Grandstream GRP26xx, GXP and WP8xx — setting up for our PBX

Grandstream is the second most common brand of desk SIP phones after Yealink. The current line is GRP26xx: the affordable GRP2601/2602 for a counter or a back office, the colour-screen GRP2612/2613/2614, the larger GRP2615/2616/2624/2634 with speed-dial keys, and the touchscreen GRP2650/2670. Many venues also run GXP16xx and GXP21xx — the previous generation, configured the same way in principle, but with differently named web UI sections. A separate branch is WP810/WP820/WP822/WP825: these are not desk phones but Wi-Fi handsets — no cable, and they get their IP address over Wi-Fi.

Everything that is the same for all brands — credentials, ports, network and when a reset is needed — is covered in the overview “Setting up SIP phones”. This page only covers what to press on a Grandstream.

Two quirks of this brand cause most of the confusion:

• new GRP phones may have no admin/admin factory password — the password is printed on the label on the unit, and if the label is gone, you log in with the “Login from LCD” button (step 2);
• a new account is disabled out of the box: Account Active is set to No, so a line with perfectly correct credentials will not come up until you switch it to Yes (step 3).

What you will need#

• Extension credentials from the admin panel: the “Extension credentials” dialog (Telephony → Operators → “Reset password” on the operator, or right when you create one) — SIP server, Extension number, Login, Password, Port, Transport. Details are in the overview.
• The phone powered on and plugged into the staff network of the venue (not the guest Wi-Fi). Power comes from PoE or a power supply: on GRP26xx only models with a P or G in the name have PoE, while GXP1628/GXP1630 and all GXP21xx have it built in.
• For WP8xx handsets — a charged handset and the venue Wi-Fi (SSID and password); they have no cable.
• A computer or laptop on the same network with any browser.
• The phone itself in front of you: the web UI password of a new GRP is printed on the label on the unit, and the “Login from LCD” method requires pressing keys on the phone.

Step 1. Find the phone’s IP address#

Wait for the phone to boot and, on the idle screen, press and hold the navigation “up” key for 3 seconds — the phone will show its IP address, address mode, MAC address and firmware version.

The same address is always in the menu: Menu → Status → Network Status, the IPv4 Address line. The diagram below shows where that item sits in the GRP26xx menu (and, incidentally, where System → Factory Reset is — you will need it at the end).

Illustration: GRP261x/GRP262x/GRP263x Series — Administration Guide, “Configuration via Keypad” (documentation.grandstream.com).

Differences between families:

• GXP1610–GXP1630 — menu only: Menu → Status → Network Status.
• GXP2130–GXP2170 — press the “up” key on the idle screen, or Menu → Status → Network Status.
• WP810/WP820/WP822/WP825 — unlock the handset, press the middle soft key Menu (or OK), move to the Status icon and open Network Status.

An address of 0.0.0.0 or an empty line means the phone did not get an address: check the cable (the LAN/Internet socket on the phone, not PC) and that DHCP is served on the network; for a WP handset, that it is connected to Wi-Fi.

Step 2. Log in to the web interface#

Open a browser on your computer and enter the phone’s IP — for example http://192.168.40.154. A login page with your model name appears.

Screenshot: GRP261x/GRP262x/GRP263x Series — Administration Guide, “Accessing the Web UI via LCD” (documentation.grandstream.com).

If the password does not work or the label is gone, GRP26xx has a built-in way around it that only requires you to hold the phone:

1. On the login page click “Login From LCD” — the browser shows a one-time access code.
2. Type that code on the phone keypad, at the prompt that appears on its screen.
3. Choose AdminLogin on the phone screen and confirm — the browser logs in with administrator rights.

The vendor suggests the same method for the very first login and after a factory reset. The second, restricted user account is disabled by default — you could not configure an account through it anyway, so log in as admin.

Once inside, set your own password right away: Maintenance → Web Access → Admin Password. A forgotten administrator password cannot be recovered — only a factory reset helps.

Step 3. Enter the PBX credentials#

In the web interface open the Accounts tab, pick Account 1 → General Settings on the left and fill in the fields from the “Extension credentials” dialog:

Screenshot: GRP261X BroadWorks SCA Configuration Guide, “Configure Primary Phone Account Settings” (documentation.grandstream.com).

Click Save and Apply at the bottom of the page. No reboot is needed: settings on the Accounts tab take effect immediately.

SIP User ID and SIP Authentication ID get the same value — the full login, including the sip- prefix. A short extension number (“101”) in those fields is the most common reason registration is refused.

Step 4. Verify registration#

• On the phone. Menu → Status → Account Status lists the lines and their state; a registered line shows Registered. On the idle screen the line label becomes active, and on models with line keys the indicator lights up.
• In the phone’s web UI. The Status → Account Status tab: the SIP Registration column should show registration for your line, with SIP User ID and SIP Server next to it — handy for checking that what you typed is what you meant.
• In the admin panel. Telephony → Operators: the operator gets a green dot, with the time of last activity and the string the phone used to introduce itself (for example Grandstream GRP2612 124.86.0.130). The status refreshes at most once a minute.
• A call. Dial a colleague’s extension. If the call goes through but only one side can be heard, that is not registration but the media stream: turn off SIP ALG on the router (see the overview).

Factory reset#

A reset wipes everything: accounts, network settings (static IP, VLAN), the web UI password, language, the directory and call history. The firmware stays. You need it if the phone came with someone else’s settings (especially another provider’s provisioning server address — such a unit overwrites your account after every reboot), if the administrator password is lost, or if the phone behaves oddly after experiments.

From the phone menu (GRP26xx): Menu → System → Operations – Factory Reset → answer the warning with the Yes soft key. The phone reboots.

Screenshot: GRP261x/GRP262x/GRP263x Series — Administration Guide, “Restore Factory Settings Using the LCD Menu” (documentation.grandstream.com).

From the phone when the menu will not let you in (GRP26xx and GXP21xx): while the phone is booting, press and hold 1 + 9. A GRP26xx shows a recovery menu with two items — Factory Reset and Rollback Firmware; pick the first and confirm with the Submit soft key. A GXP21xx asks for confirmation with the # key and, if the administrator restricted menu access, for the administrator password.

From the browser:

• GRP26xx — Maintenance → Tools → Factory Reset → Start. The same page has Ping and Traceroute run from the phone itself: the best way to prove the problem is the venue network rather than the PBX.

Screenshot: GRP261x/GRP262x/GRP263x Series — Administration Guide, “GRP261X/GRP2624/GRP263x/GRP2670/GRP2650 Tools” (documentation.grandstream.com).

• GXP16xx — the Factory Reset button in the top right corner of the web UI.
• GXP21xx — the reset link in the top right corner, or the button at the bottom of Maintenance → Upgrade.
• WP810/WP820/WP822/WP825 — Maintenance → Tools → Factory Reset → Start, then confirm with OK.

On WP8xx handsets, from the handset: Settings → Advanced Settings → Factory reset, confirmed with the left soft key.

On GXP16xx from the phone menu: Menu → System → Factory Reset → confirm with the OK soft key.

After a reset: language, time zone, network if needed (or Wi-Fi on a WP) — then steps 2 and 3 again with the credentials from the admin panel. Web UI access will once more go through “Login From LCD” or the label password.

To simply reboot a GRP26xx without a reset: on the idle screen press HOLD together with the left navigation key, then confirm. HOLD + right does something else — it triggers a configuration request to the provisioning server.

If the phone does not register#

In order, from common to rare:

1. Account Active is still No. The signature Grandstream trap: the fields are right but the line is off. Accounts → Account 1 → General Settings → Account Active: Yes → Save and Apply.
2. The login is not complete. SIP User ID and SIP Authentication ID must contain sip-…-<number>, not “101”. Check both fields — they are easy to mix up.
3. The password is stale. If somebody pressed “Reset password” in the admin panel, the old one no longer works. Do not guess — issue a new one and retype it into SIP Authentication Password (the field always shows up empty, that is normal).
4. The server address is wrong. Copy SIP Server from the “Extension credentials” dialog: a venue with a dedicated PBX machine has its own address, not the shared sip.<domain>.
5. SIP Transport was changed. Account 1 → SIP Settings → Basic Settings → SIP Transport must be UDP. Our credentials assume UDP; the platform does not offer TLS at all, and a phone set to TLS will stay silent without a single error.
6. The network. Check from the phone itself: Maintenance → Tools → Ping the server address. No ping — a question for the venue network (router, VLAN, firewall, SIP ALG); ping works but no registration — a question for the credentials.
7. Settings “change by themselves” after a reboot — the phone pulls the previous owner’s configuration from a provisioning server: clear Maintenance → Upgrade and Provisioning → Config Server Path or do a factory reset.

Models in the family#

The web UI and the account field names are identical across the GRP26xx line; GXP16xx and GXP21xx differ only in where the sections live, the fields are named the same. A P in the name means built-in PoE, G means gigabit ports, W means Wi-Fi.

Frequently asked questions#

It will not let me into the web interface: admin/admin does not work#

New GRP26xx units may have no admin factory password — a random password printed on the unit label is used instead. Label gone? Click “Login From LCD” on the login page: the browser shows a one-time code, type it on the phone and choose AdminLogin. On GXP16xx and GXP21xx the login is the usual admin/admin, but the phone will immediately require a new password.

I filled in every field, and the phone still says the account is not registered#

Open Accounts → Account 1 → General Settings and check Account Active: the factory value is No, and a line with correct credentials will not come up. The second most common cause is a short extension number in SIP User ID instead of the full sip-…-<number> login.

How do I tell whether the phone cannot see the PBX or the PBX refuses it?#

From the phone itself: Maintenance → Tools → Ping the server address from the “Extension credentials” dialog. No ping — a question for the venue network (router, VLAN, firewall). Ping works but no registration — a question for the credentials: login, password, port, transport.

Is an older GXP configured the same way as a GRP?#

In principle yes: the same SIP Server, SIP User ID, Authenticate ID, Password, and the same “activate the account first” rule. The differences are where the web UI sections live, and that a GXP has a normal factory login (admin/admin) with no “Login From LCD”.

Can I set up a Grandstream with the QR code from the admin panel?#

No. The QR code in the “Extension credentials” dialog is only understood by the Zoiper and Linphone softphones. A desk phone is configured with fields; the “Copy all settings” button gives you all of them as one block of text, handy to keep in front of you while typing.

The Grandstream is connected, but audio goes only one way#

Registration has nothing to do with it: audio travels as a separate stream over UDP 10000–20000. SIP ALG on the router is almost always to blame — turn it off. If the phone and the PBX are on different networks, Accounts → Account 1 → Network Settings → NAT Traversal: Keep-Alive helps.

Can two extensions live on one phone?#

Yes, if the model has more than one line: fill in Account 2 the same way as Account 1 — a GRP2612 has four, a GRP2615 ten, a GXP2170 twelve. The GRP2601/2602 and GXP1610 have two.

Sources#

• GRP261x/GRP262x/GRP263x/GRP2670/GRP2650 Series — Administration Guide (web UI access and the factory password table, “Login from LCD”, Accounts → General Settings, Account Active defaulting to No, SIP Transport, Preferred Vocoder, Send DTMF, NAT Traversal, Maintenance → Tools, reset from the menu and with the 1+9 combination) — https://documentation.grandstream.com/knowledge-base/grp261x-grp262x-grp263x-series-administration-guide/
• GRP261x/GRP262x/GRP263x/GRP2670/GRP2650 Series — User Guide (IP address with a long press of “up”, Menu → Status → Network Status and Account Status, the menu map) — https://documentation.grandstream.com/knowledge-base/grp261x-grp262x-grp263x-series-user-guide/
• GRP260x Series — Administration Guide (GRP2601/2602/2603/2604: factory passwords, model specifications) — https://documentation.grandstream.com/knowledge-base/grp260x-series-administration-guide/
• GXP16xx Series — Administration Guide (admin/admin login with a mandatory password change, Menu → Status → Network Status, reset from the menu and with the web UI button) — https://documentation.grandstream.com/knowledge-base/gxp16xx-series-administration-guide/
• GXP21xx Series — Administration Guide (admin/admin login, IP with the “up” key, three reset methods, GXP2130–GXP2170 specifications) — https://documentation.grandstream.com/knowledge-base/gxp21xx-series-administration-guide/
• WP8xx — Administration Guide (WP810/WP822/WP825: administrator password on the label on the back, Status → Network Status, reset via Settings → Advanced Settings and Maintenance → Tools) — https://documentation.grandstream.com/knowledge-base/wp8xx-administration-guide/
• WP820 — Administration Guide (admin/admin login, Network Status, reset) — https://documentation.grandstream.com/knowledge-base/wp820-administration-guide/
• GRP261X BroadWorks SCA Configuration Guide (screenshot of the Accounts → General Settings page) — https://documentation.grandstream.com/knowledge-base/broadworks-sca-configuration-guide/
• GRP26xx — Auto-configuration “Plug and Play” Guide (DHCP option 66, cfg<MAC>.xml, GAPS) — https://documentation.grandstream.com/knowledge-base/grp26xx-auto-configuration-plug-and-play-guide/
• Source registry of the catalogue: docs/phone-knowledge/sources/grandstream.json