Configure Your Adapter

BYO (bring your own) ATA? A few more steps and your vintage phone is alive. These screen shots are a Grandstream HT802 (V2) — other Grandstream models look almost identical. The first three steps get you on the network; the last four are optional tweaks for rotary, candlestick, and crisper audio.

Get your line's settings

In your White Pages, each of your Local Lines shows a SIP Info box with three things you'll copy into the adapter:

Server — your Exchange address (app.pots-box.org)
User ID — this line's generated username
Password — this line's generated password

Screenshot it, or keep the tab open — you'll paste these next.

POTSBox White Pages showing a line's Server IP, User ID, and Password

Point the adapter at your Exchange

First, two things you'll need to open the adapter:

The adapter's address. On a Touch-Tone phone, pick up and dial * * * (a voice menu starts), then 0 2 — the voice reads you the IP. Type it into your browser. (On a pulse-only rotary phone this won't work; find the adapter in your router's device list instead.)
The login. Username is admin; the password is printed on the sticker on the bottom of your adapter.

Once you're in, go to Port Settings → FXS PORT1 → General Settings. Under Account Registration:

Tick Account Active
Primary SIP Server ← your Server IP from Step 1

Don't leave the page yet — the User ID and Password go on this same screen, coming up next.

Grandstream HT802 General Settings with Account Active ticked and Primary SIP Server filled in

Enter your User ID, Password & Name

Still on General Settings, scroll down and fill in the rest from Step 1:

SIP User ID and SIP Authenticate ID ← your User ID (the same value in both)
SIP Authentication Password ← your Password
Name ← whatever you want as this phone's caller-ID name (e.g. Living Room)

Then Save and Apply. Back in your White Pages the line flips from Unregistered to Registered — you're on the network, and your vintage phone can already make and take calls.

That's everything you need. The next three steps are optional polish — take only the ones that fit your phone.

Grandstream HT802 General Settings showing SIP User ID, Authenticate ID, Authentication Password, and Name fields

Rotary phone? Turn on pulse dialing

A rotary dial doesn't send tones — it sends clicks. Open the Analog Signal Line Configuration tab and tick Enable Pulse Dialing so those clicks register as digits. Now your 1940s dial works exactly as it did.

Touch-Tone (push-button) phones don't need this — skip just this step and continue.

Grandstream Analog Signal Line Configuration with Enable Pulse Dialing checked

Turn up the volume: RX Gain

Vintage handsets can sound faint. Worth doing on any phone. Still on the Analog Signal Line Configuration tab, find Gain and set RX to +6dB. RX is your receiver volume — the loudness in your ear — so this brings callers up nice and clear. (Leave TX at 0dB unless people say you're too quiet on their end.)

Grandstream Analog Signal Line Configuration with Gain RX set to +6dB

Crisper audio: line echo canceller

Also worth doing on any phone, and it's right below the Gain setting. Still under Analog Signal Line Configuration, tick Enable Line Echo Canceller (LEC). It strips the faint echo of your own voice off the line, so both sides come through clean.

Grandstream Analog Signal Line Configuration with Enable Line Echo Canceller checked

No dial at all? Use Auto-Dial

Got a dial-less candlestick — nothing to dial? This is the magic trick. Under Call Settings → Dial Setting, set Off-hook Auto Dial to 0. Now the moment you lift the receiver, it calls the Operator — she answers and connects you, no dialing required.

It's exactly how a phone worked in 1910: pick up, and the operator is there. The newest plumbing, restoring the oldest romance.

Grandstream Call Settings with Off-hook Auto Dial set to 0