adding in a trivial opus example

trivialexample/default_bus_layout.tres

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+[gd_resource type="AudioBusLayout" load_steps=2 format=3 uid="uid://ceqh8sdin07i8"]
+
+[sub_resource type="AudioEffectOpusChunked" id="AudioEffectOpusChunked_lwptv"]
+resource_name = "OpusChunked"
+
+[resource]
+bus/1/name = &"Mic"
+bus/1/solo = false
+bus/1/mute = true
+bus/1/bypass_fx = false
+bus/1/volume_db = 0.0
+bus/1/send = &"Master"
+bus/1/effect/0/effect = SubResource("AudioEffectOpusChunked_lwptv")
+bus/1/effect/0/enabled = true

trivialexample/main.gd

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+extends Node
+
+@export var SERVER_URL = "127.0.0.1"
+@export var SERVER_PORT = 8009
+
+var user = load("res://user.tscn")
+
+var mic_capture : AudioEffectOpusChunked
+
+var users = {} # {Peer ID: AudioStreamPlayer}
+
+var packets_received = 0
+var packets_sent = 0
+
+func _ready():
+	multiplayer.peer_connected.connect(_peer_connected)
+	multiplayer.peer_disconnected.connect(_peer_disconnected)
+	multiplayer.connected_to_server.connect(_connected_to_server)
+	multiplayer.connection_failed.connect(_connection_failed)
+	multiplayer.server_disconnected.connect(_server_disconnected)
+
+	var mic_bus = AudioServer.get_bus_index("Mic")
+	mic_capture = AudioServer.get_bus_effect(mic_bus, 0)
+
+	var peer = ENetMultiplayerPeer.new()
+	var err = peer.create_server(SERVER_PORT)
+	if err == ERR_ALREADY_IN_USE or err == ERR_CANT_CREATE:
+		peer.close()
+		err = peer.create_client(SERVER_URL, SERVER_PORT)
+		print("Created client ", ("Error %d" % err if err else ""))
+	else:
+		print("Created server ", ("Error %d" % err if err else ""))
+		set_process(false)
+	multiplayer.multiplayer_peer = peer
+
+func _peer_connected(id):
+	print("Peer connected with ID ", id)
+	users[id] = user.instantiate()
+	add_child(users[id])
+
+func _peer_disconnected(id):
+	print("Peer disconnected with ID ", id)
+	users[id].queue_free()
+	users.erase(id)
+
+func _connected_to_server():
+	print("Connected to server ", SERVER_URL, ":", SERVER_PORT)
+
+func _connection_failed():
+	print("Failed to connect to server ", SERVER_URL, ":", SERVER_PORT)
+
+func _server_disconnected():
+	print("Server disconnected.")
+
+@rpc("any_peer", "unreliable")
+func _voice_packet_received(packet):
+	packets_received += 1
+	if (packets_received % 100) == 0:
+		print("Packets received: ", packets_received, " from id ", multiplayer.get_unique_id())
+	var sender_id = multiplayer.get_remote_sender_id()
+	users[sender_id].stream.push_opus_packet(packet, 0, 0)
+
+func _process(_delta):
+	while mic_capture.chunk_available():
+		var packet = mic_capture.read_opus_packet(PackedByteArray())
+		mic_capture.drop_chunk()
+		if multiplayer.multiplayer_peer.get_connection_status() == MultiplayerPeer.CONNECTION_CONNECTED:
+			_voice_packet_received.rpc(packet)
+			packets_sent += 1
+			if (packets_sent % 100) == 0:
+				print("Packets sent: ", packets_sent, " from id ", multiplayer.get_unique_id())

trivialexample/main.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://dpsvywutgtu38"]
+
+[ext_resource type="Script" path="res://main.gd" id="1_0j44c"]
+
+[sub_resource type="AudioStreamMicrophone" id="AudioStreamMicrophone_d5gmj"]
+
+[node name="Node3D" type="Node3D"]
+script = ExtResource("1_0j44c")
+
+[node name="AudioStreamPlayer" type="AudioStreamPlayer" parent="."]
+stream = SubResource("AudioStreamMicrophone_d5gmj")
+autoplay = true

trivialexample/project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="twovoip trivial ENET"
+run/main_scene="res://main.tscn"
+config/features=PackedStringArray("4.3", "GL Compatibility")
+
+[audio]
+
+driver/enable_input=true
+
+[rendering]
+
+renderer/rendering_method="gl_compatibility"
+renderer/rendering_method.mobile="gl_compatibility"

trivialexample/user.tscn

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+[gd_scene load_steps=2 format=3 uid="uid://e8q0gjrr45rq"]
+
+[sub_resource type="AudioStreamOpusChunked" id="AudioStreamOpusChunked_mrrtk"]
+
+[node name="AudioStreamPlayer" type="AudioStreamPlayer"]
+stream = SubResource("AudioStreamOpusChunked_mrrtk")
+autoplay = true