diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f539813
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+venv
+ovh.conf
+__pycache__
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..e010821
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,16 @@
+---
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.2.0
+    hooks:
+      - id: check-executables-have-shebangs
+      - id: check-merge-conflict
+      - id: end-of-file-fixer
+      - id: fix-encoding-pragma
+        args: ['--remove']
+      - id: requirements-txt-fixer
+      - id: trailing-whitespace
+  - repo: https://github.com/psf/black
+    rev: 22.3.0
+    hooks:
+      - id: black
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9c8aafa
--- /dev/null
+++ b/README.md
@@ -0,0 +1,36 @@
+# OVHcloud Nagios collection
+
+Nagios checks for [OVHcloud](https://www.ovhcloud.com) services.
+
+# Installation
+
+Using pip:
+
+```
+python3 -m venv venv
+. ./venv/bin/activate
+pip install -r requirements.txt
+```
+
+Create OVHcloud API tokens following [this guide](https://github.com/ovh/python-ovh).
+
+# check_voip
+
+For each VoIP lines associated to the account, detect the last registration time:
+
+```
+./check_voip --help
+```
+
+Example of configuration:
+
+```
+command[check_voip]=/opt/check_ovhcloud/check_voip -w 7200 -c 86400
+```
+
+# Contributing
+
+```
+pip install pre-commit
+pre-commit run --files check_*
+```
diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..3eefcb9
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+1.0.0
diff --git a/check_voip b/check_voip
new file mode 100755
index 0000000..4c346b6
--- /dev/null
+++ b/check_voip
@@ -0,0 +1,139 @@
+#!/usr/bin/env python3
+
+import argparse
+import logging
+import sys
+import ovh
+from datetime import datetime, timezone
+
+from lib import setup_logging, show_version
+
+from nagiosplugin import (
+    Check,
+    Metric,
+    Resource,
+    ScalarContext,
+    Summary,
+)
+from nagiosplugin.state import Critical, Ok, Unknown, Warn
+
+logger = logging.getLogger(__name__)
+
+
+def parse_arguments():
+    parser = argparse.ArgumentParser()
+    parser.add_argument(
+        "-v",
+        "--verbose",
+        dest="loglevel",
+        action="store_const",
+        const=logging.INFO,
+        help="Print more output",
+    )
+    parser.add_argument(
+        "-d",
+        "--debug",
+        dest="loglevel",
+        action="store_const",
+        const=logging.DEBUG,
+        default=logging.WARNING,
+        help="Print even more output",
+    )
+
+    parser.add_argument(
+        "--version",
+        dest="show_version",
+        action="store_true",
+        help="Print version and exit",
+    )
+
+    parser.add_argument(
+        "--registration-warning",
+        "-w",
+        dest="registration_warning",
+        type=int,
+        default=7200,
+        help="Raise warning if last line registration time is higher than this threshold (in seconds)",
+    )
+
+    parser.add_argument(
+        "--registration-critical",
+        "-c",
+        dest="registration_critical",
+        type=int,
+        default=86400,
+        help="Raise critical if last line registration time is higher than this threshold (in seconds)",
+    )
+
+    args = parser.parse_args()
+    return args
+
+
+class Voip(Resource):
+    def __init__(self, client):
+        self.client = client
+
+    def probe(self):
+        metrics = []
+        billing_accounts = self.client.get(f"/telephony")
+        for billing_account in billing_accounts:
+            service_names = self.client.get(f"/telephony/{billing_account}/line")
+            for service_name in service_names:
+                last_registration = self.client.get(
+                    f"/telephony/{billing_account}/line/{service_name}/lastRegistrations"
+                )[0]
+                last_registration_delta = int(
+                    (
+                        datetime.now(tz=timezone.utc)
+                        - datetime.fromisoformat(last_registration["datetime"])
+                    ).total_seconds()
+                )
+                metrics.append(
+                    Metric(
+                        f"{service_name} last registration",
+                        last_registration_delta,
+                        context="last_registration",
+                        uom="s",
+                    )
+                )
+        return metrics
+
+
+class VoipSummary(Summary):
+    def problem(self, results):
+        return ", ".join(
+            [
+                f"{result.metric.name} {result.state}: {result.hint}"
+                for result in results
+                if str(result.state) != "ok"
+            ]
+        )
+
+
+def main():
+    args = parse_arguments()
+    setup_logging(args)
+
+    if args.show_version:
+        show_version()
+        return
+
+    try:
+        check = Check(
+            Voip(client=ovh.Client()),
+            ScalarContext(
+                "last_registration",
+                warning=args.registration_warning,
+                critical=args.registration_critical,
+            ),
+            VoipSummary(),
+        )
+        check.main()
+    except Exception as err:
+        print(f"Failed to execute check: {str(err)}")
+        logger.debug(err, exc_info=True)
+        sys.exit(Unknown.code)
+
+
+if __name__ == "__main__":
+    main()
diff --git a/lib/__init__.py b/lib/__init__.py
new file mode 100644
index 0000000..384feb9
--- /dev/null
+++ b/lib/__init__.py
@@ -0,0 +1,13 @@
+import logging
+import os
+
+
+def show_version():
+    with open(
+        os.path.join(os.path.dirname(os.path.abspath(__file__)), "..", "VERSION"), "r"
+    ) as fd:
+        print(fd.read().strip())
+
+
+def setup_logging(args):
+    logging.basicConfig(format="%(levelname)s: %(message)s", level=args.loglevel)
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..6b2e766
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1,7 @@
+certifi==2023.7.22
+charset-normalizer==3.2.0
+idna==3.4
+nagiosplugin==1.3.3
+ovh==1.1.0
+requests==2.31.0
+urllib3==2.0.5