SIP
Mock 180 Ringing Response
The UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end.
View full reference →1 HTTP Response
HTTP/1.1 180 Ringing Content-Type: application/json Date: Tue, 25 Feb 2026 12:00:00 GMT
2 Test with curl
curl -i https://httpbin.org/status/180
3 Return 180 Ringing in Your Framework
django
from django.http import HttpResponse
def my_view(request):
return HttpResponse(status=180) # Ringing
flask
from flask import Flask
app = Flask(__name__)
@app.route("/endpoint")
def my_endpoint():
return "", 180 # Ringing
fastapi
from fastapi import FastAPI
from fastapi.responses import Response
app = FastAPI()
@app.get("/endpoint")
def my_endpoint():
return Response(status_code=180) # Ringing
express.js
// Express.js
app.get('/endpoint', (req, res) => {
res.sendStatus(180); // Ringing
});
spring boot
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;
@RestController
public class MyController {
@GetMapping("/endpoint")
public ResponseEntity<Void> myEndpoint() {
return ResponseEntity
.status(180) // Ringing
.build();
}
}
go net/http
package main
import "net/http"
func myHandler(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(180) // Ringing
}
ruby on rails
class MyController < ApplicationController
def my_action
head :ringing
end
end
asp.net core
// ASP.NET Core Minimal API
app.MapGet("/endpoint", () =>
Results.StatusCode(180) // Ringing
);