ESI phones — the ESI 60, 40, 30D, 48-key, and 24-key models used with ESI's Communications Server phone systems — don't come with a headset button active out of the box. Before your headset will work, you need to program one of the phone's unused feature keys to act as the headset button. Here's exactly how, plus what to do if it doesn't work as expected.
Quick answer
Last updated July 2026
Why you need to program a headset key
Like several other business phone brands, ESI phones ship with headset support built in, but no feature key assigned to it by default. Plug in a corded headset and you'll hear nothing, because there's no button yet telling the phone to route audio to the headset instead of the handset. Programming a key is a one-time, 30-second fix — once it's done, you don't need to repeat it.
Myth
My new headset must be defective since it's plugged into my ESI phone but there's no audio.Reality
It's almost never the headset. ESI phones don't activate a headset key automatically — you have to program one of the phone's free feature keys yourself. Until that's done, a plugged-in headset stays silent, which understandably looks like a hardware fault but isn't.How to program the headset button
There are two ways to program a feature key on your ESI phone. Either works; use whichever you find easier.
Method 1: Direct programming
- Choose an unused key on the phone.
- Press and hold that key down for at least two seconds. This immediately puts the phone into programming mode for that specific key.
- Enter the headset button code: 564.
Method 2: Traditional programming
- Press PROG/HELP on the phone.
- The Verbal Help Guide speaks the full programming menu aloud, walking you through the available options step by step.
- Follow the prompts to select your chosen key, then enter the headset button code: 564.
Once the code is entered, that key becomes your dedicated headset button — press it to route a call to your headset instead of the handset.
Which ESI phones does this apply to?
This programming procedure applies to the ESI 60, 40, 30D, 48-key, and 24-key phone models. If you're on a different ESI model and the same steps don't work, it's worth confirming your exact phone model with our team before troubleshooting further.
Why doesn't my headset work on my ESI phone?
ESI phones don't have an active headset key by default — you need to program one of the phone's unused feature keys to route calls to the headset. Until that's done, a plugged-in headset produces no audio, which isn't a sign of a defective headset.
How do I set up a headset button on an ESI phone?
Select an unused key, either by holding it down for two seconds (direct programming) or via PROG/HELP (traditional programming with the Verbal Help Guide), then enter the code 564. This applies to the ESI 60, 40, 30D, 48-key, and 24-key phones.
What is the headset button code for ESI phones?
The code is 564. Enter it after selecting the key you want to program as your headset button on ESI 60, 40, 30D, 48-key, or 24-key phones.
Do I need to reprogram the headset button every time I use a headset?
No. Programming the headset key is a one-time setup. Once a key is assigned using the code 564, it stays active — you only need to press it each time you want to use the headset for a call.
Programming the headset key is the entire trick with an ESI phone — once it's set, using a headset is as simple as pressing that button. For help choosing a compatible headset for your ESI phone, call our team at 877-999-3838.
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