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Outbound reminder call with confirm / reschedule / cancel - all outcomes stored per appointment. XML elements used: <Speak>, <Gather inputType=dtmf numDigits=1>, <Redirect>, <Hangup>

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Clone and run the full working example

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Getting started

git clone https://github.com/vobiz-ai/-Vobiz-Appointment-reminder-XML-Python.git
cd -Vobiz-Appointment-reminder-XML-Python
cp .env.example .env
pip install -r requirements.txt
python server.py

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Overview

A CRM or booking system triggers outbound reminder calls before appointments. The callee presses 1 to confirm, 2 to request a reschedule, or 3 to cancel (with a double-confirm step). All outcomes are stored and queryable via API with bulk scheduling support.
Status lifecycle: pending → calling → confirmed / reschedule_requested / cancelled / no_answer. Cancel via API before the call fires: aborted.

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Call flow

Your CRM
  └── POST /appointments {"phone":"+91...", "name":"John", "date":"Apr 5", "time":"3 PM"}
        └── AppointmentStore.create() → status: pending
        └── Trigger Vobiz outbound call → status: calling
              └── /answer
                    "Hello John! Reminder: appointment on Apr 5 at 3 PM."
                    Gather: 1=Confirm  2=Reschedule  3=Cancel  9=Repeat
                      ├── 1 → "Confirmed. See you soon!" → Hangup  (status: confirmed)
                      ├── 2 → "Please call us to reschedule." → Hangup (status: reschedule_requested)
                      ├── 3 → "Are you sure?" → Gather 1=Yes / 2=No
                      │         ├── 1 → "Cancelled." → Hangup  (status: cancelled)
                      │         └── 2 → Back to reminder
                      └── (no input) → Hangup  (status: no_answer)

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Vobiz webhooks

Set /answer as the Answer URL in your Vobiz application.
MethodPathDescription
POST/answerReads reminder, collects DTMF
POST/appt-choiceRoutes 1=confirm / 2=reschedule / 3=cancel
POST/appt-cancel-confirmDouble confirms cancellation
POST/hangupMarks no_answer if no digit was pressed

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App API

MethodPathDescription
POST/appointmentsSchedule a single reminder call
POST/appointments/bulkSchedule multiple at once (JSON array)
GET/appointmentsList all with outcomes (?status= to filter)
GET/appointments/{id}Single appointment status
PATCH/appointments/{id}/cancelCancel before call is made
GET/appointments/statsOutcome breakdown by status

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Environment variables

VariableRequiredDescription
VOBIZ_AUTH_IDYesVobiz account auth ID
VOBIZ_AUTH_TOKENYesVobiz account auth token
FROM_NUMBERYesYour Vobiz DID
HTTP_PORTNoServer port (default: 8000)
PUBLIC_URLNoProduction URL - skips ngrok if set
NGROK_AUTH_TOKENNongrok auth token for local dev