VoIP Call Forwarding: A Comprehensive Guide for Developers

1sequenceDiagram
2    participant Caller
3    participant VoIP System
4    participant User A (Original Number)
5    participant User B (Forwarded Number)
6
7    Caller->>VoIP System: Incoming Call to User A
8    VoIP System->>User A: Attempt to Connect
9    alt Call Forwarding Enabled
10        VoIP System-->>User B: Forwarded Call
11        User B-->>Caller: Connects to User B
12    else
13        VoIP System-->>Caller: Connects to User A
14    end

11.  Log in to your VoIP provider's website.
22.  Navigate to the "Call Forwarding" or "Routing" section.
33.  Select the type of call forwarding you want to enable (e.g., Always-On, Busy, No Answer).
44.  Enter the phone number where you want calls to be forwarded.
55.  Save the changes.

1# Example of simulating call forwarding setup using a hypothetical VoIP provider's API
2
3def set_call_forwarding(username, password, forward_to_number, forwarding_type="always"):
4    # This is a placeholder and would need to be replaced with actual API calls
5    if not all([username, password, forward_to_number]):
6        return "Error: Missing credentials or forwarding number"
7    
8    print(f"Setting call forwarding for {username} to {forward_to_number} ({forwarding_type})")
9    # In a real application, you would make API calls here
10    return "Call forwarding settings updated successfully (Simulated)"
11
12# Example usage:
13result = set_call_forwarding("user123", "password", "+15551234567", "busy")
14print(result)

1*72<ForwardToNumber>#  - Activate Always-On Call Forwarding
2*73#             - Deactivate Always-On Call Forwarding
3*92<ForwardToNumber>#  - Activate Call Forwarding No Answer
4*93#             - Deactivate Call Forwarding No Answer
5*90<ForwardToNumber>#  - Activate Call Forwarding Busy
6*91#             - Deactivate Call Forwarding Busy

1#Simulating USSD code execution (Illustrative Only, doesn't directly work this way)
2
3def simulate_ussd_call_forwarding(ussd_code):
4  if ussd_code.startswith("*72"):
5    number = ussd_code[3:-1]
6    return f"Forwarding all calls to {number}"
7  elif ussd_code == "*73#":
8    return "Deactivating all call forwarding"
9  else:
10    return "Invalid USSD code"
11
12print(simulate_ussd_call_forwarding("*72+15555551212#"))
13print(simulate_ussd_call_forwarding("*73#"))

1# Hypothetical integration with a CRM system when a call is forwarded
2
3def handle_forwarded_call(caller_id, forwarded_to_number, crm_api_key):
4    # Simulate fetching customer data from CRM
5    customer_data = get_customer_data(caller_id, crm_api_key)
6
7    if customer_data:
8        print(f"Forwarded call from {caller_id} to {forwarded_to_number}")
9        print(f"Customer data: {customer_data}")
10        # Further actions could be taken based on the customer data
11    else:
12        print(f"Forwarded call from {caller_id} to {forwarded_to_number}")
13        print("Customer data not found.")
14
15def get_customer_data(caller_id, api_key):
16    # Placeholder function to simulate CRM API call
17    if caller_id == "+15551234567":
18        return {"name": "John Doe", "account_type": "Premium", "last_purchase": "2023-10-26"}
19    else:
20        return None
21
22# Example usage:
23handle_forwarded_call("+15551234567", "+15557654321", "YOUR_CRM_API_KEY")

1[general]
2allow=ulaw
3allow=alaw
4disallow=all
5; Other SIP settings

1# Placeholder for troubleshooting SIP configuration (Illustrative Only)
2
3def check_sip_configuration():
4    # In a real application, you would check SIP settings
5    print("Checking SIP configuration...")
6    print("Verify codecs: ulaw, alaw should be allowed.")
7    print("Check for any conflicting network settings.")
8    return "SIP configuration check complete (Simulated)"
9
10print(check_sip_configuration())