S-Series FAQ

About Login

What is the default IP of S-Series VoIP PBX?

The default IP of S-Series VoIP PBX is

Why do I get an error message on the browser when I try to access the S-Series VoIP PBX?

This kind of error message, for example, “Your connection is not private” message in Chrome browser, is caused by SSL error. The S-Series VoIP PBX uses HTTPS protocol for login with a local IP address. But SSL certification authority don’t issue certificate for local IP address.
There is nothing to worry about and you can proceed to visit the link.
If you wish to get the SSL certificate, you need to bind a domain or public IP to the S-Series PBX, and then get the certification from the certification authority. You may need to pay for the certification.

What is the default username and password of the administrator account in S-Series VoIP PBX?

The default administrator account in S-Series VoIP PBX is “admin” and “password”. And for better security, we highly suggest that you change the default password after your first login.

How to change the password of the administrator account?

Please click s-se-faq-password and go to “My Settings” and change the password after you log in the Web GUI.
My settings

How to log in the Extension User Web Interface?

Input the PBX’s IP address and use the username and password to login. The username and default password are “extension number (e.g. 1000)” and “pass + extension number (e.g. pss1000)”.

We highly suggest that you change the default password in extension edit page after your first login.

How to change the default password of the user account?

Go to Settings → PBX → Extensions and change the “User Password” in the extension edit
edit extension

What can I do if I forgot my password?

You could click “Forgot Password?” on the login page to reset your password.
The prerequisites for this feature are:
1. The account is tied to an email address. If you are the administrator, you can configure by clickings-se-faq-passwordand “My Settings”.
If you are an extension user, you can log in the Extension User Web Interface and go to “Me” to tie an email to this account.
2. You have already configured the correct email settings and sent the test email successfully. Go to Settings→ System→ Email and input the email address, password, SMTP, POP3, ports and also tick “enable SSL/TLS” if needed.
Now let’s see how to reset the password.1. Click “Forgot Password?” in the login page.
S100 VoIP PBX Login Page
3. Input the username (extension number) and the system will send an email to your email box which is tied to the account.
4. Click the link in the email inbox to reset the password. Please note that the link is only valid in the local area network within 30 minutes.
5. Input a new password and retype the new password.

About Extension

How to change the extension range?

A. Go to Settings→ General→ Preferences and configure it in the “User Extensions”.
Extension Preferences

What is the range of extension numbers?

S-Series VoIP PBX can have extensions range from 2 digits to 7digits.

How to add an FXS extension?

Go to Settings→ PBX→ Extensions, click “add” in the extension edit page.
Tick “FXS” in “type” and choose the FXS span port.
1. Extensions on S-Series VOIP PBX can be “SIP”, “IAX” and “FXS” at the same time.
2. If the extension has ticked “FXS”, you must assign an FXS port for the extension. If the FXS port in the drop-down list is RED, it means the FXS port is being used and you cannot choose this port. If the port is BLACK, it means the port is idle.
Edit Extension

How to register an IP phone or softphone to S-Series VoIP PBX?

A. S-Series VoIP PBX have passed compatibility test with lots of IP phone brands, such as Yealink, Grandstream, Cisco, Polycom, Snom, etc.

The detailed configuration manual can be found here: https://www.yeastar.com/auto-provisioning-on-the-yeastar-s-series-voip-pbx/#phonesupported.

How to register a remote extension?

1. Make port mapping for communication ports of PBX on router. The default ports are:
UDP (SIP): 5060
UDP (RTP): 10000-12000
2. Go to Settings →PBX→General→SIP→NAT. If you use static IP for S-Series VoIP PBX, please select “External IP Address” on “NAT settings” and input the public IP address of S-Series VoIP PBX. If you use dynamic IP for PBX, please input the domain in “External Host” field on the NAT settings page.
3. Got to Settings→ PBX→ Extensions. Choose the extension that needs to be registered remotely, clickedit. Select “Advanced” page, enable “NAT” and “Register Remotely”.
4. Register to this extension configured.

For more configuration details please refer to this link: https://support.yeastar.com/hc/en-us/articles/229524467-Configuring-Remote-Extensions

What is mobility extension? How to configure it?

Mobility extension is used to bind mobile number with an extension, so this mobile number will have the corresponding extension’s call privilege, such as: make internal calls, make outgoing calls, and play voicemail unread, etc. When the user uses this mobile number to call into S-Series VoIP PBX, the PBX will treat it as the corresponding extension, and he/she will hear the dial tone.

To configure mobility extension, follow the steps below.
1. Click Settings → PBX → Extensions, go to extension edit page. Click “Edit”.
2. Bind a mobile phone number in “Mobile Number” in “Basic” tab.
Edit Extension
3. Click “Features”, and go to “Mobility Extension” settings. If you enable mobility extension, when the mobile number configured calls into S-Series VoIP PBX, it can act like this extension number, such as: make internal calls, make outgoing calls, and play voicemail unread, etc. If you enable Ring Simultaneously, the extension and the mobile phone will ring simultaneously.

Please note that you must configure the specific prefix to make sure S-Series VoIP PBX can reach this mobile number according to the outbound route.

1. When a mobility extension makes an internal call, the caller ID presented on the called party’s screen will be the extension number instead of the mobile number.
2. The telephony line/trunk must have caller ID feature. Since PBX recognizes mobile number according to the caller ID detected.
3. Mobility extension feature can’t take effect if administrator has enabled call back feature in inbound routings.

What’s SIP forking in S-Series VoIP PBX? How to configure it?

SIP forking is a feature that enables an extension number to be registered by multiple SIP terminals simultaneously; and the amount of terminals can be 5 at most.
Click Settings → Add/Edit Extension, and modify Concurrent Registrations.
Edit Extension

How to select the extensions as a group in S-Series VoIP PBX?

In S-Series VoIP PBX there is a feature called “Extension Group”. We could custom the extension group by adding the extensions you want to this group and name it.
Here’s how to configure the extension group:
1. Go to Settings → PBX → Extension Group, click “Add” in the extension list page.
2. Create an extension group, input the name of the group and choose the extensions to the selected box.
Edit Extension Group
3. After creating the extension group, you could choose the extension group into the selected box on the extension edit page instead of choosing extensions one by one. For example, when you create a queue, you could select an extension group.
Edit Queue

About Auto Provisioning

Which IP phones can be auto provisioned on S-Series VoIP PBX?

S-Series supports auto provisioning of IP phones from Yealink, Cisco, Snom, Panasonic, Mitel, Grandstream, Polycom, Htek, Fanvil, VTech, etc. Please find more details about the brands and models at: https://www.yeastar.com/compatible-sip-terminals/.

What IP phones can I use with S-Series VoIP PBX?

Auto provision supported IP phones are all thoroughly tested with S-Series VoIP PBX and are compatible. More details can be found here. IP phones which support standard SIP protocol are also compatible with S-Series VoIP PBX.

If my phone model is not supported in the list of auto provisioning, how can I auto provision my phones?

Create and edit configuration file according to your needs. The file format should be .cfg or .xml.
Note: The configurations and the file name should meet the requirements of the IP phone manufacturers. Generally, the file name is the MAC address of the phone, e.g. 001565212512.cfg.
Step 1. Connect your phones and the PBX to the same local network.
Step 2. Make sure your phones are ready for auto provisioning.
  • PnP mode
    Enable PnP if your IP phone supports PnP function.
  • DHCP mode
    1) If your IP phone does not support PnP, then enable DHCP.
    2) Enable DHCP server on your PBX, set the TFTP address to the IP address of the PBX.
    Path: Settings > System > Security > Service
    Note: Make sure PBX is the only one DHCP server in your local network, or auto provisioning would fail.
DHCP server
Step 3. Upload the configuration file into PBX.
Path: Auto Provisioning > Upload Files > Upload a File.
Step 4. Restart IP phones manually. IP phone will obtain configuration file from PBX and finish auto provisioning.

If my IP phone does not support configuration on Web interface, how to register extensions to S-Series VoIP PBX?

Step 1: Only IP phones which support SIP protocol are allowed to register to S-Series PBX, such as Panasonic KX-TSC11 and Cisco 8800.
Step2: Change IP phone’s firmware version to the one that supports SIP protocol. The firmware is usually available at the official website of the phone manufacturer. If you cannot find it, please consult the phone manufacturer.
Step 3: Finish registration by entering registration information on IP phone Web GUI.

How to synchronize the IP phone time with the time of S-Series VoIP PBX?

Configure the time on Auto Provisioning configuration page.
Step1. Select and edit the phone.
Step2. On the Preference page, set the NTP server as the IP address of the S-Series PBX.
Step3. Click “Save” and reboot the phone to take effect.
edit device

How to share phonebooks by using remote phonebook?

The configuration details can be found in this knowledge base article.

How to upload local phonebook into S-Series VoIP PBX?

The configuration details can be found in this knowledge base article.

How to share phonebooks via LDAP Sever?

The configuration details can be found in this LDAP Server Guide.

Why does auto provisioning not work for my IP phones?

1. Make sure that you have only one S-Series VoIP PBX in your local network.
2. Make sure that your IP phones and the S-Series PBX are in the same network, and the phones and the S-Series PBX could communicate with each other.
3. Reboot your phones manually.
If after that, the function still cannot work, please submit a ticket on Support Portal for help.

Can Auto Provisioning work when IP phones and PBX are in VLAN environment?

No. Auto Provisioning will work only when IP phones and PBX are in the same local area network. Neither VLAN nor VPN can make the function work.

How to disable Auto Provisioning function?

You can do one of the following configurations to disable Auto Provisioning:
1. Delete the IP phones from Auto Provisioning> Device List page.
2. Disable TFTP Sever on the PBX.
3. Uninstall Auto Provisioning application from the PBX.

Can I upgrade IP phones’ firmware via Auto Provisioning?

Yes. Follow the steps below to upgrade your phones.
1. Register your phones to the PBX via Auto Provisioning.
2. Go to Auto Provisioning > Firmware Upgrade to upload the phone’s firmware file.
3. Reboot the phone to take effect.
auto provisioning
Note: only IP phones that can be auto provisioned by S-Series PBX support this kind of upgrade.

About Trunks

How to register a VoIP trunk in S-Series VoIP PBX?

1. Go to Settings → PBX → Trunk, Click add to add a VoIP trunk.
2. Select protocol and trunk type.
VoIP Trunk
3. Input the VoIP information which is provided by the ISP. For example:
Provider Name: Chinamobile
Hostname/IP: the registration IP given by the ISP (e.g.
Port: 5060
Domain: The domain server given by ISP (e.g. ims.fj.chinamobile.com)
Username: the username given by ISP (e.g. 865921111111@ims.fj.chinamobile.com )
Password: the account password given by the ISP
From user: the trunk number given by the ISP (e.g. +86592111111)
4.For more details please refer to S-Series VoIP PBX Administrator Guide.

About Call Control

How to configure the outbound routes in S-Series VoIP PBX?

1. Go to PBX Monitor → Trunk to check the status of the trunk and make sure the trunk is available to use.
2. Go to Settings → PBX → Call Control → Outbound Routes, click add in the outbound routes list page.
3. Fill in the details in the edit page and save. For example, you could configure the outbound routes as follows if you want 1000, 1005 and 1006 to use FXO1-7 to dial out.

For more details, please refer to the S-Series VoIP PBX Administrator Guide.
Edit Outbound Routes

How to configure the inbound routes in S-Series VoIP PBX?

1. Go to Settings → PBX → Call Control → Inbound Routes, click add in the inbound routes list page.
2. In the inbound routes edit page, you should select the trunk to the selected box and choose the destination to direct the call. The time condition can be set up in order to direct the call according to time periods. The example is shown as follows. For more details, please refer to S-Series VoIP PBX Administrator Guide.
Add Inbound Route

How to guide your incoming calls to the different destinations in different time periods with Time Condition?

1. Go to PBX → Call Control → Time Conditions, and add the conditions or the holiday if you need.
Time Conditions
2. Go to Settings → PBX → Call Control → Inbound Routes, click edit to edit on the inbound routes list page.
Tick “Enable Time Condition” and click add , add the time condition and set up the destination. The period which doesn`t match the time condition you create will lead to destination in “[other time]”.
Add Inbound Route

How to override the time condition and how to cancel the override?

1. Check the feature code on the inbound routes edit page. There are three feature codes in the following picture: “*801”, “*802” and “*800.” “*800” is used to cancel the override and reset the destination to the origin status.
Time Condition
2. Use the extension to press the feature code like “*801” to override the Time Condition “Workday”.
3. The overwritten Time Condition will have a check mark sign before it.
Time Condition
4. If you want to cancel the override and lead calls to the original destinations you have set up, you could use the extension to press the Reset feature code, like “*800” in the example.

What is AutoCLIP? How to use it?

S-Series VoIP PBX will automatically record outgoing calls into the AutoCLIP route list. When the called party calls back, the system will lead the call to the extension which dialed this number recently.

To set up AutoCLIP:
1. Go to Settings → PBX → Call Control → AutoCLIP Routes, and open the AutoCLIP configuration page.
2. The fields in the AutoCLIP:
Record Keep Time: how long each record will be kept in the AutoCLIP List.
Digits Match: how many digits from the last digit of the incoming phone number will be used to match the AutoCLIP record.
Member trunks: AutoCLIP Route will apply to which trunk and which trunk`s record will be kept in the list.

Where to see the AutoCLIP record list?

Go to Settings → PBX → Call Control → AutoCLIP Route, click “View AutoCLIP List” to check the information.

About Calls

Why am I hearing a beep sound before the dial tone when my phone is off hook?

That is because you have unread voicemails, please dial “*2” to listen to it. There will be no beep sound again if all the voicemails are read.

About Call Feature

How to use allowlist/blocklist feature in S-Series VoIP PBX?

A. The blocklist is used to filter the number. If a number is in the blocklist, the user will not be able to dial out or dial in. The allowlistt is used to put the number in the trust field.
1. You can input numbers with patterns in blocklist/allowlist.
E.g. if you want to restrict the number starting with 0592 from being dialed, but allow calling the number range of 05925503301-05925503309, you could put “0592550330z” in the allowlist and “0592” in the blocklist.
2. Allowlist has higher priority than blocklist.

About Call Recording

Where can I store call recording files?

You can store the auto recording files in:
1. External storage devices, such as HDD, USB, TF/SD card
2. Network Drive

Can I back up call recording files?

No, you cannot back up call recording files.

How to set auto cleanup of recording files?

Go to Settings -> System -> Storage -> Auto Cleanup -> Recordings Auto Cleanup, and design max usage of device and longest preservation period.
Auto Cleanup

What is the format of recording files?

The file format is .wav.

When call recording is enabled, will a prompt be played notifying the calling and called parties that the call is being recorded?

Yes, you can set up the prompt in Settings -> PBX -> Recording. If it’s an external call (inbound or outbound call through a trunk), the external party will hear the prompt no matter he is the called party or caller. If it’s an internal call, the called party will hear the prompt.

Do the extension users have permission to manage call recording files?

By default, only the super administrator has the permission to manage call recording files. The administrator can go to Settings > System > User Permission to add permission to desired users.
call recording files

Can I record all the calls which are made through a specific trunk?

Yes. Go to Settings> PBX> Recordings, select the desired trunk, click Save and Apply.
All the calls through the selected trunk will be recorded.

How to check recordings via File Share?

The configuration details can be found this knowledge base article

About Voice Prompts

How to change system prompt in S-Series VoIP PBX?

S-Series VoIP PBX allows two ways to modify the system prompt: update manually or download online prompt.
Manually update:
1. Go to Settings → PBX → Voice Prompts→ System Prompt
2. Browse a local “.tar” file and click “Upload”
3. You could download the system prompt file in the links below

Afrikaans VoicePrompts
American English VoicePrompts
Arabic VoicePrompts
Australian English VoicePrompts
British English VoicePrompts
Chinese VoicePrompts
Czech VoicePrompts
Danish VoicePrompts
Deutschland VoicePrompts
Dutch VoicePrompts
Finnish VoicePrompts
French VoicePrompts
Canadian French VoicePrompts
Greek VoicePrompts
Hebrew VoicePrompts
Hungarian VoicePrompts
Italian VoicePrompts
Korean VoicePrompts
Norwegian VoicePrompts
Persian VoicePrompts
Polish VoicePrompts
Portuguese VoicePrompts
Brazilian Portuguese VoicePrompts
Russian VoicePrompts
Slovak VoicePrompts
Spanish VoicePrompts
Latin American Spanish VoicePrompts
Mexican Spanish VoicePrompts
Swedish VoicePrompts
Thai VoicePrompts
Turkish VoicePrompts

Download online prompt:
Go to Settings → PBX → Voice Prompts → System Prompt
Click “Download Online Prompt” and choose the prompt you want.
Download Online Prompt

How to change the voicemail prompts?

1. Super admin can set voicemail prompts played over all internal extensions.
Step1: Go to Settings -> PBX -> Voice Prompts -> Custom Prompts, and upload prompt files to PBX.
Step2: Go to Settings -> PBX -> General -> Voicemail -> Greeting Options and select the custom prompt to be applied.
Step3: Click “Save” and “Apply”.
Greeting Options
2. Extensions users can also set their own voicemail prompt.
Step1: Login to user account via Web GUI.
Step2: Go to Me-> Extension Settings, and change the voicemail prompt.
voicemail prompt

Which audio file format does S-Series VoIP PBX support?

File format: “.wav”, “.WAV”, or “.gsm”.
File size: smaller than 8MB.
Supported wav format:

  • PCM, 8K, 16bit, 128kbps;
  • alaw (g.711), 8k, 8bit, 64kbps;
  • u-law (g.711), 8k, 8bit, 64kbps;
  • gsm, 6.10, 8k, 13kbps.

How to convert audio file format?

You can convert audio file format in two ways, by web tool or Wave Pad. Please visit this knowledge base article for details.

What’s the maximum duration of a custom audio file?

There is no duration limit for custom audio files.

How to disable custom voicemail prompt?

Step 1: Delete the applied custom audio file on S-Series VoIP PBX Web interface.
Step 2: Dial *2 on an extension.
Step 3: Follow the prompt, and press 0->4->2 sequentially.

About Hardware

What’s the power consumption of S-Series VoIP PBX?

S412: 9.0-25.6W
S20: 1.8-10.6W
S50: 2.1-18.5W
S100: 5.5-41.2W
S300: 6.2-59.1W

Does S-Series VoIP PBX support rack mounting?

S412: No
S20: No
S50: Yes, need mounting ears (Yeastar supplied)
S100: Yes
S300: Yes

How many modules does S-Series VoIP PBX support? What kind of module can be installed?
What’s the maximum number of modules allowed to be installed on each model of S-Series:

S412: 4
S20: 2
S50: 4
S100: 8
S300: 12

Model.Module S412 S20 S50 S100 S300
S2 Module Max. 2 Max. 2 Max. 4 Max. 8 Max. 12
O2 Module Max. 2 Max. 2 Max. 4 Max. 8 Max. 12
SO Module Max. 2 Max. 2 Max. 4 Max. 8 Max. 12
B2 Module Max. 2 Max. 2 Max. 4 Max. 8 Max. 12
GSM/3G/4G Module Max. 1 Max. 1 Max. 4 Max. 6 Max. 6

Note: only one channel can use cellular data of 4G LTE SIM card. And the 4G LTE module must be installed in the first slot of the EX08 Expansion Board in Span1.

Are there any requirements for the storage space of external storage devices?

No. Storage space does not matter.

What is the recommended TF/SD card?

Write Speed >= 60MB/s

  • Sandisk Extreme Pro Series
  • Sandisk Extreme Series

Does Yeastar supply antenna and antenna extension cable?

If you order GSM/3G/4G modules, your S-Series VoIP PBX will be supplied with the relevant number of antennas, but not antenna extension cable. You need to buy an extension cable if you need it. Please refer to the knowledge base article to see specifications of Yeastar supplied antenna.

What are the model names of GSM/3G/4G LTE Modules?

GSM Module: SIM800
3G Module: UC15
4G LTE Module: EC20 or EC25

About Backup and Upgrade

Could the backup file work in a different model of S-Series VoIP PBX?

No, the backup file will not work across different models.

Which files can I back up in S-Series VoIP PBX?

You can select to back up the following files in S-Series PBX:
1. System Settings
2. Custom Prompts
3. Call Logs

Can I store the auto-generated backup files to an external storage device?


How to check auto-generated backup files by the file name?

The name of the auto-generated backup files is in the format: model_firmware version_date_time.
For example, the file name “S300_30.6.0.6_201711151539” means that the file was generated on S300 with firmware version at 15:39 on November 15, 2017.

Is it necessary to reset S-Series VoIP PBX before upgrading?

No, it’s unnecessary.

How to upgrade S-Series VoIP PBX without the Internet?

There are two ways available:
1. Upload local firmware to S-Series PBX
2. Upgrade through TFTP Server
It is easier to upgrade by uploading local firmware. Please refer to the configuration at https://support.yeastar.com/hc/en-us/articles/115011710888-How-to-Do-Firmware-Update-for-S-Series VoIP PBX-PBX.

If I upgrade the S-Series VoIP PBX’s firmware, will the Apps in App Center be upgraded automatically?

1. The PBX Center and Auto Provisioning App will be upgraded to the latest version automatically when you upgrade the S-Series’ firmware.
2. For other Apps, you need to upgrade them independently.
Note: if you cannot upgrade an application to the latest version, you need to upgrade the S-Series’ firmware first.

What can I do if I forget the SSH login password?

1. Create a backup file on the S-Series PBX.
2. Download the backup file to your PC.
3. Reset the S-Series PBX.
4. Restore the backup file to the S-Series PBX.
5. Use the default password (iyeastar) to log in the S-Series PBX via SSH.

Where to download the latest firmware of S-Series VoIP PBX?

Download the firmware file here at https://www.yeastar.com/firmware-download/

When I download a firmware .bin file from the website, and try to open the file, I’m asked to enter a password, what can I do?

The firmware file is encrypted so you can’t open it, but you don’t need to. Just upload the .bin file to your S-Series PBX to upgrade the firmware.

Will the S-Series PBX be reset to factory settings automatically after upgrade?

No, it won’t.

Is it necessary to check “Reset Configuration to Factory Default” before downgrading?

Yes, it’s necessary.

Can I restore backup files generated in higher version of firmware on S-Series PBX with lower firmware version?

No, restoring of backup files is only allowed to be carried out between PBXs with the same firmware version.


Why does the new change on the S-Series VoIP PBX configuration not take effect?

Please click “Apply” on the upper-right corner of the page if you want to save the modified configuration. It will take 1-2 seconds to make it work.

How many Ethernet modes do S-Series VoIP PBX have? And what is the difference?

S-Series VoIP PBX supports three Ethernet modes: Single, Dual and Bridge.
Single: only use LAN port, WAN port will not be in use.
Dual: the two ports are being used. But it is necessary to choose the default interface on Network configuration page.
Bridge: LAN port will be used for uplink connection. WAN port will be used as bridge for PC connection.

Why do we need to configure the default interface when the Ethernet mode is “Dual”?

When the Ethernet mode is dual, all the communication packet will go through the default interface except for the routes in the “Static Route”.

How can the administrator assign permission to the extension?

1. Go to Settings → System → User Permission, click s-se-faq-trunk-14 on user permission list page.
2. Tick the check box before the permission you want to assign.
Grant Privilege

When Call Recording is enabled, how to notify the called party that the call will be recorded?

1. Go to Settings → PBX → Recording,
2. Set up “Internal Calls Being Recorded Prompt” and “Outbound/Inbound Calls Being Recorded Prompt”, click “Save”.

Which ports should I forward if I want to use Linkus Mobile Client in a public network?

The default ports your need to forward are:

  • Linkus server port: TCP 8111 & UDP 8111
  • SIP port: UDP 5060
  • RTP ports: UDP 10000-12000.

Note: TCP 8111 is only required when downloading and playing one touch recordings and voicemails in Linkus Mobile Client.

What’s the correspondence between time duration of recordings and usage of storage devices?

Usage.Capacity of Storage Device 50% 60% 70% 80% 90%
1GB 9.10 h 10.92 h 12.74 h 14.56 h 16.38 h
2GB 18.2 h 21.85 h 25.49 h 29.13 h 32.77 h
4GB 36.41 h 43.69 h 50.97 h 58.25 h 65.54 h
6GB 54.61 h 65.54 h 76.46 h 87.38 h 98.30 h
8GB 72.82 h 87.38 h 101.94 h 116.51 h 131.07 h
16GB 145.64 h 174.76 h 203.89 h 233.02 h 262.14 h
32GB 173.03 h 207.64 h 242.25 h 276.85 h 311.46 h
64GB 582.54 h 699.05 h 815.56 h 932.07 h 1048.58 h
128GB 1165.08 h 1398.10 h 1631.12 h 1864.14 h 2097.15 h
256GB 2330.17 h 2796.20 h 3262.24 h 3728.27 h 4194.30 h
512GB 4660.34 h 5592.41 h 6524.47 h 7456.54 h 8388.61 h
640GB 5825.42 h 6990.51 h 8155.59 h 9320.68 h 10485.76 h
1TB 9320.68 h 11184.81 h 13048.95 h 14913.08 h 16777.22 h
1.5TB 13981.01 h 16777.22 h 19573.42 h 22369.62 h 25165.82 h
2TB 18641.35 h 22369.62 h 26097.89 h 29826.16 h 33554.43 h
3TB 27962.03 h 33554.43 h 39146.84 h 44739.24 h 50331.65 h
4TB 37282.70 h 44739.24 h 52195.78 h 59652.32 h 67108.86 h

Note: a one-second recording needs 16KB space. So a one-minute recording need 16KB/s*60s=960KB space.

I want to use the built-in Music on Hold. Do I need a license?

The built-in music on hold files are distributed under the Creative Commons Attribution-ShareAlike 3.0 license through explicit permission from their authors.
The license can be found here.

If you didn’t find your answer in our FAQs, please visit our support portal.