How to Factory Reset a Grandstream Phone or ATA (GRP, GXP, HT Series)

VoIP and UC deployments keep expanding, which means more endpoints to onboard, redeploy, recover, and support. The unified communications market was valued at $136.11B in 2023 and is projected to reach $417.86B by 2030 at a 17.4% CAGR (Grand View Research). The VoIP services market is forecast to reach $172.49B in 2025 and grow to $308.41B by 2030 (Mordor Intelligence).

The IP phone market is also expected to expand significantly through the next several years, with one estimate putting 2023 market size at $3.09B with strong growth to $7.36B by 2030 (Maximize Market Research).

The bottom line: as MSPs scale hosted VoIP and UCaaS services, factory resets become a routine operational task, especially when devices change tenants, get mis-provisioned, or arrive "dirty" from a previous deployment.

Quick Answer: How to Factory Reset a Grandstream Phone

• GRP260x phones: Menu > Settings > Advanced Settings > Factory Reset > Confirm.
• GRP261x / GRP2624 / GRP2634 phones: Menu > System > Operations - Factory Reset > Confirm.
• GXP21xx phones: Menu > System > Operations - Factory Reset (or use the boot key combo 1 + 9 during boot).
• GXP16xx phones: Menu > Config > Factory Reset > Confirm.
• HT801/HT802 ATA: Use the reset pinhole (press ~7 seconds) or IVR reset (*** then 99, then enter encoded MAC).

Before You Reset (Do This First)

A factory reset wipes settings and often triggers auto-provisioning again, so take 2 minutes to avoid a 2-hour mess.

Checkpoint Checklist (MSP-Friendly)

• Confirm the "why": Tenant change, provisioning loop, lost admin password, used device, wrong config, etc.
• Capture the device identity: Model + MAC address (photo the label).
• Document network details (if applicable): VLAN, static IP, gateway/DNS.
• Confirm provisioning sources: DHCP option 66/160, GDMS/TR-069, redirect service, or your hosted provisioning URL.
• Have SIP creds ready (if configuring manually): SIP user, auth ID, password, registrar, outbound proxy.

What "Factory Reset" Actually Does

A factory reset restores a device to default configuration and removes prior tenant settings. Grandstream's own documentation warns that restoring factory defaults deletes configuration and you should back up settings first. If you manage endpoints through a white-label VoIP platform, this is especially important because the phone will re-enter its provisioning cycle immediately after reset.

Step-by-Step: Factory Reset by Grandstream Device Family

1. Factory Reset Grandstream GRP260x Series (GRP2602, GRP2603, GRP2604, etc.)

Recommended method: phone menu

1. Press Menu.
2. Go to Settings > Advanced Settings.
3. Select Factory Reset.
4. Confirm Yes to proceed.

Shortcut method (when you need speed): GRP260x also supports a shortcut. Press and hold Softkey1 + Down until the factory reset confirmation appears.

Official doc: Grandstream GRP260x User Guide

2. Factory Reset Grandstream GRP261x / GRP2624 / GRP2634 Series

1. Press Menu.
2. Select System.
3. Select Operations - Factory Reset.
4. Confirm Yes to proceed (or No to cancel).

Official doc: Grandstream GRP261x/GRP262x/GRP263x User Guide

3. Factory Reset Grandstream GXP21xx Series (GXP2130/2140/2160/2170, etc.)

Option A: Reset from the phone menu

1. Press Menu.
2. Select System.
3. Select Operations - Factory Reset.

Option B: Hard reset using keypad during boot (useful if menus are locked)

Grandstream documents a hard reset method for GXP21xx:

1. Power cycle the phone.
2. When you see "booting," press and hold Key 1 + Key 9.
3. If prompted, enter the admin password.
4. Confirm factory reset when prompted.

Official doc: Grandstream GXP21xx User Guide

4. Factory Reset Grandstream GXP16xx Series (GXP1610/1615/1620/1625/1628, etc.)

1. Press Menu.
2. Select Config.
3. Select Factory Reset.
4. Confirm OK (or cancel).

Official doc: Grandstream GXP16xx User Guide

5. Factory Reset Grandstream HT801 / HT802 (ATA)

You have two common reset paths: physical reset (fastest) or IVR reset (best for remote hands).

Option A: Reset using the reset pinhole (recommended for most cases)

Grandstream's HT801/HT802 guide lists these steps:

1. Unplug the Ethernet cable.
2. Locate the reset hole on the back panel.
3. Insert a pin and press for about 7 seconds.
4. Remove the pin; the unit restores factory settings.

Option B: Reset using IVR (*** then 99, then encoded MAC)

From the HT801/HT802 administration guide:

1. Dial *** to access IVR.
2. Enter 99 and wait for the reset prompt.
3. Enter the encoded MAC address.
4. Wait ~15 seconds for reboot and restore.

MAC encoding mapping (A-F):

ATAs like the HT801/HT802 are commonly used in SIP trunking deployments and POTS replacement projects where you need to bridge analog devices to a modern VoIP platform. If you are deploying ATAs alongside IP phones, having a standardized reset and provisioning workflow is critical to keeping your operations clean.

Official docs:

• Grandstream HT801/HT802 User Guide
• Grandstream HT801/HT802 Administration Guide

Default Login Info After Reset

This is where many techs waste time. Here is what you need to know so you can get back into the web UI immediately after you factory reset a Grandstream phone or ATA.

GRP Series Default Admin Login

• Username: admin
• Password: Random password printed on the sticker (back of unit)

GRP phones will prompt you to change this after a factory reset (grandstream.com).

GXP Series Default Admin Login

• Username: admin
• Password: admin (grandstream.com)

HT801/HT802 Default Admin Password (Web UI)

• Password: admin

Grandstream documentation describes the HT801/HT802 admin password default as "admin."

MSP Gotchas: Why Your Grandstream "Keeps Coming Back" After a Reset

If you factory reset a Grandstream phone and the device immediately pulls old branding or accounts, you likely have auto-provisioning still active. This is the single most common reason a reset "does not work."

Common Causes

• DHCP option 66/160 pointing to a provisioning server
• A GDMS/TR-069 controller pushing a template
• A redirect or provisioning service tied to the device MAC

If You Manage Endpoints at Scale

Grandstream supports centralized management via TR-069, and notes that TR-069 enables a common platform for managing devices (grandstream.com). Grandstream's GDMS guidance also notes that TR-069 needs to be enabled for GDMS configurations to apply, and for supported devices it is often enabled by default (content.grandstream.com).

Scaling endpoint management is one of the operational challenges that separates MSPs who treat voice as a side offering from those who build it into a real revenue stream. If you are managing dozens or hundreds of Grandstream phones across multiple tenants, pairing standardized provisioning templates with a platform like ViiBE (which handles the quoting, billing, and provisioning lifecycle) keeps your device operations and your revenue operations aligned.

Practical Workflow

1. Remove or disable the provisioning assignment for the MAC.
2. Factory reset the device.
3. Re-provision cleanly to the new customer profile or template.

For MSPs deploying Yealink alongside Grandstream, our Yealink T54W setup guide follows the same provisioning-first philosophy and is worth bookmarking as a companion reference.

Troubleshooting: Factory Reset Not Working

Symptom: Reset option is missing or locked

• Try the boot key combo on GXP21xx (1 + 9 during boot).
• You may need the admin password if the phone is in restricted keypad mode.

Symptom: HT801/802 will not reset

• Use the pinhole reset method and press for ~7 seconds.
• If remote: use IVR reset (*** then 99 and encoded MAC).

Symptom: Phone resets but comes back with old settings

• You are not dealing with a "phone problem." You are dealing with a provisioning source (DHCP/TR-069/redirect). See the "MSP Gotchas" section above.

Symptom: Phone registers but calls drop, produce one-way audio, or have choppy quality

• This is usually a network issue, not a Grandstream config issue. Check your firewall for SIP ALG interference. If you are running Ubiquiti gear, see our UniFi and EdgeRouter QoS guide. If you are on Sophos, see our Sophos Firewall VoIP configuration guide. If you are on Meraki, see our Meraki firewall VoIP guide.

Factory Reset a Grandstream Phone the Right Way and Scale Your Voice Practice

Factory resets solve immediate endpoint problems. But if you find yourself resetting phones constantly because of provisioning loops, inconsistent templates, or billing mismatches between what was sold and what was deployed, the real issue is not the phone. It is the workflow behind it.

Scalable MSP voice operations require standardized provisioning, clean templates, and repeatable deployments that connect device management to your quoting and billing lifecycle. Whether you are managing a fleet of Grandstream GRP phones, Yealink T54Ws, or HT-series ATAs paired with SIP trunks, the goal is the same: every device deployed correctly the first time, every customer billed accurately, and every change tracked without manual effort.

Viirtue's ViiBE platform is designed for MSPs and resellers that want to own the customer relationship while scaling quoting-to-billing automation on a wholesale VoIP platform. If you are building a serious voice practice, become a Viirtue partner and see how the platform handles the full revenue lifecycle from first quote to collected payment.