CallHQ provides a robust session-based approach for maintaining conversation context across multiple chat interactions. Session-Based Context Management:
  • sessionId - Groups multiple chats under a persistent session
  • Automatic Context Preservation - All messages within a session maintain conversation history
  • Easy Session Management - Create, use, and retrieve sessions with simple API calls

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Prerequisites

  • Completed Chat quickstart tutorial
  • Basic understanding of chat requests and responses

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How Sessions Work

Sessions in CallHQ provide a persistent container for conversations. Once you create a session, all subsequent messages sent to that session automatically maintain context and conversation history.
Important Session Information:
  • Sessions expire automatically after 24 hours by default
  • After expiration, you’ll need to create a new session to continue conversations
  • Web chat widget and SMS conversations automatically manage session creation and expiration
  • You don’t need to manually create or manage sessions when using these channels
1

Create a session

Start by creating a new chat session with your assistant:
Create Session
curl -X POST https://api.callhq.ai/api/sessions \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "name": "Customer Support Session",
    "assistantId": "your-assistant-id"
  }'
2

Get session ID from response

The response will include your session ID:
Session Response
{
  "message": "Session created successfully",
  "session": {
    "id": "session-abc123",
    "name": "Customer Support Session",
    "assistantId": "your-assistant-id",
    "status": "active",
    "messages": [],
    "createdAt": "2024-01-15T09:30:00Z",
    "updatedAt": "2024-01-15T09:30:00Z"
  }
}
3

Use session ID in all related chats

Send messages using the session ID to maintain context:
First Chat in Session
curl -X POST https://api.callhq.ai/api/chats \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "sessionId": "session-abc123",
    "input": "Hello, I need help with billing"
  }'

​
TypeScript Session Manager

Here’s a complete TypeScript implementation for managing chat sessions:
session-manager.ts
interface Session {
  id: string;
  name: string;
  assistantId: string;
  status: string;
  messages: Array<{ role: string; content: string }>;
  createdAt: string;
  updatedAt: string;
}

interface ChatResponse {
  message: string;
  chat: {
    id: string;
    sessionId: string;
    input: string;
    output: Array<{ role: string; content: string }>;
    status: string;
    cost: number;
    createdAt: string;
    updatedAt: string;
  };
}

class CallHQSessionManager {
  private apiKey: string;
  private sessionId?: string;
  private sessionName: string;
  private assistantId: string;

  constructor(apiKey: string, sessionName: string, assistantId: string) {
    this.apiKey = apiKey;
    this.sessionName = sessionName;
    this.assistantId = assistantId;
  }

  async createSession(): Promise<string> {
    const response = await fetch('https://api.callhq.ai/api/sessions', {
      method: 'POST',
      headers: {
        'x-api-key': this.apiKey,
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({
        name: this.sessionName,
        assistantId: this.assistantId
      })
    });

    if (!response.ok) {
      throw new Error(`Failed to create session: ${response.status}`);
    }

    const result = await response.json();
    this.sessionId = result.session.id;
    return this.sessionId;
  }

  async sendMessage(input: string): Promise<string> {
    if (!this.sessionId) {
      throw new Error('No active session. Create a session first.');
    }

    const response = await fetch('https://api.callhq.ai/api/chats', {
      method: 'POST',
      headers: {
        'x-api-key': this.apiKey,
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({
        sessionId: this.sessionId,
        input
      })
    });

    if (!response.ok) {
      throw new Error(`Failed to send message: ${response.status}`);
    }

    const result: ChatResponse = await response.json();
    return result.chat.output[0].content;
  }

  async getConversationHistory(): Promise<Array<{ role: string; content: string }>> {
    if (!this.sessionId) {
      throw new Error('No active session.');
    }

    const response = await fetch(`https://api.callhq.ai/api/chats/session/${this.sessionId}`, {
      headers: {
        'x-api-key': this.apiKey
      }
    });

    if (!response.ok) {
      throw new Error(`Failed to get conversation history: ${response.status}`);
    }

    const result = await response.json();
    return result.session.messages;
  }

  getSessionId(): string | undefined {
    return this.sessionId;
  }

  isSessionActive(): boolean {
    return !!this.sessionId;
  }
}

// Usage
const sessionManager = new CallHQSessionManager(
  'your-api-key',
  'Customer Support Session',
  'your-assistant-id'
);

// Create session and start chatting
await sessionManager.createSession();
await sessionManager.sendMessage("Hello, I need help with my account");
await sessionManager.sendMessage("I forgot my password");
await sessionManager.sendMessage("What was my first question?"); // Remembers context

// Get full conversation history
const history = await sessionManager.getConversationHistory();
console.log('Conversation history:', history);

​
Multi-Session Workflows

For complex applications that need multiple concurrent conversations, you can manage multiple sessions:
multi-session-manager.ts
class MultiSessionManager {
  private apiKey: string;
  private sessions: Map<string, CallHQSessionManager> = new Map();

  constructor(apiKey: string) {
    this.apiKey = apiKey;
  }

  async getOrCreateSession(sessionName: string, assistantId: string): Promise<CallHQSessionManager> {
    const key = `${sessionName}-${assistantId}`;
    
    if (!this.sessions.has(key)) {
      const sessionManager = new CallHQSessionManager(this.apiKey, sessionName, assistantId);
      await sessionManager.createSession();
      this.sessions.set(key, sessionManager);
    }

    return this.sessions.get(key)!;
  }

  async sendMessage(sessionName: string, assistantId: string, input: string): Promise<string> {
    const session = await this.getOrCreateSession(sessionName, assistantId);
    return session.sendMessage(input);
  }

  getAllSessions(): Array<{ name: string; assistantId: string; sessionId: string }> {
    return Array.from(this.sessions.entries()).map(([key, session]) => {
      const [name, assistantId] = key.split('-');
      return {
        name,
        assistantId,
        sessionId: session.getSessionId() || ''
      };
    });
  }
}

// Usage
const multiManager = new MultiSessionManager('your-api-key');

// Handle multiple customer conversations
await multiManager.sendMessage('Customer A', 'support-assistant', 'Hello, I need help');
await multiManager.sendMessage('Customer B', 'sales-assistant', 'I want to buy a product');
await multiManager.sendMessage('Customer A', 'support-assistant', 'What was my issue?'); // Remembers context

console.log('Active sessions:', multiManager.getAllSessions());

​
Session Lifecycle Management

​
Creating Sessions

  • Sessions are created with a name and assistant ID
  • Each session gets a unique identifier
  • Sessions start in “active” status

​
Using Sessions

  • Send messages using the session ID
  • All messages within a session maintain context
  • Sessions automatically track conversation history

​
Session Expiration

Session Expiration Rules:
  • Sessions expire automatically after 24 hours by default
  • After expiration, you’ll need to create a new session to continue conversations
  • Web chat widget and SMS conversations automatically manage session creation and expiration
  • You don’t need to manually create or manage sessions when using these channels

​
Retrieving Session Data

  • Get conversation history for any active session
  • View all messages in chronological order
  • Monitor session status and metadata

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Best Practices

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Session Naming

// Good: Descriptive names
"Customer Support - John Doe"
"Lead Qualification - TechCorp Inc"
"Onboarding - New User 123"

// Avoid: Generic names
"Session 1"
"Chat"
"Test"

​
Session Organization

// Organize by customer/user
const customerSession = await multiManager.getOrCreateSession(
  `Customer-${customerId}`,
  'support-assistant'
);

// Organize by conversation type
const salesSession = await multiManager.getOrCreateSession(
  `Sales-${leadId}`,
  'sales-assistant'
);

​
Error Handling

try {
  const response = await sessionManager.sendMessage("Hello");
  console.log(response);
} catch (error) {
  if (error.message.includes('No active session')) {
    // Recreate session
    await sessionManager.createSession();
    const response = await sessionManager.sendMessage("Hello");
    console.log(response);
  } else {
    console.error('Chat error:', error);
  }
}

​
Webhook Support

Sessions support the following webhook events through server messaging:
  • session.created - Triggered when a new session is created
  • session.updated - Triggered when a session is updated
  • session.deleted - Triggered when a session is deleted
To receive these webhooks, go to your Assistant page in the Dashboard and navigate to “Server Messaging” and select the events you want to receive.These webhooks are useful for tracking session lifecycle, managing session state in your own database, and triggering workflows based on session changes.

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Next Steps