Privacy Policy

Yeastar Information Technology Co., Ltd. built the Yeastar Linkus Mobile Client app as a Free app. This Service is provided by Yeastar Information Technology Co., Ltd. at no cost and is intended for use as is.

This page is used to inform you regarding our policies with the collection, use, and disclosure of Personal Information if anyone decided to use our Service.

Linkus is used with Yeastar P-Series PBX System, Yeastar Cloud PBX, Yeastar S-Series VoIP PBX or Yeastar K2 IP-PBX (hereinafter collectively referred to as “Yeastar PBX Systems”), which provides communication and collaboration services for users. Linkus processes the personal data of the individuals who participate in these communications. If you choose to use our Service, then you agree to the collection and use of information in relation to this policy. We will not use or share your information with anyone except as described in this Privacy Policy.

Information we collect

Through your usage of Linkus, Yeastar processes different kinds of information. Some of it is personally identifiable and some are non-identifying or aggregated. Here are the types of information we collect or receive:

      • Personal Information – This includes all the information associated with your Linkus Extension. It includes names and full contact details for the individual or business that created the account.  This is vital for PBX administrative purposes and basic call functions.
      • Sensor Usage – During Linkus login via QR code, your device’s acceleration sensor is used for improved photo effects. During calls, the distance sensor is used to enable on-ear mode. When you access the privacy policy, help and feedback, free trial, or legal terms, we utilize your gyroscope sensor to automatically adjust the display orientation. When you use the video call function, we will also access your magnetic field sensor, proximity sensor, accelerometer, and ambient light sensor during video calls in order to enable automatic screen off and screen rotation for landscape or portrait orientation.
      • Camera Permission and WiFi Signal Strength — When you use the video call function, we will provide you with the corresponding features after obtaining your consent to access the microphone and camera permissions. In order to optimize the audio and video quality when your WiFi connection is unstable, we may collect information about the strength of your WiFi signal.
      • Trunk – This is the telephone numbers of the trunks created on the system and used for basic call functions.
      • Call Detail Records (CDRs) – This is a record of the communication that has traversed the Yeastar PBX Systems. It typically includes source/destination name, source/destination number, source/destination IP, and other metrics. CDRs allow you to check call detail records.
      • Device Identifiers – This typically includes the unique device identifiers that let the PBX know which unique device you are using to access our Service, which can be used to customize our service to your device or analyze any device issues related to our services.
      • Local Phone Contacts – This includes the name and phone number information of your local phone contacts and will be used only when you are using the Linkus Mobile Client. This is essential for you to use Linkus to look up or call your local phone contacts.
      • Call Recordings – Call recordings are disabled by default and are opt-in only. The stored information includes phone numbers of the call parties, IP address, and all the recorded conversation. The system also supports uploading custom prompt to notify both parties that the call is being recorded. What’s more, calling parties can stop/interrupt a recorded call to protect personal data from being stored
      • Voicemail – This includes the called party’s name, phone number, and all data left in the voicemail. This featured can be disabled if you do not want the system to store the above voicemail data. The system also supports uploading custom prompt to notify the party who left the voicemail about the personal data processing.
      • Conferencing – This includes the name and phone number of all participants in the conference call. If Call Recording is enabled and opted-in, all recorded conversation will also be included.
      • Instant Messaging Service – Instant Messaging Service (IM Service) is disabled by default. It includes messages, graphics, documents, or any other materials submitted by using this IM Service. All information is the sole responsibility of the person from whom such Data originated. You are wholly responsible for all download, uploaded or otherwise transmitted via the IM Service. Yeastar neither store nor is responsible for the Data that you submit to the IM Service. When you use the internal chat or external chat function, if you need to send instant photos or videos, we will provide you with the corresponding features after obtaining your consent to access the microphone and camera permissions. If you need to send photos, we will provide you with the corresponding features after obtaining your consent to access the device’s photo album permissions.
      • Software Installation List – SDKs may request access to your device’s software installation information: The MSAL SDK, developed by Microsoft, is used for SSO login. For more details on data handling and protection, please refer to Microsoft Privacy Policy; The 360 Security SDK, developed by Qihoo, is used for App diagnostics, security reinforcement and anti-piracy detection. For more details on data handling and protection, please refer to 360 Privacy Policy.


How Linkus use your information (process your data)

Yeastar uses your information for the following:

  • Provide communication services – To deliver telephony and communication services, the processing of Personal Data constitutes a natural part of Yeastar Cloud PBX.
  • Email messages – Yeastar may send you notifications and administrative emails, such as when you forgot your password, etc.


Data Retention

  • Call Recordings – If enabled Customers are in control of Call Recordings data which can be deleted on Linkus and deleted permanently via the Web portal.
  • Call Detail Records (CDRs) – CDRs can be deleted on Linkus and deleted permanently via the Web portal.
  • Voicemail – Voicemails can be deleted on Linkus and deleted permanently via the Web portal.


Children’s Personal Information

Our products, websites, and services are for adults. Children (aged under 14) must have parental or guardian consent to create personal accounts. If we collect personal information of children with consent, we will only use it legally, with explicit parental consent or to protect the child. If we unintentionally collect personal information of a child without verified parental consent, we will promptly delete it.

Sharing and Disclosure

There are times when communications and related content and other user information may be shared by Yeastar. With consent, to comply with legal process, or to protect Yeastar and our users. When we have your consent or if we believe that disclosure is reasonably necessary to comply with a law, regulation or legal request; to protect the safety, rights, or property of the public, any person, or Yeastar; or to detect, prevent, or otherwise address fraud, security or technical issues. If we receive law enforcement or other third party requests for information we will provide prior notice to the subject of the request where we are legally permitted to do so.

We might use third-party SDK services to implement Linkus services such as push notification and instant messaging for you. When you are using Linkus, the third-party SDK services might collect your personal information to make the services functions, and Yeastar will conduct security protections to ensure such processing of the data will remain secure and comply with legal or regulatory requirements.


Yeastar takes reasonable steps to protect the information you provide to us as part of your use of the Yeastar service from loss, misuse, and unauthorized access or disclosure. These steps take into account the sensitivity of the information we collect, process and store and the current state of technology. When you enter sensitive information (such as sign-in credentials) we encrypt the transmission of that information using secure socket layer technology (SSL) and encrypt all data at rest. We follow generally accepted standards to protect the personal data submitted to us, both during transmission and once we receive it.

If you need to obtain a copy of your personal information collected by us, you can contact us at any time. We will provide you with a copy of your personal information, upon your request and to the extent permitted by law and technological feasibility.

To ensure security, we may verify your identity before processing your request. Reasonable requests are generally free of charge, unless they are repetitive or exceed reasonable limits. We reserve the right to refuse unfounded requests, those requiring excessive technical efforts or posing risks to others’ rights and interests, and highly impractical requests. We cannot respond to requests related to legal obligations, national security, public safety, public health, significant public interests, criminal matters, subjective malicious intent or rights abuse, vital interests without consent, requests causing serious harm to rights and interests, and those involving trade secrets.

Changes to this Privacy Policy

Yeastar may change this policy from time to time. If you continue to use Yeastar after those changes are in effect, you agree to the revised policy. If the changes are material, we may provide more prominent notice or seek your consent to the new policy.

Contact Us

If you have any questions or suggestions about our Privacy Policy, do not hesitate to contact us.

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