This workflow follows the HTTP Request → Slack recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
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{
"name": "WF-OB-1: First Call Scheduler",
"nodes": [
{
"parameters": {
"rule": {
"interval": [
{
"field": "cronExpression",
"expression": "45 10 * * 1-5"
},
{
"field": "cronExpression",
"expression": "0 16 * * 1-5"
},
{
"field": "cronExpression",
"expression": "15 17 * * 1-5"
},
{
"field": "cronExpression",
"expression": "30 9 * * 6"
}
]
}
},
"id": "schedule",
"name": "Schedule Trigger",
"type": "n8n-nodes-base.scheduleTrigger",
"typeVersion": 1.2,
"position": [
0,
0
]
},
{
"parameters": {
"jsCode": "var now = new Date(); var etHour = 0; var day = now.getDay(); var timezone='ET'; if(etHour>=17){timezone='PT';}else if(etHour>=15){timezone='CT';} var businessHoursOk=true; return [{ json: { timezone: timezone, maxPerBatch: 4, businessHoursOk: businessHoursOk, dayOfWeek: day } }];"
},
"id": "determine_tz",
"name": "Determine Timezone Window",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
224,
0
]
},
{
"parameters": {
"url": "https://api.close.com/api/v1/lead/",
"authentication": "genericCredentialType",
"genericAuthType": "httpBasicAuth",
"sendQuery": true,
"queryParameters": {
"parameters": [
{
"name": "query",
"value": "custom.cf_VFuXiSLbhAQIp4448PknymYFsHUx6P1rJpcvMimLz3j:\"VoiceSDR AI\" AND custom.cf_L6lj9vbbe1pnuRA2tAAeZs6eso00WI5MI8RNf23Bykn:1"
},
{
"name": "_fields",
"value": "id,display_name,contacts,custom,status_id"
},
{
"name": "_limit",
"value": "50"
}
]
},
"options": {
"response": {
"response": {
"neverError": true
}
},
"timeout": 30000
}
},
"id": "search_close",
"name": "Search Close CRM",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
448,
0
],
"onError": "continueRegularOutput"
},
{
"parameters": {
"jsCode": "var response = $input.first().json; var data = response.data || []; var results = []; for (var i=0;i<data.length;i++){ var lead=data[i]; lead.callSequence=1; lead.isFollowUp=false; results.push({json:lead}); } return results;"
},
"id": "extract_leads",
"name": "Extract Close Leads",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
464,
-144
]
},
{
"parameters": {
"jsCode": "var coveredStates=['OH']; var items=$input.all(); var allowed=[]; for(var i=0;i<items.length;i++){ allowed.push(items[i]); } return allowed;"
},
"id": "filter_states",
"name": "Filter Blocked States",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
704,
0
]
},
{
"parameters": {
"jsCode": "var leads=$input.all().map(function(item){return item.json;}); return leads.map(function(lead){return {json:lead};});"
},
"id": "filter_tz",
"name": "Filter by TZ + Extract",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
896,
0
]
},
{
"parameters": {
"conditions": {
"options": {
"version": 2,
"leftValue": "",
"caseSensitive": true,
"typeValidation": "strict"
},
"combinator": "and",
"conditions": [
{
"id": "hl1",
"leftValue": "={{ $json.no_leads }}",
"rightValue": true,
"operator": {
"type": "boolean",
"operation": "notEquals"
}
}
]
},
"options": {}
},
"id": "has_leads",
"name": "Has Leads?",
"type": "n8n-nodes-base.if",
"typeVersion": 2.2,
"position": [
960,
-160
]
},
{
"parameters": {
"options": {}
},
"id": "batch",
"name": "SplitInBatches",
"type": "n8n-nodes-base.splitInBatches",
"typeVersion": 3,
"position": [
1264,
0
]
},
{
"parameters": {
"jsCode": "var items=$input.all(); var results=[]; var agentId='YOUR_RETELL_AGENT_ID'; for(var idx=0;idx<items.length;idx++){ var lead=items[idx].json; var phone=''; var firstName='there'; var fromNumber='+15555550100'; results.push({json:{ closeLeadId:lead.id, toNumber:phone, fromNumber:fromNumber, agentId:agentId, retellPayload:{ from_number:fromNumber, to_number:phone, override_agent_id:agentId, retell_llm_dynamic_variables:{ firstName:firstName, callDirection:'outbound' } } }}); } return results;"
},
"id": "build_retell",
"name": "Build Retell Payload",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
1568,
0
]
},
{
"parameters": {
"method": "POST",
"url": "https://api.retellai.com/v2/create-phone-call",
"sendHeaders": true,
"headerParameters": {
"parameters": [
{
"name": "Authorization",
"value": "Bearer YOUR_RETELL_API_KEY"
}
]
},
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={{ JSON.stringify($json.retellPayload) }}",
"options": {}
},
"id": "call_retell",
"name": "Call Retell API",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
1792,
0
],
"onError": "continueRegularOutput"
},
{
"parameters": {
"method": "POST",
"url": "https://YOUR_CONVEX_DEPLOYMENT/outbound-call-log",
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={{ JSON.stringify({ retellCallId: $json.call_id || '', closeLeadId: $('Build Retell Payload').first().json.closeLeadId, callStatus: 'initiated' }) }}",
"options": {}
},
"id": "log_convex",
"name": "Log Call to Convex",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
2016,
0
],
"onError": "continueRegularOutput"
},
{
"parameters": {
"method": "PUT",
"url": "=https://api.close.com/api/v1/lead/{{ $('Build Retell Payload').first().json.closeLeadId }}/",
"authentication": "genericCredentialType",
"genericAuthType": "httpBasicAuth",
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={{ JSON.stringify({ 'custom.cf_L6lj9vbbe1pnuRA2tAAeZs6eso00WI5MI8RNf23Bykn': 2 }) }}",
"options": {
"response": {
"response": {
"neverError": true
}
},
"timeout": 30000
}
},
"id": "update_close",
"name": "Update Close Call Fields",
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
2240,
0
],
"onError": "continueRegularOutput"
},
{
"parameters": {
"jsCode": "return $input.all();"
},
"id": "wait_1s",
"name": "Wait 1s",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
2464,
0
]
},
{
"parameters": {
"select": "channel",
"channelId": {
"__rl": true,
"value": "C0ABWBR67JL",
"mode": "list",
"cachedResultName": "test"
},
"text": "=*WF-OB-1 First Call Batch*\n:phone: *Timezone*: {{ $('Determine Timezone Window').first().json.timezone }}\n:busts_in_silhouette: *Batch Complete*",
"otherOptions": {}
},
"id": "slack_summary",
"name": "Slack Summary",
"type": "n8n-nodes-base.slack",
"typeVersion": 2.2,
"position": [
1792,
-224
],
"onError": "continueRegularOutput"
},
{
"parameters": {
"content": "## WF-OB-1: First Call Scheduler\n\n**Purpose**: Fire FIRST Retell AI call for new leads. VoiceSDR AI. Owner. Source: Close CRM search."
},
"id": "sticky_overview",
"name": "WF-OB-1 Overview",
"type": "n8n-nodes-base.stickyNote",
"typeVersion": 1,
"position": [
-208,
-352
]
},
{
"parameters": {
"maxItems": 10
},
"type": "n8n-nodes-base.limit",
"typeVersion": 1,
"position": [
752,
-160
],
"id": "cd10db62-4262-4b83-b45e-38b66d3102bb",
"name": "Limit"
},
{
"parameters": {
"jsCode": "return [{ json: { id: 'lead_bUgffcA1Ew4MzishfkVICz6D46N8VCTTgdbxrszD3My', display_name: 'Test caller', callSequence: 1, contacts: [{ id: 'cont_rtDRjEpvuYqoWgEiFhXQqwRt1Vfoc6XOvXhDeSnkmex', name: 'Test Caller', phones: [{ phone: '+15555550100', type: 'office' }], emails: [{ email: '', type: 'office' }] }] } }];"
},
"id": "test_data",
"name": "TEST - Inject Test Lead",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
736,
-368
]
}
],
"connections": {
"Schedule Trigger": {
"main": [
[
{
"node": "Determine Timezone Window",
"type": "main",
"index": 0
}
]
]
},
"Determine Timezone Window": {
"main": [
[
{
"node": "Search Close CRM",
"type": "main",
"index": 0
}
]
]
},
"Search Close CRM": {
"main": [
[
{
"node": "Extract Close Leads",
"type": "main",
"index": 0
}
]
]
},
"Extract Close Leads": {
"main": [
[
{
"node": "Filter Blocked States",
"type": "main",
"index": 0
}
]
]
},
"Filter Blocked States": {
"main": [
[
{
"node": "Filter by TZ + Extract",
"type": "main",
"index": 0
}
]
]
},
"Filter by TZ + Extract": {
"main": [
[
{
"node": "Limit",
"type": "main",
"index": 0
}
]
]
},
"Limit": {
"main": [
[
{
"node": "Has Leads?",
"type": "main",
"index": 0
}
]
]
},
"Has Leads?": {
"main": [
[
{
"node": "SplitInBatches",
"type": "main",
"index": 0
}
],
[
{
"node": "SplitInBatches",
"type": "main",
"index": 0
}
]
]
},
"SplitInBatches": {
"main": [
[
{
"node": "Slack Summary",
"type": "main",
"index": 0
}
],
[
{
"node": "Build Retell Payload",
"type": "main",
"index": 0
}
]
]
},
"Build Retell Payload": {
"main": [
[
{
"node": "Call Retell API",
"type": "main",
"index": 0
}
]
]
},
"Call Retell API": {
"main": [
[
{
"node": "Log Call to Convex",
"type": "main",
"index": 0
}
]
]
},
"Log Call to Convex": {
"main": [
[
{
"node": "Update Close Call Fields",
"type": "main",
"index": 0
}
]
]
},
"Update Close Call Fields": {
"main": [
[
{
"node": "Wait 1s",
"type": "main",
"index": 0
}
]
]
},
"Wait 1s": {
"main": [
[
{
"node": "SplitInBatches",
"type": "main",
"index": 0
}
]
]
},
"TEST - Inject Test Lead": {
"main": [
[]
]
}
},
"settings": {
"executionOrder": "v1",
"timezone": "America/New_York"
},
"active": false
}
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About this workflow
WF-OB-1: First Call Scheduler. Uses httpRequest, slack. Scheduled trigger; 17 nodes.
Source: https://github.com/rafiulislam4246/voice-sdr-title-agent/blob/main/workflows/voice-01-first-call-scheduler.json — original creator credit. Request a take-down →
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