Grandstream UCM6300 Call Recording: Complete Setup, Storage, Security and Retrieval Guide
Learn how to build a secure business call recording or conversation recording solution with a Grandstream UCM6300 series IP PBX, from automatic recording and USB SSD storage to NAS archiving, access control and precise retrieval for quality or compliance reviews.
Published by TekkPak Technologies · Reviewed 27 August 2026 · Based on Grandstream UCM6300 firmware documentation current in August 2026
Quick answer: Grandstream UCM6300 systems can automatically record calls associated with selected extensions, trunks, inbound routes, outbound routes, ring groups, IVRs and call queues. Calls can also be recorded manually using the configurable Start/Stop Call Recording feature code, commonly *3. Audio recordings are stored as WAV files and can be searched through Call Detail Records using caller, callee, date, time, call type, trunk, status and other filters.
For storage, the UCM can use built in local storage, USB flash media, a USB connected HDD or SSD, SD card, a mounted NAS, or eligible GDMS cloud storage. SFTP data synchronization and scheduled backups can create additional protected copies.
In this guide
- What a UCM call recording solution does
- Business benefits and use cases
- Recording and storage methods
- Where automatic recording can be enabled
- Complete configuration guide
- How to find and retrieve an exact call
- Security and deletion controls
- Industries that use call recording
- Retention and compliance practices
- Frequently asked questions
What is a Grandstream UCM6300 call recording solution?
It is an on premises IP PBX based system that captures selected business conversations, associates each recording with searchable call data and keeps control of the files within the organisation's chosen storage architecture.
Capture
Record all calls matching a defined policy, such as every call on a customer service queue, a regulated trunk or selected extensions.
Index
Associate recordings with CDR information such as caller, callee, start time, answer time, call time, talk time, status, trunk and unique call ID.
Retrieve
Filter for a targeted call, play it in the authorised web interface, download its WAV file or export filtered CDR evidence to CSV.
Recording is not the same as legal compliance. A UCM provides the technical capability to capture, protect and retrieve calls. Your organisation remains responsible for consent notices, lawful purpose, access rules, retention periods, customer privacy, evidence handling and any sector specific requirements. Obtain advice from your legal or compliance team before recording production calls.
Why businesses record customer conversations
A well governed recording system turns voice interactions into an auditable operational resource while improving service quality and accountability.
Quality assurance
Supervisors can review real calls against a consistent scorecard and identify coaching opportunities in greeting, discovery, accuracy, empathy and closure.
Agent training
Use approved examples to demonstrate effective objection handling, de escalation and problem solving without relying only on theory.
Dispute resolution
Verify what was said about an order, price, delivery, instruction, service request or commitment and resolve disagreements using the actual conversation.
Compliance evidence
Maintain a searchable trail of selected conversations where policy or regulation requires recording, subject to the organisation's approved retention design.
Customer insight
Analyse recurring objections, questions and service failures to improve products, scripts, processes, FAQs and customer experience.
Risk control
Investigate suspected fraud, social engineering, unauthorised commitments or policy deviations while preserving a clear review trail.
Every practical way to store UCM6300 call recordings
Choose the primary recording location for performance and capacity, then add independent synchronization or backup where resilience and retention require it.
Built in local storage
The simplest option for a small deployment or pilot. New recordings remain inside the UCM appliance. Monitor capacity closely and avoid treating a single appliance as the only long term copy.
USB flash drive
A compatible USB flash device can increase recording capacity. Use enterprise quality media, protect the physical port and enable storage usage alerts.
External USB hard disk
A USB connected HDD offers economical high capacity for longer retention. Use reliable power, appropriate environmental protection and tested media.
External USB SSD
A USB connected SSD provides silent operation, low power consumption and no moving parts. It is an attached storage device, not a replacement for the UCM's built in storage.
NAS infrastructure
Mount a dedicated network share using its IP address, folder path and restricted service credentials. Once mounted, the NAS becomes a selectable recording path in File Manager and Recording Files.
SD card or GDMS cloud
Supported UCM6300 hardware provides an SD card interface. Eligible RemoteConnect plans may also expose GDMS cloud recording storage. Availability depends on the model, firmware and plan.
What about SFTP and backup storage? SFTP Data Sync can automatically synchronize CDR records, recordings, voicemail and fax data to a remote server. Scheduled backup tasks can also target NAS, SFTP, USB, SD card or Amazon S3. These are valuable secondary copies, but they should be distinguished from the active location where the UCM writes each new recording.
| Storage method | Best fit | Main advantage | Important consideration |
|---|---|---|---|
| Local UCM storage | Small office or proof of concept | Fastest setup | Limited capacity and single device risk |
| USB flash | Small to medium recording volume | Simple capacity expansion | Media quality and physical protection |
| USB HDD | High capacity at lower cost | Large economical storage | Power, vibration and mechanical wear |
| USB SSD | Business critical local storage | Low latency, silent and robust | Use a reliable enclosure and validated power arrangement |
| NAS | Central IT and multi team access | Scalable, monitored infrastructure | Network availability, NAS permissions and backup policy |
| GDMS cloud | Eligible RemoteConnect deployments | Off appliance storage | Plan entitlement, capacity and data governance |
Where can automatic call recording be enabled?
Use the narrowest scope that reliably captures the required conversations. This reduces unnecessary personal data, storage use and review workload.
Extensions
Record calls handled by selected employees or functions, such as a complaints officer, order desk or treasury user.
VoIP and analogue trunks
Record calls using a particular business line or service provider connection when the whole channel is in scope.
Inbound and outbound routes
Apply recording according to call direction, destination, dial pattern, DID or routing policy.
Call queues
Record customer service, helpdesk, sales or contact centre calls handled through a defined queue.
Ring groups and IVRs
Capture calls entering a department ring group or a particular automated attendant journey.
Manual recording
Allow approved users to start and stop recording during an active call using the configured feature code and recording whitelist.
Step by step: configure call recording on Grandstream UCM6300
Menu wording can change slightly between firmware releases. Take a full configuration backup first, use current stable firmware and test the complete workflow before production use.
Define the recording and retention policy
Before changing the PBX, document exactly what the organisation intends to record and why.
- Identify in scope extensions, trunks, queues and routes.
- Decide whether recording is automatic, manual or both.
- Confirm the approved notice or consent process.
- Define retention, access, download, deletion and legal hold responsibilities.
- Estimate monthly storage and growth with a safety margin.
Update safely and set the correct clock
System Settings → Time SettingsConfirm the correct time zone and NTP synchronization. Accurate time is essential because CDR retrieval, evidence review and exported reports depend on reliable timestamps.
Before any firmware update, create and securely retain a full UCM backup. Grandstream's current firmware page should be checked for release notes and model specific instructions.
Connect and verify the storage device
For USB flash, HDD, SSD or SD card, connect the device to the appropriate UCM port and confirm that the system detects it. Use storage that is dedicated to the PBX wherever possible.
For NAS, create a dedicated share and a service account with access limited to the required folder. Keep the NAS and UCM on a protected network segment with reliable connectivity.
PBX Settings → File Manager → Storage Device Management → NAS- Enable NAS recording functionality.
- Enter the NAS IP address in Host. The current manual notes IP address support for this field.
- Enter the Folder Path for the recording share.
- Enter the dedicated NAS username and password.
- Select a Security Mode supported by the NAS. The current default is NTLMSSP.
- Save, apply and confirm that Status shows Mounted.
Select the active recording path and failover priority
PBX Settings → File Manager- Locate Recording Files.
- Select Local, the detected USB device, NAS, SD card or eligible GDMS Cloud Storage as required.
- If using multiple targets, enable Auto Change and arrange the Storage Path Priority.
- When moving from Local to supported external storage, use Migrate Local Recordings if existing files must be copied. The current manual states that migration copies the files and does not delete the originals.
- Save and apply the configuration.
Configure an external disk usage alert so the IT team is warned before space becomes critical.
Maintenance → System Events → Alert Events ListEnable encryption for stored recording files
PBX Settings → Security Settings → Data/File Encryption- Select call recording files among the data types to encrypt.
- Save the encryption setting. Newly created files will then use the policy.
- If older recordings also require encryption, select the applicable stored file type and run the encryption action.
- Export the secret key, protect it with a strong password and store it separately in an approved secure location.
- Test an authorised offline decryption using Grandstream's UCM63xx CDR/Recording Decryption Tool.
Critical: if the encryption key is changed, export and secure the new key. Without the correct key file and its password, downloaded encrypted recordings may not be recoverable.
Enable automatic recording at the correct scope
Choose one or more of the following paths. Open the relevant item, enable Auto Record, save and apply.
| Recording scope | Typical UCM menu path | Use when |
|---|---|---|
| Extension | Extension/Trunk → Extensions → Edit Extension | Every handled call for selected users is in scope |
| VoIP trunk | Extension/Trunk → VoIP Trunks → Edit | All traffic on a selected trunk should be captured |
| Inbound route | Extension/Trunk → Inbound Routes → Edit | Recording depends on incoming DID or route |
| Outbound route | Extension/Trunk → Outbound Routes → Edit | Recording depends on dial pattern or call direction |
| Call queue | Basic Call Features → Call Queue → Edit | Customer service or call centre calls are in scope |
| Ring group or IVR | Basic Call Features → Ring Group or IVR → Edit | A department or call journey is in scope |
Avoid enabling overlapping policies without testing. A call may touch several objects during its journey, so confirm the resulting recording behaviour for transfers, forwards, queues and external destinations.
Configure controlled manual recording
PBX Settings → Feature Codes → Start/Stop Call Recording- Confirm or change the feature code. Grandstream documents *3 as the default.
- Choose whether the code is allowed for the caller, callee, both sides or disabled.
- Enable the Recording Whitelist.
- Add only the extensions authorised to use the manual recording function.
- During an active call, the authorised user dials *3 followed by # or Send to begin recording, then repeats it to stop. Recording also stops when the call ends.
Create least privilege access for reviewers
Maintenance → User Management → Custom Privilege- Create a role such as Recording Reviewer.
- Grant only the required CDR Records, CDR Recordings or Queue Recordings modules.
- Leave Allow Deletion of CDR Recordings disabled for reviewers who only need to search, play or download.
- Create or edit the reviewer's account and assign this custom privilege.
- Enable multi factor authentication for administrative users and use unique accounts rather than shared credentials.
Add synchronization, backup and retention tasks
Maintenance → Backup → Data SyncTo synchronize recording data to an SFTP server, enable Data Sync, enter the SFTP account, password, server address, destination directory and daily synchronization time. Test connectivity before saving, then perform an initial manual synchronization.
Maintenance → Task Management → Backup / Data Sync / CleanerSchedule backups and approved cleanup tasks so capacity management follows the written retention policy. Never enable automatic deletion until the date logic, legal hold process and secondary copy have been tested.
Run a production acceptance test
- Make inbound, outbound and internal test calls for every in scope route.
- Test queue calls, transfers, forwards and calls that cross multiple recording scopes.
- Confirm the announcement or consent workflow where required.
- Verify timestamp, caller, callee, duration and recording playback.
- Test search, single download, batch download, encrypted offline decryption and CSV export.
- Confirm an unauthorised account cannot delete recordings.
- Check operation logs, storage alerts, synchronization and restore procedures.
How to find and retrieve one specific recorded conversation
For an investigation, complaint or compliance request, begin with CDR filters instead of browsing thousands of audio filenames.
Search through CDR
- Log in using an authorised reviewer account.
- Go to CDR → CDR.
- Set a narrow Start Time and End Time window.
- Enter the caller number, caller name or callee number if known.
- Add Call Type, Status, source trunk, destination trunk, extension group or account code if useful.
- Click Filter and compare the remaining records.
- Open detailed call information where necessary to review transfer information and the full call journey.
- Use the play icon to listen in the browser or the download icon to obtain the WAV file.
- Click Download Search Result(s) to export the filtered CDR entries as CSV.
Use Recording Files
- Go to CDR → Recording Files.
- Select the correct storage location, such as Local, USB or mounted NAS, as available.
- Select the recording category, such as call, queue or conference recordings.
- Sort by Caller, Callee or Call Time.
- Select individual files and click Download, or use Download All only for an approved bulk export.
- If external storage contains more than 5,000 files, use Scan to retrieve additional file information.
- For queue specific reviews, also check Basic Call Features → Call Queue → Queue Recordings.
- If file encryption is enabled, use the official decryption tool with the correct exported key and key password.
Preserve an evidence package. For a significant call, retain the original downloaded recording, the filtered CDR CSV, the request or case reference and a short access note stating who retrieved it, when and for what approved purpose. If evidential integrity matters, your compliance or forensic procedure may also require a cryptographic hash, read only storage and documented chain of custody.
Details available when retrieving a call
How UCM6300 helps prevent unauthorised access or deletion
No single protocol prevents every deletion. Protection comes from layered identity, privilege, encryption, logging, network and storage controls.
Role based privileges
Custom privileges can separate CDR Records, CDR Recordings and Queue Recordings access. The deletion permission for CDR recordings can be withheld from reviewer accounts.
Multi factor login
MFA, unique administrator accounts, login timeouts, failed login limits and IP banning reduce the risk of compromised web access.
Operation logging
The Super Administrator can review date, username, source IP address, result, page operation, specific operation and remarks for web interface activity.
Data and file encryption
Recordings on internal or attached storage can be encrypted. Offline access then requires the correct key file, its password and Grandstream's decryption tool.
HTTPS, TLS and SRTP
HTTPS protects web administration, TLS can protect SIP signalling and SRTP can protect supported voice media in transit. These controls do not replace file permissions or retention safeguards.
Independent storage controls
A properly designed NAS or archive can add restricted service accounts, network segmentation, snapshots, immutable retention or write once controls outside the UCM where required.
Important security limitation: the UCM's custom privilege and audit features reduce unauthorised deletion risk, but they do not by themselves create tamper proof or regulator compliant retention. A privileged administrator may still have powerful access, and operation logs are not a substitute for an independently protected archive. For strict compliance, design the NAS or archive controls with the customer's security and compliance team.
Business sectors that benefit from conversation recording
The strongest use cases combine clear business purpose, controlled access and a retention period matched to actual risk.
Banking and financial services
Record selected dealing, service, verification and complaint calls under the institution's approved regulatory architecture.
Contact centres and BPOs
Support quality assurance, agent coaching, client reporting, complaint review and service level improvement.
Healthcare
Review appointment, billing and service interactions while applying strict privacy and need to know access.
Insurance
Verify disclosures, policy servicing conversations, claim notifications and customer instructions.
Legal and professional services
Preserve approved client instructions and service discussions where recording is lawful and professionally appropriate.
Retail and ecommerce
Confirm orders, delivery details, returns, warranties, prices and customer service commitments.
Hospitality and travel
Review reservations, changes, cancellations, guest requests and service recovery conversations.
Education
Improve admissions and support quality while applying extra care to student privacy and safeguarding requirements.
Utilities, logistics and government
Document service requests, dispatch instructions, public enquiries and incident communications under approved policies.
Call recording best practices for reliable operations
Record selectively
Capture the minimum set of calls needed for the stated purpose. Avoid collecting every conversation merely because the technology allows it.
Separate reviewer and administrator roles
Give quality reviewers playback access without deletion rights, and reserve configuration changes for a smaller administrative group.
Test restoration, not only backup
A successful backup job is useful only if the recording, CDR and encryption key can be restored and used when required.
Monitor capacity and failures
Configure storage usage, external disk status, NAS and Data Sync alerts. Review them regularly rather than waiting for missing recordings.
Protect keys separately
Keep exported encryption keys and their passwords in an approved secure system, separate from the recording storage and ordinary user accounts.
Review the policy periodically
Reassess scope, notices, retention, access and deletion whenever business processes, regulations, firmware or storage architecture changes.
Grandstream UCM6300 call recording FAQ
Does Grandstream UCM6300 have built in call recording?
Yes. The UCM6300 series can automatically record calls for configured extensions, trunks, routes, queues, ring groups and IVRs. Approved users can also start and stop a recording manually with a feature code.
Where are UCM6300 call recordings stored?
Depending on configuration and availability, recordings can be written to local UCM storage, USB flash media, a USB connected HDD or SSD, SD card, a mounted NAS, or eligible GDMS cloud storage. SFTP Data Sync and scheduled backups can maintain additional copies.
Can Grandstream UCM6300 record calls directly to NAS?
Yes. Add the NAS under File Manager storage device management, enter its IP address, folder path, dedicated credentials and compatible security mode, and confirm Mounted status. The NAS then becomes an available recording storage path.
Can I use an external SSD or hard disk for recordings?
Yes. Grandstream documents attached storage including USB HDD, USB SSD and USB flash drives. Use compatible, reliable media and confirm detection, power stability, free capacity, alerts and recovery before production use.
How do I find a recording from a particular caller and date?
Open CDR, set the Start Time and End Time, enter the caller or callee number, add call type, status or trunk filters if needed, and click Filter. The matching CDR entry can expose playback and download actions when a recording exists.
What information is stored with a recorded call?
The associated CDR can include caller and callee information, start, answer and end time, call and talk duration, status, call type, action, trunks, channels, account code, session and unique ID. Available fields depend on the call and export selection.
Can a normal UCM user delete call recordings?
Deletion depends on the user's assigned privileges. A custom reviewer role can receive CDR or recording access while the permission to delete CDR recordings remains disabled. Use least privilege accounts, MFA and operation log review.
Are UCM6300 recordings encrypted?
They can be encrypted by enabling Data/File Encryption for recording files. Downloaded encrypted audio requires Grandstream's decryption tool, the matching exported key file and the key password for offline use.
What format does UCM6300 use for audio call recordings?
The current Grandstream manual identifies WAV as the downloadable audio call recording format. Meeting or video recording formats can differ.
Is a Grandstream UCM call recording system automatically compliant?
No. It provides technical recording, storage, access and retrieval capabilities. The customer must design lawful notice or consent, retention, privacy, access, backup, legal hold and tamper protection around the relevant jurisdiction and sector rules.
Related Grandstream and IP telephony guides
Need a secure Grandstream call recording solution?
TekkPak Technologies is a Grandstream Authorized Reseller in Pakistan. We can help design the UCM model, recording policy, storage capacity, NAS integration, access roles, encryption, retrieval workflow and acceptance testing for your business environment.
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