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Biamp Systems

Tesira HD-1 dialer

This article describes basic implementation of the Tesira HD-1 dialer. It is compatible with Tesira analog and VoIP dialer blocks in Tesira software / firmware versions 2.4 and later.

Network considerations

The HD-1 requires PoE. It is a standard Ethernet device. It is not an AVB device and does not require an AVB switch.

The default network configuration of HD-1 units is DHCP, so if there is no DHCP server on the Tesira network the units will revert to link local addressing (, netmask schemes. If the HD-1 and the Tesira servers are on the same subnet, the units should be discoverable in Device Maintenance.

Prior to being associated with a system the HD-1 will display "Waiting for Configuration..." on the screen. Once the Tesira server has a configuration file loaded to it the HD-1 will associate to it by Device ID. The HD-1 display will then update its status.

Up to 128 control devices can be used in a system with Tesira Server / Server-IO / TesiraFORTÉ. See Tesira Device Count Limits for further details. 

Device ID

To associate the HD-1 and a Tesira Server or TesiraFORTÉ, the HD-1 must be included in the configuration file and be assigned to a single phone line on a phone card. It can be either an analog or VoIP card.

The Device ID of the HD-1 is used to associate the block with the physical HD-1, it needs to be set in 2 places: the HD-1 processing block and in the HD-1 hardware.

Double-click on the HD-1 block to open it and edit the default Device ID as required. The default Device ID is HD-1ID 01, if additional HD-1 blocks are added to the configuration the last digit of the Device ID will increment by 1. 

The Device ID in the hardware is set via Device Maintenance > Remote Devices > HD-1 Properties (again, the default is HD-1ID 01). Use Copy and Paste to ensure that the Device ID within the HD-1 processing block exactly matches that which is assigned to the HD-1 hardware.

After the configuration has been pushed the HD-1 will be able to display its Device ID and network information locally by pressing the "Info" soft button.

In the same way that 2 or more TEC-1 with the same Device ID will mirror one another's state, 2 or more HD-1 can share the same Device ID and mirror call states. Dialing activity is only shown on the device being used to dial, once the number is sent each screen will show the call state.


The Tesira HD-1 has a single RJ-45 jack for connection to the Tesira control network. It requires PoE.

Each HD-1 supports a single phone line.

With a VoIP card the HD-1 can support 2 call instances, with up to 2 calls active and conferenced together.


HD-1 buttons.PNG

  • Volume control is associated with the Receive level of the telco input. It covers the full range of travel from -100dB to +12dB (112dB total range) in twenty equal steps of 4.8dB.
  • Mute control is done in the telco Transmit block, acting as a privacy feature. Incoming audio is not muted.
  • Speed dial numbers are assigned in the HD-1 block in Tesira software.

Network connections

HD-1 network.PNG

Associating DSP Blocks

The HD-1 must be associated with a specific telco card in the software. The HD-1 and telco card will then share an identification number seen at the bottom right corner of the blocks.

HD-1 blocks.png

The HD-1 block is not assignable to a telco interface that already has a dialer block associated. The desired interface is unavailable until the dialer block is removed. The following message will be displayed if no telco interfaces are available for association.


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