Snom IP Phone, DECT and Paging Setup Guide

← Hardware & Devices

SIPSTACK Nova PBX can generate the configuration for Snom D-series desk phones, the Snom PA1 paging amplifier and Snom M300 and M900 DECT bases. You register the device in Switchboard, point it at your organization’s provisioning URL, and it downloads its lines, keys and dial plan.

Snom models are marked Beta in the Switchboard model picker and on this page.

Supported Models

Model	Type	Lines	Line keys	Status
D120	Desk phone	2	2	Beta
D713	Desk phone	6	4	Beta
D717	Desk phone	6	3	Beta
D735	Desk phone	12	32	Beta
D785	Desk phone	12	24	Beta
D812	Desk phone	12	8	Beta
D815	Desk phone	12	10	Beta
D862	Desk phone	12	32	Beta
D865	Desk phone	12	40	Beta
D385	Desk phone	12	48	Beta (discontinued by vendor)
PA1	Paging amplifier	1	—	Beta
M300	DECT base	20	—	Beta
M900	DECT base	30	—	Beta
M400	DECT base	20	—	Manual setup: SIPSTACK does not generate a configuration for this model yet.
M15, M25, M65, M85, M90	DECT handsets	—	—	Pair to an M-series base

M400: the model is in the Switchboard catalog, but SIPSTACK does not generate a configuration for it yet. Set its handset accounts up by hand on the base’s web UI with each extension’s SIP credentials (Switchboard → Nova PBX → Extensions → [extension] → SIP Auth).

DECT handsets are not registered in Switchboard on their own. Register the base; see DECT Cordless Phones.

Before You Start: Your Provisioning URL and PIN

Every Nova PBX organization has one provisioning URL and one provisioning PIN that all of its devices share:

https://<slug>:<PIN>@cfg.sipstack.com/<slug>/

<slug> is your tenant slug (also the username).
<PIN> is your provisioning PIN — 8 digits for organizations set up since September 2026.

Both live in Switchboard → Nova PBX → System → PBX Settings → Provisioning Access. The URL is shown with the PIN masked; the Regenerate PIN button reveals a new PIN, once. The PIN is shown once when generated. Lost it? Rotate it in Provisioning Access — devices keep working on the old PIN for 24 hours.

There is no per-device password and nothing to copy from an individual device’s page: the same URL provisions every device in your organization.

Step 1: Register the Device in Switchboard

Log in to Switchboard.
Go to Nova PBX → Devices → Devices and click Register device. If the page asks you to generate your provisioning PIN first, do that in PBX Settings → Provisioning Access — devices cannot be registered until the PIN has been generated.
Enter the device’s MAC address from its label.
Pick Snom and the model (it shows a Beta badge), then click Register device.
On a desk phone or PA1, assign an extension to line 1 and add any BLF or speed-dial keys. On an M300 or M900 base, assign an extension to each handset slot on the Handsets tab.
Click Apply Changes. Applying publishes the device’s configuration to the provisioning server — until you apply, the server has nothing to hand the device.

Step 2: Point the Device at the Provisioning Server

Option A — DHCP. If your DHCP server hands out option 160 with the organization URL above, the device can fetch its configuration on its own. Some devices read option 66 instead; if yours does, set option 66 to the same URL. See DHCP Option 160.

Option B — enter it in the web UI.

Open http://{device-ip} in a browser (a desk phone shows its IP on screen).
Go to Advanced → Update.
Set Setting URL to https://cfg.sipstack.com/<slug>/ and save.
When the device asks for provisioning credentials, enter <slug> as the user name and your provisioning PIN as the password. If your firmware does not ask, put them in the URL instead: https://<slug>:<PIN>@cfg.sipstack.com/<slug>/.
Reboot the device. It requests its own file by MAC address and registers.

SIPSTACK never writes the Setting URL back into the configuration it sends, so the URL you entered (with your PIN) stays on the device.

What SIPSTACK Configures

Desk phones (D-series)

Lines. Every line the model has: extension credentials, the Nova SIP server (also set as the outbound proxy), and the voicemail mailbox. A line with no extension assigned is turned off and its credentials are cleared.
Dial plan. Rules that send a call the moment it is complete: 911, 988 and 112, Nova’s single star codes (*97, *72, *78 and the rest), star codes followed by a 4-digit extension or page group (*80, *81, *85, *87, *98, *55), and 10- and 11-digit North American numbers. Everything else (3- and 4-digit extensions, *80 + a 3-digit group, 011 numbers) is sent unchanged when you press OK or #, or when you stop dialling.
Paging and intercom auto-answer. Pages (*80) and intercom calls (*81) are answered hands-free when the phone isn’t already on a call.
BLF keys. A BLF key shows the watched extension’s state and picks up its ringing call (Nova *87).
Speed-dial and feature keys. Speed dial, voicemail, group pickup (*88), intercom, paging, Do Not Disturb and call forward keys dial the matching number or Nova code.
Time zone and NTP server, when your organization or device has a time zone chosen and Snom has a matching zone.
Admin password, when your organization has one set.

PA1 paging amplifier

One line with the extension’s credentials, set to answer every call automatically so pages play straight through the speaker.

M300 / M900 DECT bases

One SIP account per handset slot, with the extension you assigned on the Handsets tab, the Nova SIP server and the voicemail number.
Time zone and NTP server.

SIPSTACK sends Snom devices a “reprovision” signal when you click Reprovision on the device page. Support for this brand is in Beta, so the signal is not yet confirmed on every model: if the device has not picked up your change after a minute, reboot it.

What SIPSTACK Does Not Configure

The Setting URL (see above).
Park keys. A park key is skipped and Switchboard shows a warning. Park calls by transferring them to the park extension instead.
Expansion modules. Keys on a module are skipped with a warning.
Codec preferences, message-waiting tuning and user-level web credentials. The phone keeps its own.
Handset pairing on M-series bases. SIPSTACK creates the accounts on the base but does not bind handsets to them. Pair each handset to the base and choose its account in the base’s web UI.
Dial plan and auto-answer on M-series handsets. Handsets send the whole number at once, so Nova codes pass unchanged; pages ring the handset rather than opening its speaker.
The M400 base (manual setup, see above).
Firmware. SIPSTACK does not update Snom firmware unless you pin a firmware version for the model in Switchboard, and only where its firmware catalog lists one.

Troubleshooting

Symptom	Likely cause	Fix
Line shows unregistered	The device has no configuration yet: MAC not registered, no extension assigned, or changes not applied	Check the MAC in Nova PBX → Devices, assign an extension, click Apply Changes, then reboot the device
Provisioning fails with `401`	Wrong slug or PIN	Compare with PBX Settings → Provisioning Access; after a rotation the previous PIN stops working 24 hours later
Provisioning fails for every device at once	100 failed attempts within an hour paused provisioning for your organization	Correct the PIN, wait for the hour to pass, then reboot one device before the rest
An M-series handset has no service	The handset is paired but not bound to an account	In the base’s web UI, bind the handset to the account for its slot
A 3-digit extension takes a few seconds to dial	The phone waits in case you dial a fourth digit	Press OK or `#` after the number
Registration fails, then the device can’t reach SIPSTACK at all for a while	The device is registering to the wrong SIP server or domain, often a value left over from a previous provider. Repeated failed registrations from your network can trigger a temporary IP block	The SIP server must be your organization’s SIP server exactly as shown on the extension’s SIP Auth tab. Factory reset the device so the provisioned value is used, wait for the block to clear, then try again. Contact support if it continues

For additional support, contact SIPSTACK at https://www.sipstack.com/contact.