location. Extension mobility should be available only to those individuals that need to use the feature.
STIGDate
Enterprise Voice, Video, and Messaging Session Management Security Requirements Guide2026-05-23

Related Frameworks

1 mapping across 5 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (17) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AST-04Network Diagrams & Data Flow Diagrams (DFDs)
1.00
AST-04.2Control Applicability Boundary Graphical Representation
1.00
CFG-02Secure Baseline Configurations
1.00
CRY-01Use of Cryptographic Controls
1.00
DCH-01Data Protection
1.00
DCH-19Geographic Location of Data
1.00
END-01Endpoint Device Management (EDM)
1.00
END-04Malicious Code Protection (Anti-Malware)
1.00
END-06Endpoint File Integrity Monitoring (FIM)
1.00
IAC-21Least Privilege
1.00

+7 more (top 10 by confidence shown)

NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (42) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-2(1)Automated System Account Management
1.00
AC-2(10)Shared and Group Account Credential Change
1.00
AC-2(2)Automated Temporary and Emergency Account Management
1.00
AC-2(3)Disable Accounts
1.00
AC-2(4)Automated Audit Actions
1.00
AC-3Access Enforcement
1.00
AC-3(7)Role-based Access Control
1.00
AC-4Information Flow Enforcement
1.00
AC-6(10)Prohibit Non-privileged Users from Executing Privileged Functions
1.00
AC-6(9)Log Use of Privileged Functions
1.00

+32 more (top 10 by confidence shown)

NIST 800-1710 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

3.1.3
1.00
CCI1 mapping
CCI-001368
1.00
NIST CSF 2.00 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (4) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

DE.CM-09
1.00
ID.AM-03
1.00
PR.DS-10
1.00
PR.IR-01
1.00

Who does this work

18 NICE work roles and 10 EC-Council certifications.

This is an inference across published mappings, not a single claim by anyone. This check maps to a control, which maps to a Cybersecurity Framework outcome, which NIST assigns to the work roles below. EC-Council separately maps its certifications to those same roles.

A certification prepares someone for a role. It is not evidence that a holder is qualified, and neither NIST nor EC-Council has stated that any certification here addresses this check.

Work-role assignments published by NIST (NICE Framework Components 2.2.0 and the CSF 2.0 OLIR crosswalk). Certification mappings published by EC-Council.

Details

Check Text (C-259989r1117236_chk)

Verify the configuration for the extension mobility feature is only available when enabled per user. Confirm the following specific security features are configured: - The feature is enabled/disabled on a per user basis. - Feature activation requires user authentication minimally using a user unique PIN (preferably including a unique user ID). - Feature is not activated using a common activation code, or feature button on the phone. - The user (or system administrator) can manually disable the feature at their discretion. - The user may have the capability to set duration when activating the feature. (Optional) - The feature automatically deactivates based on a period of inactivity or the time of day. If the extension mobility feature is enabled and does not meet the above specific security features, this is a finding.

Fix Text (F-63627r946997_fix)

Configure the extension mobility feature only when enabled per user. Confirm the following specific security features are configured: - The feature is enabled/disabled on a per user basis. - Feature activation requires user authentication minimally using a user unique PIN (preferably including a unique user ID). - Feature is not activated using a common activation code, or feature button on the phone. - The user (or system administrator) can manually disable the feature at their discretion. - The user may have the capability to set duration when activating the feature. (Optional) - The feature automatically deactivates based on a period of inactivity or the time of day.