diff --git a/webrtc/src/opcodes/SelectProtocol.ts b/webrtc/src/opcodes/SelectProtocol.ts
new file mode 100644
index 00000000..dc9d2b88
--- /dev/null
+++ b/webrtc/src/opcodes/SelectProtocol.ts
@@ -0,0 +1,150 @@
+import { WebSocket } from "@fosscord/gateway";
+import { Payload } from "./index";
+import { VoiceOPCodes } from "@fosscord/util";
+import { Server } from "../Server";
+import * as mediasoup from "mediasoup";
+import { RtpCodecCapability } from "mediasoup/node/lib/RtpParameters";
+import * as sdpTransform from 'sdp-transform';
+
+
+/*
+
+ Sent by client:
+{
+ "op": 1,
+ "d": {
+ "protocol": "webrtc",
+ "data": "
+ a=extmap-allow-mixed
+ a=ice-ufrag:vNxb
+ a=ice-pwd:tZvpbVPYEKcnW0gGRPq0OOnh
+ a=ice-options:trickle
+ a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
+ a=extmap:2 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
+ a=extmap:3 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
+ a=extmap:4 urn:ietf:params:rtp-hdrext:sdes:mid
+ a=rtpmap:111 opus/48000/2
+ a=extmap:14 urn:ietf:params:rtp-hdrext:toffset
+ a=extmap:13 urn:3gpp:video-orientation
+ a=extmap:5 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay
+ a=extmap:6 http://www.webrtc.org/experiments/rtp-hdrext/video-content-type
+ a=extmap:7 http://www.webrtc.org/experiments/rtp-hdrext/video-timing
+ a=extmap:8 http://www.webrtc.org/experiments/rtp-hdrext/color-space
+ a=extmap:10 urn:ietf:params:rtp-hdrext:sdes:rtp-stream-id
+ a=extmap:11 urn:ietf:params:rtp-hdrext:sdes:repaired-rtp-stream-id
+ a=rtpmap:96 VP8/90000
+ a=rtpmap:97 rtx/90000
+ ",
+ "codecs": [
+ {
+ "name": "opus",
+ "type": "audio",
+ "priority": 1000,
+ "payload_type": 111,
+ "rtx_payload_type": null
+ },
+ {
+ "name": "H264",
+ "type": "video",
+ "priority": 1000,
+ "payload_type": 102,
+ "rtx_payload_type": 121
+ },
+ {
+ "name": "VP8",
+ "type": "video",
+ "priority": 2000,
+ "payload_type": 96,
+ "rtx_payload_type": 97
+ },
+ {
+ "name": "VP9",
+ "type": "video",
+ "priority": 3000,
+ "payload_type": 98,
+ "rtx_payload_type": 99
+ }
+ ],
+ "rtc_connection_id": "3faa0b80-b3e2-4bae-b291-273801fbb7ab"
+ }
+}
+
+Sent by server:
+
+{
+ "op": 4,
+ "d": {
+ "video_codec": "H264",
+ "sdp": "
+ m=audio 50001 ICE/SDP
+ a=fingerprint:sha-256 4A:79:94:16:44:3F:BD:05:41:5A:C7:20:F3:12:54:70:00:73:5D:33:00:2D:2C:80:9B:39:E1:9F:2D:A7:49:87
+ c=IN IP4 109.200.214.158
+ a=rtcp:50001
+ a=ice-ufrag:CLzn
+ a=ice-pwd:qEmIcNwigd07mu46Ok0XCh
+ a=fingerprint:sha-256 4A:79:94:16:44:3F:BD:05:41:5A:C7:20:F3:12:54:70:00:73:5D:33:00:2D:2C:80:9B:39:E1:9F:2D:A7:49:87
+ a=candidate:1 1 UDP 4261412862 109.200.214.158 50001 typ host
+ ",
+ "media_session_id": "807955cb953e98c5b90704cf048e81ec",
+ "audio_codec": "opus"
+ }
+}
+
+*/
+
+
+export async function onSelectProtocol(this: Server, socket: WebSocket, data: Payload) {
+ const rtpCapabilities = this.mediasoupRouters[0].rtpCapabilities;
+ const codecs = rtpCapabilities.codecs as RtpCodecCapability[];
+
+ const transport = this.mediasoupTransports[0]; //whatever
+
+ const res = sdpTransform.parse(data.d.sdp);
+
+ const videoCodec = this.mediasoupRouters[0].rtpCapabilities.codecs!.find((x: any) => x.kind === "video");
+ const audioCodec = this.mediasoupRouters[0].rtpCapabilities.codecs!.find((x: any) => x.kind === "audio");
+
+ const producer = this.mediasoupProducers[0] || await transport.produce({
+ kind: "audio",
+ rtpParameters: {
+ mid: "audio",
+ codecs: [{
+ clockRate: audioCodec!.clockRate,
+ payloadType: audioCodec!.preferredPayloadType as number,
+ mimeType: audioCodec!.mimeType,
+ channels: audioCodec?.channels,
+ }],
+ headerExtensions: res.ext?.map(x => ({
+ id: x.value,
+ uri: x.uri,
+ })),
+ },
+ paused: false,
+ });
+
+ console.log("can consume: " + this.mediasoupRouters[0].canConsume({ producerId: producer.id, rtpCapabilities: rtpCapabilities }));
+
+ const consumer = this.mediasoupConsumers[0] || await transport.consume({
+ producerId: producer.id,
+ paused: false,
+ rtpCapabilities,
+ });
+
+ socket.send(JSON.stringify({
+ op: VoiceOPCodes.SESSION_DESCRIPTION,
+ d: {
+ video_codec: videoCodec?.mimeType?.substring(6) || undefined,
+ mode: "xsalsa20_poly1305_lite",
+ media_session_id: transport.id,
+ audio_codec: audioCodec?.mimeType.substring(6),
+ sdp: `m=audio ${transport.iceCandidates[0].port} ICE/SDP\n`
+ + `a=fingerprint:sha-256 ${transport.dtlsParameters.fingerprints.find(x => x.algorithm === "sha-256")?.value}\n`
+ + `c=IN IPV4 ${transport.iceCandidates[0].ip}\n`
+ + `a=rtcp: ${transport.iceCandidates[0].port}\n`
+ + `a=ice-ufrag:${transport.iceParameters.usernameFragment}\n`
+ + `a=ice-pwd:${transport.iceParameters.password}\n`
+ + `a=fingerprint:sha-1 ${transport.dtlsParameters.fingerprints[0].value}\n`
+ + `a=candidate:1 1 ${transport.iceCandidates[0].protocol} ${transport.iceCandidates[0].priority} ${transport.iceCandidates[0].ip} ${transport.iceCandidates[0].port} typ ${transport.iceCandidates[0].type}`
+ }
+ }));
+}
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