If your DuraFon handset is already at volume level 6 and still isn't loud enough, there's an internal service menu with additional audio adjustment that most users never see. Here are the three procedures — speaker output, secondary volume, and microphone sensitivity — with the exact key sequences.
Key takeaways
- Try the normal volume setting (up to 6) first — these procedures are for when that still isn't loud enough.
- On the Codec Out and Codec In scales, zero is loudest and 9 is quietest — the reverse of what most people assume.
- Speaker output (all models): Menu, *, *, # → Option 2 → 41.
- Secondary volume (4X and PRO only): Menu, *, *, # → Option 4, adjustable from -8 to +8.
- Microphone sensitivity (all models): Menu, *, *, # → Option 2 → 51.
Before you start
These procedures access an internal service menu, not the standard user settings. Two things worth doing first:
- Confirm you've already tried the normal volume control and set it to 6. These adjustments are only for when the standard maximum still isn't sufficient.
- Write down the current value before you change it. Since this is a service-level setting, noting the default gives you a way back if the new value sounds worse rather than better.
Myth
On the DuraFon Codec settings, a higher number means louder.Reality
It's the opposite. On both the Codec Out (speaker) and Codec In (microphone) tests, zero is the loudest setting and 9 is the quietest. Default values typically sit between 3 and 5. If you increase the number expecting more volume, you'll get less — so adjust downward toward zero to make it louder.Handset speaker output (DuraFon 1X, 4X, and PRO)
This is the main adjustment for making the earpiece louder:
- Press Menu, *, *, # (star, star, pound).
- Press Option 2 for "Boardtest."
- Press 41 to enter the "Codec Out" test.
- Note the digit in the bottom right corner — the default is typically between 3 and 5.
- Adjust the value. Remember: zero is loudest, 9 is quietest.
- Press End to finish, then End again to exit.
Secondary speaker volume (DuraFon 4X and PRO only)
The 4X and PRO have an additional volume adjustment the 1X doesn't:
- Press Menu, *, *, # (star, star, pound).
- Press Option 4 for "Vol Adjust."
- Use the up/down arrows to move between -8, -4, 0, +4, and +8.
- Here the scale runs the intuitive way: +8 is loudest, -8 is quietest, and the default is zero.
- Press the top left button to save.
- Press End three times to exit.
Microphone sensitivity (DuraFon 1X, 4X, and PRO)
If callers can't hear you clearly rather than the reverse, adjust the microphone instead:
- Press Menu, *, *, # (star, star, pound).
- Press Option 2 for "Boardtest."
- Press 51 to enter the "Codec In" test.
- Note the digit in the bottom right corner — the default is typically between 3 and 5.
- Adjust the value, again with zero loudest and 9 quietest.
- Press End to finish, then End again to exit.
How do I make my DuraFon handset louder than volume 6?
Enter the service menu with Menu, *, *, #, select Option 2 "Boardtest," then press 41 for the Codec Out test. Adjust the value in the bottom right corner — zero is loudest, 9 is quietest, with defaults typically between 3 and 5. Press End twice to save and exit.
Why did my DuraFon get quieter when I raised the number?
Because the Codec scale runs backwards from what you'd expect: zero is the loudest setting and 9 is the quietest. To increase volume, adjust the number downward toward zero.
How do I adjust the microphone if callers can't hear me?
Use the Codec In test rather than Codec Out: press Menu, *, *, #, then Option 2 "Boardtest," then 51. The value in the bottom right corner controls microphone sensitivity, with zero loudest and 9 quietest.
Does the DuraFon 1X have the secondary volume adjustment?
No. The Option 4 "Vol Adjust" setting (ranging from -8 to +8) is available on the DuraFon 4X and PRO only. The 1X has just the Codec Out adjustment under Option 2.
These adjustments solve most "still not loud enough" situations on a DuraFon system. If you've worked through them and the audio still isn't right, call our team at 877-999-3838 — and note your current Codec values before you call, since that tells us where you're starting from.
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