Date: February 27, 2020

This release provides important security updates to protect your PBX from toll fraud. We strongly recommend that you upgrade your PBX.



Yeastar S50, S100 and S300 support Contacts feature.

  • The administrator can add external contacts such as the company's customers, resellers, and partners to Company Contacts for unified management, and share the Company Contacts with the employees to realize efficient office work.
  • The extension users can log in the PBX web interface by their accounts to add and manage their external contacts in Personal Contacts.
Note: Linkus with the following new versions supports synchronizing company contacts and personal contacts from PBX server. Users can check and manage external contacts on Linkus.
  • Linkus iOS version: 2.9.10 or later
  • Linkus Android version: 2.9.6 or later

Added SNMP feature.

The NMS (Network Management System) can monitor the PBX by SNMP protocol.


  • Optimized Mobility Extension: Added support for displaying original incoming caller ID on the mobile phone when the call is forwarded through a SIP trunk.

    Note: To achieve this, you need to configure the Transfer parameter From to The Originator Caller ID.
  • Optimized Mobility Extension: If Linkus is enabled for an extension, this extension has no Mobility Extension feature and the relevant settings are hidden automatically.
  • Fixed the Call Monitor issue: Bulk editing the Call Monitor setting of extensions could not take effect.
  • Fixed the SIP Trunk issue: There would be no sound through the SIP trunk on which T.38 was enabled when the PBX received a re-INVITE packet that contained no image media.
  • Fixed the issue of GSM trunk: If G722 code was enabled on the PBX, making calls through a GSM trunk would fail.
  • Fixed the SIP Trunk issue: Abnormal status of SIP trunk was displayed if the trunk name contained the characters span.
  • Fixed the SIP Trunk issue: No caller name was contained in the P Asserted Identify field of INVITE packet when calling out through a SIP trunk.
SIP relevant
  • Optimized the response intervals for non-INVITE packets to 500 ms, 1s, 2s, 4s, 4s, 4s, which complies to the RFC3261.

    In the earlier version, the response intervals were 1s, 1s, 2s, 4s.

Call Control
  • Optimized Inbound Route: Added support for adding multiple DID patterns.
  • Optimized the Outbound Route template: Changed the parameter prpend to prepend.
  • Fixed the Call Permission issue: After upgrading the system firmware, the Call Permission rules which were deleted previously would be restored.
  • Fixed the Inbound Route issue: The system failed to match the correct inbound route if the DID pattern contained a special character +.
Call Features
  • Fixed the Conference issue: Inviting users to a conference would fail.
  • Fixed the Call Transfer issue: The Attended Transfer Caller ID setting (Settings > PBX > General > Preferences) didn't take effect.
  • Added support for compatibility with Yealink Call Recording feature.

    You can set the Type of DSS key to Record, and press the DSS key to start or stop call recording during a call.

  • Fixed the Call Transfer issue: Dialling *3 during a call to transfer the call would fail.
Network Drive
  • Optimized Network Drive: Added support for mounting a subdirectory of the shared folder.

    Example: The shared folder yeastar has a subdirectory recording . To mount the recording folder to PBX, you need to set the Share Name to yeastar/recording.

Multisite Interconnect
  • Fixed the Multisite Interconnect issue: Incorrect caller ID was displayed on the branch office side when a user reached the IVR of headquarter, and called the extension of branch office.
  • Optimized System Email: Added support for compability with the US Mikopia SMTP server.
System Log
  • Optimized System Log: Added support for recording the timestamp of system logs.

    Note: Go to Maintenance > System Log > System Log Settings, select the checkbox of Time Log, the timestamp will be recorded.
  • Optimized System Log: Added support for recording the DTMF logs.

    Note: Go to Maintenance > System Log > System Log Settings, select the checkbox of DTMF, the DTMF information will be recorded.
Call Recording
  • Fixed the recording issue: When users called in a queue, the system would generate two recording logs.
  • Fixed the Call Recording issue: When a queue agent answered a call and transferred the call, the system generated an incorrect recording log.
  • Fixed the CDR issue: When a user called in a queue and disconnected the call, PBX didn't generate a CDR for the call.
  • Fixed the CDR issue: The recording files that were selected on the web page were not all downloaded.
  • Accelerated the API response.
  • Fixed the issue of extension/update endpoint: Configure the parameter selectroute to a null value could not take effect.
Auto Provisioning
  • Fixed the issue of Yeastar TA Gateway: The option list of IAX Audio Codes displayed incorrectly.
  • Optimized Cisco SPA Phones: Added support for a maximum of 255 characters in Dictionary Server Script field.
    Note: In the earlier version, the maximum length allowed is 63.
Linkus Server

This version updates the following, you need to simultaneously upgrade Linkus clients to the latest version (iOS version: 2.9.10; Android version: 2.9.6), or Linkus may not work.

  • Added compatibility with PBX Contacts feature.
  • Optimized Linkus iOS Push.
Billing System
  • Fixed the billing issue: The Hangup with Insufficient Balance was enabled, but the system didn't hang up the call when the extension or account had insufficient balance.
  • Fixed the CDR issue: The data in CSV file that was downloaded from web page was incorrect.
  • Fixed the CDR issue: After filtering call logs, the Extension column was not displayed on the web page.
Zoho Integration
  • The Zoho Integration App is free, no more license from Yeastar is needed.
QueueMetrics Integration
  • Fixed the issue that QueueMetrics Integration App would be disabled automatically.