This workflow follows the HTTP Request → Slack recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"nodes": [
{
"id": "sticky-title",
"name": "Sticky Note",
"type": "n8n-nodes-base.stickyNote",
"typeVersion": 1,
"position": [
-1160,
-300
],
"parameters": {
"content": "## Missed Call Text Back\n- Every missed call gets a text back within seconds, so the caller is not left hanging\n- Calls that land late at night wait politely and get their text at 8am",
"height": 200,
"width": 480
}
},
{
"id": "sticky-quiet-hours",
"name": "Sticky Note1",
"type": "n8n-nodes-base.stickyNote",
"typeVersion": 1,
"position": [
-260,
-260
],
"parameters": {
"content": "## Quiet hours\n- A call between 8pm and 8am holds here and the text goes out at 8am",
"height": 160,
"width": 400,
"color": 4
}
},
{
"id": "webhook-missed-call",
"name": "Phone system reports a missed call",
"type": "n8n-nodes-base.webhook",
"typeVersion": 2,
"position": [
-1100,
0
],
"parameters": {
"httpMethod": "POST",
"path": "demo/missed-call",
"responseMode": "responseNode",
"options": {}
}
},
{
"id": "code-read-call",
"name": "Read the call details",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
-880,
0
],
"parameters": {
"jsCode": "// Missed-call events look different depending on the phone system.\n// Check the common shapes one after another: Quo/OpenPhone style,\n// Twilio style (a call that ended with CallStatus no-answer or busy),\n// CallRail style, and a plain flat shape. Whichever one arrives, we\n// pull out the same four facts: who called, their name if we have it,\n// which line they dialed, and when.\nconst raw = $json.body && typeof $json.body === 'object' ? $json.body : $json;\n\nconst pick = (...keys) => {\n for (const k of keys) {\n const v = raw[k];\n if (v !== undefined && v !== null && String(v).trim() !== '') return String(v).trim();\n }\n return '';\n};\n\nconst digitsWithPlus = (p) => {\n let out = String(p).replace(/[^\\d+]/g, '');\n if (out && !out.startsWith('+')) {\n out = out.length === 10 ? `+1${out}` : `+${out}`;\n }\n return out;\n};\n\nconst phone = digitsWithPlus(pick('caller', 'from', 'From', 'callerNumber', 'caller_number', 'customer_phone_number', 'phone'));\nconst callerName = pick('callerName', 'caller_name', 'CallerName', 'customer_name', 'name');\nconst lineCalled = digitsWithPlus(pick('called', 'to', 'To', 'calledNumber', 'called_number', 'tracking_phone_number', 'business_phone_number', 'line'));\nconst calledAt = pick('callTime', 'call_time', 'timestamp', 'Timestamp', 'createdAt', 'start_time', 'time') || new Date().toISOString();\n\nconst TZ = 'America/Denver';\nconst parsed = new Date(calledAt);\nconst calledAtLocal = (isNaN(parsed.getTime()) ? new Date() : parsed).toLocaleString('en-US', { timeZone: TZ });\n\n// Quiet hours: no texting between 8pm and 8am Denver time.\n// A late-night call gets its text held until 8am instead.\nconst nowLocal = new Date(new Date().toLocaleString('en-US', { timeZone: TZ }));\nconst hour = nowLocal.getHours();\nconst minute = nowLocal.getMinutes();\nconst canTextNow = hour >= 8 && hour < 20;\n\nlet waitMinutes = 0;\nif (!canTextNow) {\n waitMinutes = hour < 8 ? (8 - hour) * 60 - minute : (24 - hour + 8) * 60 - minute;\n}\nconst sendAt = new Date(Date.now() + waitMinutes * 60000).toISOString();\n\nreturn { phone, callerName, lineCalled, calledAt, calledAtLocal, canTextNow, sendAt };"
}
},
{
"id": "respond-ok",
"name": "Tell the phone system we got it",
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.1,
"position": [
-660,
0
],
"parameters": {
"respondWith": "json",
"responseBody": "{\n \"status\": \"received\"\n}",
"options": {}
}
},
{
"id": "ghl-save-caller",
"name": "Save the caller in GoHighLevel",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
-440,
0
],
"parameters": {
"method": "POST",
"url": "https://services.leadconnectorhq.com/contacts/upsert",
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth",
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "Version",
"value": "2021-07-28"
}
]
},
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={{ JSON.stringify({ locationId: 'bsHomeSvcDemo01', phone: $('Read the call details').item.json.phone, name: $('Read the call details').item.json.callerName || undefined, tags: ['missed-call', 'needs-text-back'] }) }}",
"options": {}
},
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
}
},
{
"id": "if-quiet-hours",
"name": "Okay to text right now?",
"type": "n8n-nodes-base.if",
"typeVersion": 2.2,
"position": [
-220,
0
],
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "strict",
"version": 2
},
"conditions": [
{
"id": "in-texting-window",
"leftValue": "={{ $('Read the call details').item.json.canTextNow }}",
"rightValue": true,
"operator": {
"type": "boolean",
"operation": "true",
"singleValue": true
}
}
],
"combinator": "and"
},
"options": {}
}
},
{
"id": "wait-until-8am",
"name": "Hold the text until 8am",
"type": "n8n-nodes-base.wait",
"typeVersion": 1.1,
"position": [
0,
180
],
"parameters": {
"resume": "specificTime",
"dateTime": "={{ $('Read the call details').item.json.sendAt }}"
}
},
{
"id": "sms-text-back",
"name": "Text the caller back",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
220,
0
],
"parameters": {
"method": "POST",
"url": "https://services.leadconnectorhq.com/conversations/messages",
"authentication": "genericCredentialType",
"genericAuthType": "httpHeaderAuth",
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "Version",
"value": "2021-07-28"
}
]
},
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={{ JSON.stringify({ type: 'SMS', contactId: $('Save the caller in GoHighLevel').item.json.contact?.id || $('Save the caller in GoHighLevel').item.json.id, message: 'Hey, this is Blue Summit Home Services. We just missed your call. What can we help with?' }) }}",
"options": {}
},
"credentials": {
"httpHeaderAuth": {
"name": "<your credential>"
}
}
},
{
"id": "slack-missed-calls",
"name": "Post a note in #missed-calls",
"type": "n8n-nodes-base.slack",
"typeVersion": 2.3,
"position": [
440,
0
],
"parameters": {
"resource": "message",
"operation": "post",
"select": "channel",
"channelId": {
"__rl": true,
"mode": "name",
"value": "missed-calls"
},
"text": "=Missed call from {{ $('Read the call details').item.json.phone }}{{ $('Read the call details').item.json.callerName ? ' (' + $('Read the call details').item.json.callerName + ')' : '' }} at {{ $('Read the call details').item.json.calledAtLocal }}. {{ $('Read the call details').item.json.canTextNow ? 'Text back sent right away.' : 'Call came in overnight, so the text was held and sent at 8am.' }}",
"otherOptions": {}
},
"credentials": {
"slackApi": {
"name": "<your credential>"
}
}
}
],
"connections": {
"Phone system reports a missed call": {
"main": [
[
{
"node": "Read the call details",
"type": "main",
"index": 0
}
]
]
},
"Read the call details": {
"main": [
[
{
"node": "Tell the phone system we got it",
"type": "main",
"index": 0
}
]
]
},
"Tell the phone system we got it": {
"main": [
[
{
"node": "Save the caller in GoHighLevel",
"type": "main",
"index": 0
}
]
]
},
"Save the caller in GoHighLevel": {
"main": [
[
{
"node": "Okay to text right now?",
"type": "main",
"index": 0
}
]
]
},
"Okay to text right now?": {
"main": [
[
{
"node": "Text the caller back",
"type": "main",
"index": 0
}
],
[
{
"node": "Hold the text until 8am",
"type": "main",
"index": 0
}
]
]
},
"Hold the text until 8am": {
"main": [
[
{
"node": "Text the caller back",
"type": "main",
"index": 0
}
]
]
},
"Text the caller back": {
"main": [
[
{
"node": "Post a note in #missed-calls",
"type": "main",
"index": 0
}
]
]
}
}
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
httpHeaderAuthslackApi
Pro
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About this workflow
Missed-Call-Text-Back. Uses httpRequest, slack. Webhook trigger; 10 nodes.
Source: https://github.com/mcruz1799/automation-examples/blob/main/claude-code/02-automation-file-factory/skills/n8n/section-templates/missed-call-text-back.json — original creator credit. Request a take-down →
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