Last updated: September 2026
Yes — a GoHighLevel VoIP deskphone setup can connect a compatible physical office phone directly to HighLevel for inbound and outbound calls.
That means a business can use a traditional office handset for inbound and outbound calls while keeping call activity tied to the HighLevel CRM, including features such as call recording, call transfers, and call transcription when those features are enabled.
This guide walks through the full setup process, from choosing the right handset and preparing the office network to creating SIP credentials, assigning the phone to a HighLevel user, testing calls, transferring between extensions and troubleshooting common failures.
If you are still deciding whether to keep your current provider or migrate your business phone system, start with our pillar guide: How to Connect VoIP Phone Systems to GoHighLevel.
GoHighLevel VoIP deskphone setup with SIP phone and CRM call tracking
The deskphone is the user’s physical calling endpoint. HighLevel remains the phone and CRM environment managing the call.
Which Physical VoIP Phones Work With GoHighLevel?
HighLevel recommends using standard open-SIP phones that allow manual SIP account configuration. Its current documentation lists the following commonly used models:
This is not an exhaustive certification list. HighLevel states that most open-SIP devices can work when standard SIP registration is supported, although menus, firmware behaviour and configuration fields vary by manufacturer.
What You Need Before Starting
HighLevel SIP Deskphone Network Requirements
Many deskphone problems are actually network problems. HighLevel’s current deskphone documentation specifies the following requirements:
| Requirement | HighLevel Guidance | Why It Matters |
|---|---|---|
| SIP Transport | UDP, TCP or TLS | Allows the phone to register and signal calls. |
| SIP Signalling | Outbound 5060 / 5061 | Required for SIP signalling. |
| RTP Audio | UDP 10000–20000 | Carries call audio. |
| SIP ALG | Disable if it interferes | Can cause registration, answering or one-way audio issues. |
| Power | PoE or external adapter | Keeps the physical phone powered reliably. |
How to Connect a Physical VoIP Deskphone to GoHighLevel
View HighLevel’s current physical VoIP deskphone documentation.
Step 1: Open the HighLevel VoIP Deskphone Wizard
HighLevel’s current setup guide places the deskphone wizard under:
Interface labels can evolve, but the important point is to configure the SIP device inside the correct sub-account/location.
Step 2: Confirm the SIP Domain
HighLevel creates a SIP domain for the location. The handset uses that domain as its SIP registrar/server when it connects to HighLevel.
Step 3: Create the SIP User and Extension
Create an extension for the deskphone and use a strong password. Extensions also support deskphone-to-deskphone internal calling after multiple phones are configured.
For example, if two users have configured deskphones with extensions 101 and 102, the first user can dial 102 directly from the handset to reach the second deskphone.
Step 4: Assign the Deskphone to the Correct User
Each deskphone must be mapped to a HighLevel user. After assigning the device, make sure the user’s call-routing preferences actually include the deskphone.
Step 5: Enter the SIP Credentials Into the Physical Phone
The exact phone-side menu depends on the manufacturer and firmware, but most open-SIP handsets ask for roughly the same information.
| Phone Field | HighLevel Value | Possible Alternate Label |
|---|---|---|
| Registrar / Server | SIP Domain | SIP Server / Proxy / Domain |
| User ID | SIP Username / Extension | SIP User / Account / Auth ID |
| Password | HighLevel SIP Password | Auth Password / SIP Password |
Save the phone configuration and wait for the SIP account status to show Registered or the manufacturer’s equivalent.
Step 6: Use HighLevel’s Built-In Test Calls
HighLevel’s current deskphone tool includes simulated inbound and outbound tests.
After the built-in tests pass, also test a real inbound call from an outside phone, a real outbound call, two-way audio, caller ID, voicemail, extension dialing and any required transfer workflow.
Can HighLevel Deskphones Call Each Other by Extension?
Yes. HighLevel’s current deskphone documentation supports direct extension-to-extension calling between configured physical deskphones.
Ext. 101
Ext. 102
Can You Transfer Calls Between HighLevel Deskphones?
HighLevel currently supports blind transfers from one configured deskphone to another user’s extension.
Supported. Initiate the transfer from the handset and dial the destination extension.
Not currently supported from the physical deskphone according to HighLevel’s deskphone documentation.
SIP Endpoint vs. SIP Trunk: The Critical Difference
A physical deskphone registers directly to HighLevel using the SIP credentials created for that device.
HighLevel currently states that SIP trunking is not supported for connecting an existing PBX/Asterisk environment directly into HighLevel.
This distinction matters when migrating from providers such as VoIP.ms, Telnyx, a local PBX, 3CX or Asterisk. A SIP-capable phone may be reusable even when the old SIP trunk architecture is not.
Can You Reuse an Existing Yealink, Poly or Grandstream Phone?
Often, yes — if the handset is not locked to the old provider and supports manual SIP configuration.
Do not factory-reset a production phone until you have documented the existing configuration and confirmed that the device can be reprovisioned. If the phone is provider-managed, coordinate the release/unlock first.
HighLevel Deskphone Troubleshooting
| Problem | Likely Cause | What to Check |
|---|---|---|
| 401 / 403 Unauthorized | Incorrect credentials | Re-enter the username and password exactly; credentials are case-sensitive. |
| No audio | RTP blocked | Verify UDP 10000–20000 and review SIP ALG/firewall behaviour. |
| Phone rings but cannot answer properly | NAT / SIP ALG | Disable SIP ALG if it is interfering and confirm RTP traffic. |
| Outbound works, inbound fails | Routing or Keep Alive | Confirm user Deskphone routing and check the handset Keep Alive setting; HighLevel recommends Keep Alive Type = Options when relevant. |
| Built-in inbound test works, real calls do not | HighLevel call routing | Review number routing, assigned users, IVR/Voice AI, Ring All and Deskphone channel settings. |
| Phone stopped registering after password reset | Old password stored on handset | Update the physical phone with the new SIP password. |
How to Reset or Remove a HighLevel Deskphone
Use the VoIP Deskphone (SIP) device-management area and edit the device. After resetting the password, update the handset with the new credential.
Deleting the SIP device immediately unregisters the handset. Only do this when you intend to remove or reprovision the phone.
What Happens to Call Recording, Transcription and CRM Activity?
The major advantage of using a physical handset as a HighLevel endpoint is that the deskphone does not become a separate communication silo.
HighLevel states that CRM features such as call recording, transfers and transcription continue to work with connected physical deskphones when those features are enabled. Recordings can be reviewed through call reporting and the relevant contact conversation.
What About Voicemail on the Physical Phone?
A deskphone’s native voicemail button does not automatically become a shortcut into HighLevel voicemail. HighLevel voicemail is reviewed through the HighLevel environment, including Conversations and call reporting.
That distinction is important when replacing a traditional PBX where employees were accustomed to pressing a dedicated voicemail key on the handset.
Should You Use a Physical Deskphone or the HighLevel Web/Mobile App?
| Use Case | Physical Deskphone | Web / Mobile |
|---|---|---|
| Front desk / reception | Excellent | Good |
| Dedicated office workstation | Excellent | Excellent |
| Remote / mobile employee | Limited | Excellent |
| Traditional handset preference | Excellent | Moderate |
| Deskphone extension dialing | Supported between configured deskphones | Different calling workflow |
Many businesses use both. Reception or operations staff may prefer physical handsets, while salespeople and remote employees use the browser or mobile app.
Physical VoIP Deskphone Migration Checklist
GoHighLevel Physical Deskphone FAQs
Can I connect a Yealink deskphone to GoHighLevel?
Yes. HighLevel currently lists the Yealink T54W and T58W among commonly used models. Other open-SIP Yealink models may also work when standard SIP registration is supported.
Can I connect a Grandstream phone to HighLevel?
Yes. HighLevel lists the Grandstream GXP2170 as a commonly used model. The exact SIP menu varies by model and firmware.
Can two HighLevel deskphones use the same user?
HighLevel’s current deskphone FAQ states that two deskphones cannot point to the same HighLevel user. Plan one configured deskphone per user.
Can HighLevel deskphones dial extensions?
Yes. Configured physical deskphones can call each other directly by extension.
Can I perform a warm transfer from a HighLevel deskphone?
Not currently. HighLevel’s current deskphone documentation supports blind transfers between configured deskphones, but not warm transfers from the physical handset.
Does HighLevel support SIP trunking?
No. HighLevel’s current documentation explicitly states that SIP trunking is not supported for connecting an existing PBX/Asterisk system directly to HighLevel. Physical deskphones connect as individual SIP endpoints.
Why can I make outbound calls but not receive inbound calls?
Check the user’s Deskphone routing settings first. If those are correct, review the handset’s Keep Alive configuration, NAT/SIP ALG behaviour and the documented SIP/RTP network requirements.
Does using a deskphone add a separate HighLevel fee?
HighLevel’s current deskphone FAQ says there is no additional deskphone-specific charge; calls use the same applicable per-minute rates as web/mobile calling.
Turn Your Existing Deskphones Into Part of the CRM
A physical office phone does not have to remain disconnected from the CRM.
For businesses that still want a real handset at reception desks, offices, clinics, dealerships, professional-service firms or operations teams, HighLevel’s SIP deskphone support creates a practical bridge between traditional phone hardware and modern CRM automation.
LeadMagno can help determine whether your existing Yealink, Poly, Grandstream, Snom, Cisco or other SIP hardware can be reused, whether it should be replaced, and how the phone system should connect with call routing, Voice AI, CRM workflows and follow-up automation.