Latest Firmware

Firmware Release Notes

Version 2.20.86 (1st December 2022)
  • Fixed issue which would cause specific cellular modems to not power up correctly on some ViAs
  • Fixed issue where the use of certain SIM cards could cause the codec to crash
Version 2.20.84 (22nd November 2022)
  • Added support for D-link DWM-222 H/W ver A2 LTE modem
  • Fixed issue where ViA would change the algorithm when editing the dialling number
  • Fix for Huawei E3372 detection
  • Added shut-down procedure for all current internal modems (Telit, Sierra, Quectel)
Version 2.20.68 (14th Nov 2021)
  • Fixed Tielink related issue which could lead to a crash during some disconnection events
  • Prevent jitter buffer bloating on bursty networks
  • Workaround for Luci compatibility
  • Improved audio ramp-up delay on all inputs
  • Improved compressor soft knee performance
  • Added support for revision 5 audio board
  • Fix for ZTE MF821 USB modem
  • SIP changes for improved PBX compatibility
  • Fix for Tielink connection fail on WiFi and Cellulars immediately after boot
Version 2.20.60 (26th July 2021)
  • WebGUI 2.9.39
    • Fixed issue where WebGUI Connections panel would sometimes fail to show all SmartStream+ streams
    • Fixed issue where WebGUI Connections panel would occasionally fail to show the remote session port when switching from TieLink to direct IP mode
  • Fixed issue where SmartStream+ redundant streams would use default ports even though Remote Audio Port was set to non-default value
  • Fixed issue where custom mixes weren’t saved correctly with a newly created program
  • Fixed issue where custom mixes would not load correctly
  • Stability improvements
  • Warn before switching modes (i.e. TieLink/IP) on Connections screen
  • Fixed issue where SmartStream+ stream list would sometimes be truncated on ViA front-panel UI
Version 2.20.54 (20th May 2021)
  • Critical fix: to prevent excessive flash memory writes during TieLink contact status updates
  • TieLink stability improvements:
    • Auto reconnect
    • TieLink Fuse interfaces
    • Performance improvements
  • Fixed Opus Voice settings for compatibility with v2.18.xx releases
  • Other Improvements:
    • Stream reconnections with SmartStream PLUS
    • Improved RTP compatibility issue with 3rd party devices that use CSRC header
Version 2.20.48 (30th March 2021)
  • Web GUI 2.9.37
    • Improvements to input names on mix editor panel
  • Improvements:
    • DTMF tones when mixed onto Encode 1
    • Custom APN authentication and Vodafone 3G not showing in UK
    • Implemented Multitech Action Plan for AT&T 3G Sunset
    • Ensure that internal cellular modems have diversity antenna enabled
    • Added support for Vodafone K5161h USB modem
    • Enhancements to LE910C4-NF based modems
Version 2.20.44 (23rd March 2021)
  • New features:
    • Added support for default route/nameserver interface ordering (System Internet).
    • Support for generating DTMF tones (including option for dedicated F2 key).
  • Enhancements:
    • Huawei E3372-153 and 320 modems in the UK
    • ViA front-panel UI.
    • Improved error message when SIM card PIN change fails.
    • Internal modem detection if SIM card had PIN enabled.
    • TL4GDUALMULTI module.
    • Failover program with failback disabled.
    • Improvement to DHCP and static IP adress.
    • Alarm tone enable/disable.
    • Improved AAC decoder error handling.
    • Fixed issue where a bidirectional connection to a Bridge-IT which did not have AAC encode license would cause the connection to fail rather than reverting to a unidirectional connection.
    • Fixed WiFi related ping issue on LAN1 and LAN2 .
    • Fixed issue where additional answer connections would sometimes be created when editing programs in the WebGUI Connections panel.
    • Fixed issue where codec would show the wrong associations between redundant and primary SS+ streams.
    • Fixed issue where input polarity settings would be ignored.
Version 2.20.40 ( 20th Nov 2020)
  • Web GUI 2.9.36
    • Fixed issue where Alarm History showed alarms dates as 1 month ahead
  • Added SNMP access to output source status
  • Changed default TCP keepalive timeout to zero i.e. keepalive timeouts disabled
  • Added support for Huawei E3372h-608
  • Added support for Huawei E3372h-320
  • Improvements where power button press would sometimes not be detected
  • Bug fixes:
    • Fixed issue where SIP call with asymmetric algorithms would be rejected by answering codec
    • Fixed issue where SD card would sometimes not be detected and required re-insertion to resolve
    • Fixed issue where some USB cellular modems would not be detected properly when plugged in during an active connection
    • Fixed session data handling bug
    • Fixed issue where some SIP servers would not relay messages from SIP answerer due to extraneous User-Agent field
Version 2.20.30 (29th Sept 2020)
  • Tielink – various performance and stability improvements
  • SNMP bug fixes
  • Fix for analog phone mix
  • Added support for Multitech/Telit dual AT&T/Verizon firmware modules
  • Web GUI 2.9.35
    • Fixed issue where SS+ streams couldn’t be added for encode only connections
Version 2.20.24 (20th July 2020)
  • Fixed issue where codec would reboot multiple times if LAN2 is disabled.
  • Web GUI 2.9.33:
    • Fixed bug SS+ connections couldn’t be added on a failover connection.
    • Allow local and remote relay selection for “load custom matrix” rule.
    • Fixes for bonding and SS+ display issues.
    • Fix for sessionless failover.
    • File manager fixes.
    • Inputs panel gain increment fix.
  • File manager naming fix.
  • Reference level fixes.

Supported USB Modems

The following modems have been reported as working by Tieline and/or customers in various countries and regions. Cell phone network providers sometimes offer variations in modem hardware and software and how devices are recognized by the codec. This means that the same modem reported as working on a carrier in one country, may not work on a different carrier in a different country. 

We cannot guarantee that a modem not on this list will work reliably. 

Please see the more detailed modem list to find out which modems have been tested in your country


  1. DWM-222


  1. E152
  2. E153u-65
  3. E160
  4. E397
  5. E398
  6. E3256
  7. E3372h – 153
  8. E3372s – 153
  9. E3372h-320
  10. E3372h-607
  11. E3372h-608
  12. E3276s
  13. E8278
  14. E8372h-608
  15. E8372h-517
  16. MS2372h-517


  1. AirCard 320U
  2. AirCard 340U


  1. U620L


  1. UML295

Sierra Wireless

  1. 313U


  1. MF821
  2. MF8ZTE21

Discovered a working modem NOT on this list?

Help the Tieline Community by clicking the “New USB Modem” button below so we can keep the list up to date. 


Tech Notes


Getting Started

To perform a firmware upgrade of your codec you need to:

  1. Download the latest firmware to your PC from the GREEN Download button on this page.
  2. Connect your PC to your codec to open the Toolbox web-GUI for your codec.

The web-GUI is used to perform the firmware upgrade from within the Settings panel. (This process has been tested using Chrome and Firefox.)

Update Firmware using the HTML ToolBox Web-GUI:

  1. Disconnect all connections before attempting the firmware upgrade.
  2. Attach an Ethernet cable to the LAN1 port on the codec.
  3. Press the HOME button to return to the Home screen, then tap Settings.
  4. Tap to select Transport Interfaces and then tap LAN1 or LAN2.
  5. Tap to select Network Settings and view the IP address in your codec.
  6. Ensure your PC is connected to the same LAN.
  7. Open your web browser and type the IP address of your codec into the address bar of your browser, e.g. (the last digits are the private address details unique to your codec over a private LAN).
  8. Refresh the browser and the web-GUI application should launch automatically.
  9. When you open the Toolbox web-GUI an authentication dialog prompts you to enter a password to login. The first time you log in you can enter the default setting “password” and click the OK button.
  10. Click the Settings button at the top of the web-GUI screen if the Settings panel is not displayed.
  11. Click Firmware.
  12. Click Update from a selected file and click the Select File button.
  13. Select the .bin file you have downloaded to perform the upgrade and click Open.
  14. Press the Update Firmware button to commence the upgrade.

We recommend clearing your browser cache after the upgrade is complete when using the HTML5 Toolbox web-browser GUI to control codec functions. The short cuts for this are:

  • Google Chrome: shift+Ctrl+delete
  • Mozilla Firefox: Ctrl+shift+delete
  • Internet Explorer: Ctrl+shift+delete
  • Safari: Ctrl+alt+e

Updating Using an SD Card (ViA, Bridge-IT, Gateway and Gateway 4 codecs) or a USB Stick (Genie, Merlin): requires firmware v2.16.xx or higher

  1. Insert an SD card with the latest firmware into the SD card slot on the rear panel of the codec.
  2. Press the HOME button to return to the Home screen, then tap Settings.
  3. Swipe up and tap to expand the About & Firmware menu, then tap Firmware. Note: A single partition FAT32 formatted SD card must be used.
  4. Navigate to the firmware file on the SD card, then press the OK button.
  5. Tap to confirm and commence the firmware upgrade. Update progress is displayed. IMPORTANT: The codec will reboot automatically after the firmware upgrade. DO NOT remove power or reboot the codec before the update has completed and the codec has rebooted itself.
  1. Check if there is a SIM lock on the modem that requires a PIN code. This can be disabled in the codec via Settings > Cellular > Select USB Modem/Cellular Module > SIM Pin, or by putting the modem’s SIM card into a phone and turning this setting off. Consult your mobile carrier for these instructions.
  2. Check if your modem is set to automatically connect. This is usually done through a software client setting on a laptop/desktop computer. Configure the modem to manually connect instead. Consult your mobile carrier for instructions.
  3. Check with your carrier to see if different APN settings are needed based on using a pre-paid versus a post-paid mobile broadband account. Custom APN settings can be configured in the codec as required. 
  4. Ensure the authentication type is correctly configured.

A list of tested modems are available above click here

To connect the codec to a Wi-Fi network access point:

  1. Press the HOME button to return to the Home screen, then tap Settings.
  2. Tap to select Transport Interfaces and then tap Wi-Fi.
  3. Ensure the Wi-Fi State is Enabled and tap Rescan Access Points if the required Wi-Fi network is not populated in the access point list.
  4. Tap to select the Wi-Fi access point to which you are connecting.
  5. Tap to select the preferred Authentication Mode and then tap Password to enter the network password.
  6. Enter the password, then tap Done in the top right-hand corner of the TOUCH SCREEN.
  7. Tap Connect in the top right-hand corner of the TOUCH SCREEN to connect to the Wi-Fi network.
  8. Verify the Wi-Fi symbol is visible in the Status Bar to confirm the codec has connected to the Wi-Fi access point.

Important Note: ViA supports IEEE 802.11 a/b/g/n Wi-Fi with dual band connectivity (2.4 and 5 GHz). For increased security Tieline has implemented the WPA2-PSK authentication protocol because standard WEP encryption is less secure

  1. Attach a supported USB Modem to either USB PORT 1 or USB PORT 2 on the codec. When the modem is detected by the codec, the network symbol and signal strength is displayed in the Status Bar on the TOUCH SCREEN. Note: It may take up to 90 seconds for the modem to be detected by the codec and connect to the network.
  2. From the Home screen tap Settings > Transport Interfaces > Cellular > USB1/2 Modem to view cellular details.

Important Notes:

  • It may be necessary to manually add an Access Point Name (APN) if the codec cannot connect automatically to the network.
  • To safely remove a USB modem press the HOME button to return to the Home screen, then tap Settings > System > Safe Eject.

It may be necessary to add a custom access point number (APN) profile if a USB modem or cellular module does not connect to a cellular network. Often this is necessary when you are using different SIM cards in an unlocked USB modem. E.g. When using SIM cards from various carriers in different countries. It may also be necessary to enter a SIM PIN unlock code.

Up to 10 custom access point profiles can be added to the codec. Before configuring the custom access point you need to obtain the access point details from the cellular network provider; this is normally found on their website. Usually a Telco will list internet and MMS APN information and you need to enter the internet APN details in the codec, as well as the correct authentication type.

Entering a SIM PIN Unlock Code

  1. Press the HOME button to return to the Home screen, then tap Settings.
    Tap to select Transport Interfaces and then Cellular.
  2. Tap to select the device you are configuring.
  3. Tap to select SIM PIN.
  4. Enter the SIM PIN and tap Done.
  5. Tap Save in the top right-hand corner of the TOUCH SCREEN to apply new settings.

Add a Custom APN Profile

  1. Press the HOME button to return to the Home screen, then tap Settings.
  2. Tap to select Transport Interfaces and then Cellular.
  3. Tap Profiles to add a new APN profile.
  4. Tap to configure a profile with the custom APN settings.
  5. Tap Name to name the profile and then tap to enter each access point setting.
  6. Tap Save in the top right-hand corner of the TOUCH SCREEN when all settings are entered.

Select a Custom USB Modem Profile (APN)

  1. After adding the custom profile and APN, tap to select the interface you want to configure. (Navigate to Home screen > Settings > Cellular > Select a modem or module).
  2. Tap to toggle the On/Off button for Enable Data and Overwrite APN to enable these settings.
  3. Tap to select the APN profile you want to apply to the USB modem, or tap Done to keep the existing setting.
  4. Tap Save in the top right-hand corner of the TOUCH SCREEN to apply all settings.
  5. The USB modem should connect to the network.

Click to watch the short video about how to use File Playback on the ViA.

Click to watch the short video about how to record audio files with the ViA.

Management Information Base (MIB) files are required for SNMP applications to interact with your Tieline codec and interpret SNMP data. The codec supports SNMPv1 and SNMPv2 MIB protocols.

The required MIB files can be downloaded from the codec using the following link in a PC web browser connected to the same network as your codec:


Save the .zip file to your PC and import the contents into the MIB browser you use to manage SNMP-enabled network devices.

Important Note: The codec supports the attributes specified in the MIB-II standard.

Please verify that your SNMP software contains the required files as specified in

 RFC 1213

You can make IP connections to a different codec brand, e.g. Comrex, if the SIP protocol is used on codecs at both ends and the codec you are connecting to is EBU N/ACIP Tech 3326 compliant. You can start by configuring the most commonly used settings on both codecs as follows:

  • Profile mono
  • Bit rate 64k
  • Algorithm G.722
  • Session port 5060 UDP
  • Audio port 5004 UDP

On newer firmware versions of Bridge-IT, Merlin, and Genie codecs the SIP Interface needs to be enabled first. There are two options to configure this:

  1. Using the Toolbox HTML 5 GUI select  Transport > SIP Interfaces and select the Enable check-box, then click Save.
  2. Using the codec screen tap Settings > SIP > Interfaces > SIP1 or SIP2 and tap the On/Off button to turn it On.

Note: The codec user manual has more information on connecting using SIP and using SIP servers. Alternatively, for more info see the codec Compatibility document under Tech Notes on the Support page for your codec at

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