TURN Server
Run your own TURN (RFC 8656) server in Delphi. Allocate relayed transport addresses for clients that cannot establish a peer-to-peer path, with long-term credentials and per-allocation quotas.
Run your own TURN (RFC 8656) server in Delphi. Allocate relayed transport addresses for clients that cannot establish a peer-to-peer path, with long-term credentials and per-allocation quotas.
A self-hosted TURN server — processes Allocate / CreatePermission / ChannelBind / Send / Refresh / Data, manages allocations and bandwidth, validates long-term credentials.
TsgcTURNServer
Windows, macOS, Linux, iOS, Android
Enterprise
Set Port + Realm, supply per-user passwords via OnTURNAuthenticate, Active := True — your server now allocates relays for any RFC 8656 client.
uses
sgcP2P;
var
TURNServer: TsgcTURNServer;
begin
TURNServer := TsgcTURNServer.Create(nil);
TURNServer.Port := 3478;
TURNServer.Realm := 'turn.example.com';
TURNServer.OnTURNAuthenticate := procedure(Sender: TObject;
const aUsername: string; var aPassword: string;
var Accept: Boolean)
begin
aPassword := LookupPassword(aUsername);
Accept := aPassword <> '';
end;
TURNServer.Active := True;
end;// uses: sgcP2P
TsgcTURNServer *TURNServer = new TsgcTURNServer(this);
TURNServer->Port = 3478;
TURNServer->Realm = "turn.example.com";
TURNServer->Active = true;A self-hosted relay — lets your WebRTC and ICE deployments stop depending on third-party TURN providers.
Honours Allocate requests with REQUESTED-TRANSPORT, picks a free relay port and tracks lifetime. Refresh extends the allocation; the server tears it down on expiry.
Tracks per-allocation peer permissions and channel bindings. Drops Send/Data frames for peers that have not been permissioned per RFC 8656 §9.
Both 36-byte Send / Data envelopes and 4-byte ChannelData frames are supported. The relay forwards datagrams between the relayed-transport-address and the bound peer.
OnTURNAuthenticate exposes the username; you return the password — the server validates MESSAGE-INTEGRITY and rotates nonces automatically.
Set Quota.MaxAllocationsPerUser, Quota.MaxBandwidthKbps, Quota.AllocationLifetime to bound abuse. OnQuotaExceeded reports rejections.
Toggle the underlying server's transport — UDP, TCP and TLS over TCP are all supported. WebRTC clients pick whichever traverses their NAT.
Deep-link to the component reference, grab the ready-to-run demo project, and download the trial.
| Online Help — TsgcTURNServer Full property, method and event reference for this component. | Open | |
| Demo Project — Demos\35.P2P\03.TURN Ready-to-run example project. Ships inside the sgcWebSockets package — download the trial below. | Open | |
| Technical Document (PDF) Features, quick start, code samples for Delphi & C++ Builder and primary-source references — this component only. | Open | |
| User Manual (PDF) Comprehensive manual covering every component in the library. | Open |
Common questions about running a self-hosted TURN relay in Delphi and C++ Builder.
TsgcTURNServer component, set Port and Realm, supply per-user passwords from the OnTURNAuthenticate event, then set Active := True. The server then handles Allocate, CreatePermission, ChannelBind, Send, Refresh and Data for any RFC 8656 client, relaying datagrams between the relayed transport address and the bound peer.TsgcTURNServer is a self-hosted relay you embed in your own Delphi or C++ Builder application, so your WebRTC and ICE deployments can stop depending on third-party TURN providers or a separate coturn install. Per-allocation quotas (max allocations per user, bandwidth and lifetime) bound abuse, with OnQuotaExceeded reporting rejections.