Use AssistCall with Microsoft Bookings

AssistCall answers your business calls 24/7 and can send each call, message and booking to Microsoft Bookings through Webhook, n8n.

Microsoft Bookings: Microsoft 365's booking pages and shared appointment calendar for teams, connected to Outlook and Teams.

Connects

Example call

A caller asks for a tax-prep consult. The receptionist books it and AssistCall sends appointment.booked to an n8n workflow, which creates the appointment in Microsoft Bookings. Staff see it in Bookings and on their Outlook calendars.

AssistCall's appointment.booked event goes to an n8n workflow, which creates the appointment in your shared Bookings calendar through Microsoft Graph.
AssistCall's call.completed events go to n8n, which adds new callers to Bookings as customers with their name and phone number.
When a caller cancels, an n8n workflow cancels the matching Bookings appointment through Graph.

How it connects

Webhook: Signed JSON for every call, message and booking, sent to any HTTPS URL you choose.
n8n: Start an n8n workflow with a webhook node, then call the app with its node or an HTTP request.
Call forwarding: Forward your business line to AssistCall when busy, after hours or always. Works with any carrier.

About Microsoft Bookings's API

Self-serve API: you can create a key in your account
Style: REST (Microsoft Graph Bookings API)
Authentication: OAuth 2.0 with delegated or application permissions (e.g. BookingsAppointment.ReadWrite.All)
On Zapier: no. On Make: no.

The Graph Bookings API covers shared booking pages only, not personal bookings. It needs an app registered in Microsoft Entra ID with admin consent, and its tokens are short-lived. Zapier has no Microsoft Bookings app and we found none on Make, so connections go through n8n or your own code.

Not included: no one-click Microsoft Bookings app, no listing in Microsoft Bookings's marketplace, no two-way sync, and no partnership with Microsoft.

Researched by the AssistCall team and checked against Microsoft's public pages on October 24, 2026. Microsoft Bookings is a trademark of Microsoft. AssistCall is an independent product of Starling Global LLC and is not affiliated with, endorsed by, sponsored by or approved by Microsoft.

More Calendars and scheduling integrations

Calendly: Online scheduling links that let clients pick an open time on your calendar, used by consultants, coaches, sales teams and service businesses.
Google Calendar: Google's online calendar, included with Gmail and Google Workspace, which many small businesses use to track appointments, jobs and staff schedules.
Microsoft Outlook Calendar: The calendar in Outlook and Microsoft 365, used by offices that run their email, meetings and scheduling on Microsoft 365.
Square Appointments: Square's booking and payments app for appointment businesses such as salons, barbershops, spas and wellness studios.
Acuity Scheduling: Online appointment scheduling from Squarespace with intake forms, packages and payments, used by solo practitioners and small service teams.
Cal.com: Open-source scheduling links and booking pages, hosted or self-hosted, used by consultants, agencies and software teams.

All product and company names in this directory are trademarks or registered trademarks of their respective owners, used only to identify systems AssistCall can send call information to or receive information from. Their use does not imply any affiliation with or endorsement by their owners. AssistCall connects using signed webhooks, the business's own API keys, automation platforms (Zapier, Make, n8n) the business sets up in its own account, and call forwarding. AssistCall does not provide one-click connectors, marketplace apps, certifications or two-way record or calendar sync, and does not sign HIPAA business associate agreements. Vendor features, plans and API access can change; information last checked October 24, 2026.