The long-term credential mechanism relies on a long-term credential, in the form of a username and password that are shared between client and server. The credential is considered long-term since it is assumed that it is provisioned for a user and remains in effect until the user is no longer a subscriber of the system or until it is changed.
You can configure the Long-term credentials in the sgcWebSockets STUN client using the following code.
TsgcSTUNClient oSTUN = new TsgcSTUNClient();
oSTUN.Host = "stun.sgcwebsockets.com";
oSTUN.Port = 3478;
oSTUN.STUNOptions.Authentication.Credentials = TsgcStunCredentials.stauLongTermCredential;
oSTUN.STUNOptions.Authentication.Username = "user_name";
oSTUN.STUNOptions.Authentication.Password = "secret";
oSTUN.SendRequest();
If server requires long-term credentials and the credentials sent by the client are wrong, the will receive a 401 Unauthorized error as a response in the OnSTUNResponseError event.