diff --git a/tests/unit/test_plugin_xep_0176.py b/tests/unit/test_plugin_xep_0176.py
new file mode 100644
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+++ b/tests/unit/test_plugin_xep_0176.py
@@ -0,0 +1,300 @@
+#!/usr/bin/env python3
+
+# Libervia: an XMPP client
+# Copyright (C) 2009-2023 Jérôme Poisson (goffi@goffi.org)
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from unittest.mock import AsyncMock, MagicMock
+
+from pytest import fixture
+from pytest_twisted import ensureDeferred as ed
+
+from sat.plugins.plugin_xep_0166 import XEP_0166
+from sat.plugins.plugin_xep_0176 import NS_JINGLE_ICE_UDP, XEP_0176
+from sat.tools import xml_tools
+
+
+@fixture(autouse=True)
+def no_transport_register(monkeypatch):
+    """Do not register the transport in XEP-0166"""
+    monkeypatch.setattr(XEP_0166, "register_transport", lambda *a, **kw: None)
+
+
+class TestXEP0176:
+    def create_mock_session(self, content_name):
+        return {
+            "id": "test-session-id",
+            "contents": {
+                content_name: {
+                    "application_data": {"media": "audio"},
+                    "transport_data": {
+                        "local_ice_data": {
+                            "ufrag": "testufrag",
+                            "pwd": "testpwd",
+                            "candidates": [
+                                {
+                                    "id": "candidate_1",
+                                    "component_id": 1,
+                                    "foundation": "1",
+                                    "address": "192.0.2.1",
+                                    "port": 1234,
+                                    "priority": 1,
+                                    "transport": "udp",
+                                    "type": "host",
+                                }
+                            ],
+                        }
+                    },
+                }
+            },
+        }
+
+    def test_build_transport(self, host, monkeypatch):
+        """ICE data is correctly transformed into transport element"""
+        xep_0176 = XEP_0176(host)
+
+        ice_data = {
+            "ufrag": "user1",
+            "pwd": "password1",
+            "candidates": [
+                {
+                    "component_id": 1,
+                    "foundation": "1",
+                    "address": "192.168.0.1",
+                    "port": 1234,
+                    "priority": 100,
+                    "transport": "udp",
+                    "type": "host",
+                    "generation": "0",
+                    "network": "0",
+                },
+                {
+                    "component_id": 2,
+                    "foundation": "1",
+                    "address": "192.168.0.2",
+                    "port": 5678,
+                    "priority": 100,
+                    "transport": "udp",
+                    "type": "host",
+                    "generation": "0",
+                    "network": "0",
+                    "rel_addr": "10.0.0.1",
+                    "rel_port": 9012,
+                },
+            ],
+        }
+
+        transport_elt = xep_0176.build_transport(ice_data)
+
+        assert transport_elt.name == "transport"
+        assert transport_elt.uri == NS_JINGLE_ICE_UDP
+        assert transport_elt.getAttribute("ufrag") == "user1"
+        assert transport_elt.getAttribute("pwd") == "password1"
+
+        candidates = list(transport_elt.elements(NS_JINGLE_ICE_UDP, "candidate"))
+
+        assert len(candidates) == len(ice_data["candidates"])
+
+        for i, candidate_elt in enumerate(candidates):
+            ice_candidate = ice_data["candidates"][i]
+            assert (
+                int(candidate_elt.getAttribute("component"))
+                == ice_candidate["component_id"]
+            )
+            assert candidate_elt.getAttribute("foundation") == ice_candidate["foundation"]
+            assert candidate_elt.getAttribute("ip") == ice_candidate["address"]
+            assert int(candidate_elt.getAttribute("port")) == ice_candidate["port"]
+            assert (
+                int(candidate_elt.getAttribute("priority")) == ice_candidate["priority"]
+            )
+            assert candidate_elt.getAttribute("protocol") == ice_candidate["transport"]
+            assert candidate_elt.getAttribute("type") == ice_candidate["type"]
+            assert candidate_elt.getAttribute("generation") == str(
+                ice_candidate.get("generation", "0")
+            )
+            assert candidate_elt.getAttribute("network") == str(
+                ice_candidate.get("network", "0")
+            )
+
+            if "rel_addr" in ice_candidate:
+                assert candidate_elt.getAttribute("rel-addr") == ice_candidate["rel_addr"]
+                assert (
+                    int(candidate_elt.getAttribute("rel-port"))
+                    == ice_candidate["rel_port"]
+                )
+            else:
+                assert candidate_elt.getAttribute("rel-addr") is None
+                assert candidate_elt.getAttribute("rel-port") is None
+
+    def test_parse_transport(self, host):
+        """Transport element is correctly parsed into ICE data"""
+        xep_0176 = XEP_0176(host)
+
+        transport_elt = xml_tools.parse(
+            """
+            <transport xmlns="urn:xmpp:jingle:transports:ice-udp:1"
+                       pwd="password1"
+                       ufrag="user1">
+                <candidate component="1"
+                           foundation="1"
+                           generation="0"
+                           id="uuid1"
+                           ip="192.168.0.1"
+                           network="0"
+                           port="1234"
+                           priority="100"
+                           protocol="udp"
+                           type="host" />
+                <candidate component="2"
+                           foundation="1"
+                           generation="0"
+                           id="uuid2"
+                           ip="192.168.0.2"
+                           network="0"
+                           port="5678"
+                           priority="100"
+                           protocol="udp"
+                           type="host"
+                           rel-addr="10.0.0.1"
+                           rel-port="9012" />
+            </transport>
+            """
+        )
+
+        ice_data = xep_0176.parse_transport(transport_elt)
+
+        assert transport_elt.getAttribute("ufrag") == "user1"
+        assert transport_elt.getAttribute("pwd") == "password1"
+
+        candidates = list(transport_elt.elements(NS_JINGLE_ICE_UDP, "candidate"))
+        assert len(candidates) == len(ice_data["candidates"])
+
+        for i, candidate_elt in enumerate(candidates):
+            ice_candidate = ice_data["candidates"][i]
+            assert (
+                int(candidate_elt.getAttribute("component"))
+                == ice_candidate["component_id"]
+            )
+            assert candidate_elt.getAttribute("foundation") == ice_candidate["foundation"]
+            assert candidate_elt.getAttribute("ip") == ice_candidate["address"]
+            assert int(candidate_elt.getAttribute("port")) == ice_candidate["port"]
+            assert (
+                int(candidate_elt.getAttribute("priority")) == ice_candidate["priority"]
+            )
+            assert candidate_elt.getAttribute("protocol") == ice_candidate["transport"]
+            assert candidate_elt.getAttribute("type") == ice_candidate["type"]
+            assert candidate_elt.getAttribute("generation") == str(
+                ice_candidate.get("generation", "0")
+            )
+            assert candidate_elt.getAttribute("network") == str(
+                ice_candidate.get("network", "0")
+            )
+
+            if "rel_addr" in ice_candidate:
+                assert candidate_elt.getAttribute("rel-addr") == ice_candidate["rel_addr"]
+                assert (
+                    int(candidate_elt.getAttribute("rel-port"))
+                    == ice_candidate["rel_port"]
+                )
+            else:
+                assert candidate_elt.getAttribute("rel-addr") is None
+                assert candidate_elt.getAttribute("rel-port") is None
+
+    @ed
+    async def test_jingle_session_init(self, host, client):
+        """<transport/> element is built on initiator side during init"""
+        xep_0176 = XEP_0176(host)
+
+        content_name = "test-content"
+        session = self.create_mock_session(content_name)
+
+        transport_elt = await xep_0176.jingle_session_init(client, session, content_name)
+
+        expected_transport_elt = xep_0176.build_transport(
+            session["contents"][content_name]["transport_data"]["local_ice_data"]
+        )
+
+        assert transport_elt.toXml() == expected_transport_elt.toXml()
+
+    @ed
+    async def test_jingle_handler(self, host, client):
+        """<transport/> element is built on responder side during init"""
+        xep_0176 = XEP_0176(host)
+
+        content_name = "test-content"
+        action = "session-initiate"
+        session = self.create_mock_session(content_name)
+        transport_elt = xml_tools.parse("<transport/>")
+
+        returned_transport_elt = await xep_0176.jingle_handler(
+            client, action, session, content_name, transport_elt
+        )
+
+        expected_transport_elt = xep_0176.build_transport(
+            session["contents"][content_name]["transport_data"]["local_ice_data"]
+        )
+
+        assert returned_transport_elt.toXml() == expected_transport_elt.toXml()
+
+    @ed
+    async def test_ice_candidates_add(self, host, client):
+        """local new ICE candidates are added, IQ is sent, bridge signal emitted"""
+        xep_0176 = XEP_0176(host)
+
+        content_name = "test-content"
+        session_id = "test-session-id"
+        media_ice_data_s = {
+            "audio": {
+                # we use different "ufrag" and "pwd" than in "create_mock_session" to
+                # trigger an ICE restart
+                "ufrag": "new_testufrag",
+                "pwd": "new_testpwd",
+                "candidates": [
+                    {
+                        "component_id": 2,
+                        "foundation": "2",
+                        "address": "192.0.2.2",
+                        "port": 1235,
+                        "priority": 2,
+                        "transport": "udp",
+                        "type": "host",
+                    }
+                ],
+            }
+        }
+
+        mock_session = self.create_mock_session(content_name)
+        xep_0176._j.get_session = MagicMock(return_value=mock_session)
+        xep_0176._j.build_action = MagicMock()
+        iq_elt = AsyncMock()
+        xep_0176._j.build_action.return_value = (iq_elt, None)
+        xep_0176.host.bridge.ice_restart = MagicMock()
+
+        await xep_0176.ice_candidates_add(client, session_id, media_ice_data_s)
+
+        xep_0176._j.build_action.assert_called()
+        iq_elt.send.assert_called()
+        xep_0176.host.bridge.ice_restart.assert_called()
+
+        # Checking that local ICE data is updated correctly
+        updated_local_ice_data = mock_session["contents"][content_name]["transport_data"][
+            "local_ice_data"
+        ]
+        assert updated_local_ice_data["ufrag"] == "new_testufrag"
+        assert updated_local_ice_data["pwd"] == "new_testpwd"
+        assert (
+            updated_local_ice_data["candidates"]
+            == media_ice_data_s["audio"]["candidates"]
+        )