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Support & Technical Documentation

CrazyPhone - team setup, ring groups, and shared SMS

Getting Started documentation and configuration reference.

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Getting Started Updated 23 Oct 2026 5 min read 315 views
Markdown

CrazyPhone team setup: one SIP trunk or CrazyPBX extension per person, Premium Ring Group to ring everyone on the same number, and shared SMS on one virtual mobile - SMS history sync optional.

CrazyPhone Ring Group SMS Team Virtual Mobile

CrazyPhone - team setup, ring groups, and shared SMS

CrazyPhone is Crazytel's official softphone app. It registers to one SIP trunk or one CrazyPBX extension at a time. That registration is a single endpoint: one person, one trunk or extension.

If two people scan the same CrazyPhone QR code or share one trunk password, they are not two separate users. They share one registration. Inbound calls and outbound caller ID behave as one line, not a team phone system.

This guide explains the recommended setup when a practice, office, or team needs more than one person on the same Virtual Mobile Number (VMN) or business number.

Best practice: one person per SIP trunk or extension

Always give each person their own SIP trunk or CrazyPBX extension.

| Person | Recommended setup |

| --- | --- |

| Person 1 | Their own standard or Hybrid SIP trunk, or their own CrazyPBX extension |

| Person 2 | A second SIP trunk or a second CrazyPBX extension |

| Person 3+ | Add another trunk or extension for each additional person |

Each person scans their own CrazyPhone QR code from MyAccount. Do not reuse one trunk QR across multiple staff members.

CrazyPBX is the right product when you want a hosted phone system with multiple staff extensions and extension-to-extension calling. See CrazyPBX - How to make a CrazyPBX Extension.

Standard or Hybrid SIP trunks suit simpler setups where each person has their own line. See Creating a Register Based SIP Trunk.

Route your VMN or number to a Ring Group

A Virtual Mobile Number or any inbound DID is just a phone number. It does not include users. To let multiple people answer the same number, point the number at a Premium Ring Group, not directly at one CrazyPhone device.

  1. Create a separate SIP trunk or CrazyPBX extension for each person who should answer.
  2. Register each person's CrazyPhone app to their own trunk or extension.
  3. Create a Premium Ring Group and add each trunk or extension as a destination.
  4. In Number Management, set the VMN or DID to ring the Ring Group.

When someone calls the shared number, every destination in the Ring Group can ring according to the group type (ring all, ring in order, or pick randomly).

For step-by-step Ring Group creation on SIP trunks, see How to: Make a SIP Trunk Ring Group.

Do not point one VMN directly at one CrazyPhone trunk and expect two people to use that same trunk as two simultaneous users. That is one registered endpoint only.

Share SMS between CrazyPhone apps

Calls need separate trunks or extensions plus a Ring Group. SMS can be shared across multiple CrazyPhone installations: an SMS route on the VMN can deliver inbound texts to one trunk or extension, or to several at once. Set the same SMS Caller ID (your Virtual Mobile Number) on each trunk or extension so replies go out under the shared 04.

Standard SIP trunks

  1. Sign in to MyAccount and open Products > SIP Trunks.
  2. For each trunk used with CrazyPhone, set SMS Caller ID to the same Virtual Mobile Number (for example the same 04 number).
  3. Optional: enable Sync SMS to CrazyPhone (softphone_sync_sms) on each trunk so messages sent from one app appear in the others. Inbound SMS arrives either way.
  4. Each person scans their own trunk QR into CrazyPhone.

Inbound SMS for that VMN reaches every app its SMS routes target; sent replies appear in the other apps as well when sync is on.

Hybrid SIP trunks

  1. Sign in to MyAccount and open Products > SIP Trunks (Hybrid) > Manage Trunks.
  2. For each Hybrid trunk, set SMS Caller ID to the same Virtual Mobile Number.
  3. Optional: Sync SMS history (sync_sms_history) is on by default when no setting exists. It only syncs sent replies between the apps - inbound SMS arrives either way.
  4. Each person scans their own Hybrid trunk CrazyPhone QR.

CrazyPBX extensions

Set the same SMS Caller ID on each extension that should share the VMN inbox, then register each extension separately in CrazyPhone.

Important SMS notes

  • SMS on a Virtual Mobile Number is billed at 5 cents per SMS unless the account has the CrazyPhone unlimited SMS add-on. See Common Virtual Mobile Number questions.
  • Sync SMS is optional - it only syncs sent replies between the apps; inbound texts arrive on every configured route with or without it.
  • Sharing SMS history does not turn two trunks into one phone line for calls. Calls still need the Ring Group setup above.
  • Desktop CrazyPhone works with trunks and extensions too: use the Open Setup Link under the QR on the same QR screen.

Quick comparison

| Need | Recommended approach |

| --- | --- |

| Two people answer the same number | Premium Ring Group + one trunk or extension per person |

| Two people send and receive SMS on the same 04 | An SMS route to each trunk or extension + the same SMS Caller ID on each; SMS sync optional for shared sent replies |

| Full office phone system with many staff | CrazyPBX with one extension per person |

| Website SMS inbox with separate team logins | Messaging Hub (separate from CrazyPhone) |

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