Here's an example of how you could implement a REST API using an ODOO controller to retrieve data on a contact when a call is received:

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from odoo import http
import json

class VoipApiController(http.Controller):
@http.route('/voip/call/<string:phone_number>', type='http', auth='none')
def handle_call(self, phone_number, **kwargs):
# retrieve contact data from the database
contact = http.request.env['res.partner'].search([('phone', '=', phone_number)], limit=1)
if contact:
# convert contact data to JSON format
contact_data = json.dumps(contact.read()[0])
return contact_data
else:
return "Contact not found"
In this example, the handle_call method is defined as the endpoint for the API using the @http.route decorator. The phone_number parameter is passed as a path variable in the URL. The method retrieves the contact data from the Odoo database using the http.request.env object, and the json.dumps() method is used to convert the data to a JSON format.

On the other hand, in the VOIP solution application, you could use the JavaScript XMLHttpRequest or fetch() method to send a request to the API endpoint and retrieve the data during a call.

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// using XMLHttpRequest
function getContactData(phoneNumber) {
var xhr = new XMLHttpRequest();
xhr.open('GET', '/voip/call/' + phoneNumber);
xhr.onreadystatechange = function() {
if (xhr.readyState === 4 && xhr.status === 200) {
var contactData = JSON.parse(xhr.responseText);
// do something with the contact data
}
};
xhr.send();
}

// using fetch
async function getContactData(phoneNumber) {
try {
const response = await fetch('/voip/call/' + phoneNumber);
const contactData = await response.json();
// do something with the contact data
} catch (error) {
console.error(error);
}
}
And you can use the window.open() method to open the contact page in the browser during the call.

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window.open("/web#id="+contact.id+"&view_type=form&model=res.partner");
Please note that this is a basic example and you may need to adapt it to your specific use case and add additional error handling and security measures as needed