VoIP Deskphones (SIP endpoints)
What is the VoIP Deskphone integration?
The VoIP Deskphone feature lets you register any SIP-compatible hard-phone (deskphone) to your account. All calls placed or received on the handset flow through your account, so you keep call tracking, recordings and automations in one place.
Requirements & recommended deskphones
Network & protocol
SIP over UDP, TCP or TLS
Outbound ports 5060/5061 open for SIP
UDP 10000-20000 open for RTP audio
PoE or external power
When buying new hardware
Look for the terms “SIP”, “PoE” and at least two programmable line keys
Avoid phones locked to a single carrier or that require proprietary provisioning codes
Popular models
Yealink T54W / T58W
Poly VVX 450
Grandstream GXP 2170
Snom D785
Cisco 7841
(Any open-SIP handset should work, these are just proven examples.)
Step-by-step setup
Go to account Settings → Phone System → Advances Settings → VoIP Deskphone (SIP) → Get Started.
Confirm or edit your SIP Domain.
A default suggestion appears as <LocationName>.sip.ashburn.twilio.com.
You can change it once before saving.
Setup an Extension or a Username (number or text) and a password. Keep these handy, you'll need it when setting up your phone.
Link a user (one deskphone per user). If needed, create the user first.
Click Save.
On your deskphone, paste those three values into the matching fields (often named Registrar, Server or Proxy, plus Username and Password).
(Optional) Outbound Test Call – Dial the on-screen number; you’ll hear “This is a test call” three times if successful.
(Optional) Inbound Test Call – Click the button; your phone should ring. Answer and hang up to confirm audio.
If either test fails, click Details for error codes or choose Contact Support.
Managing deskphones
Reset a password: Account Settings → Phone System → Advanced Settings → VoIP Deskphone → Manage Devices → Edit icon
Delete a deskphone: Same menu → Delete (immediately unregisters the handset)
Add another phone: Repeat the wizard (must be linked to a different user)
View call logs & recordings: Conversations → All Calls
When a linked user is deleted or transferred, the SIP credentials are automatically disabled. Outbound calls return “403 Forbidden”; inbound calls play an intercept message.
FAQs
Can one location have multiple SIP domains?
Not right now. Most businesses only need one.
Will my existing Yealink / Poly / Cisco phone work?
Yes, if it supports generic SIP registration. Factory-reset first, then follow the steps above.
What happened to “Ring All”?
The maximum members is now 6 (was 7). If you previously had 7, the 7th entry was removed automatically after enabling this feature.
Can two deskphones point at the same GHL user?
No. Create an additional (hidden) user for each handset.
Is there an extra charge?
No. Calls made from a deskphone are billed the same as calls from the web or mobile app. Call Transfers from Deskphones do cost an extra $0.10 per transfer (SIP Refer)
