The PTT page can be used to configure talk groups (Multicast Groups) and speaker/mic settings for PTT
enabled radios. Radios will only communicate with other radios that are subscribed to the same ‘Multicast
Group’. Radios can be active in multiple talk groups.
Multicast Group – Input the IP address of the multicast group. Radios will only communicate to radios
within the same group. There are three different modes to select which dictate how a radio behaves
within a group:
• Active: Radio may send and receive PTT audio on this group.
• Inactive: Group is disabled, no PTT audio will be sent or received.
• Monitor: Radio may listen to PTT audio from other users on this group, but may not talk.
Mic Type – Supported MIC types are Moving Coil or Condenser. The input amplification is adjusted based
on the Mic Type chosen on this page
Mic Bias Voltage – Options are 90% (3V) or 65% (2.15V).
Audio Encoder Type – Default option is ‘Variable Rate Code (OPUS)’. ‘G.722 (high quality)’ and ‘G.711’ are
also supported for backwards compatibility
Speaker Volume – Moving slider adjusts the gain on the speaker
Mic Volume – Moving slider adjusts the gain on the microphone
Beep Volume + PTT Override – When the PTT button is pressed while another user is speaking, a warning
beep will be played. This setting controls the volume of the Beep as a percent (%) of the speaker volume
above. Pressing the PTT button three times (and holding on the third) within 1s will allow a user to override
the channel and speak.
PTT Aggregation Delay – Lower values will have lower latency and higher values will have higher
efficiency. Measured in milliseconds.
Dual PTT/COS – This allows Dual PTT functionality for some mic handsets to talk on two talk groups at the
same time. COS is to allow ROIP functionality.
PTT HQ Link Notifications – When the PTT button is pressed twice within 1s, an audio notification will
read out the SNR level to the user-specified HQ node. If the level transitions option is enabled, the
notification will be played automatically when the SNR crosses the specified thresholds. The SNR
thresholds can be set by first choosing the number of levels desired, and then moving the sliders
accordingly.
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