基于Ozeki VoIP SDK的技术咨询：希伯来语语音合成与按键事件捕获

Hey there! Let's break down your two technical questions about integrating with the Ozeki VoIP SDK one by one:

1. Text-to-Speech for Hebrew in C# (or other languages) #

Absolutely, you can implement Hebrew text-to-speech (TTS) in C# alongside the Ozeki SDK. Here's a practical approach:

• First, check if Ozeki's built-in TTS supports Hebrew. If it doesn't (which is common for less widely supported languages out of the box), pair Ozeki with .NET's native System.Speech.Synthesis.SpeechSynthesizer class.
• You'll need to install a Hebrew TTS voice pack on your system (like Microsoft's Hebrew speech engine, available via Windows Settings > Time & Language > Speech).
• Once the voice is available, generate the Hebrew audio stream and pass it to Ozeki's audio sender to transmit over the SIP call. Here's a quick code snippet to illustrate:

using System.Speech.Synthesis;
using Ozeki.VoIP;
using System.IO;

// Initialize TTS engine
var synthesizer = new SpeechSynthesizer();
// Select Hebrew voice (adjust the voice name based on your installed pack)
synthesizer.SelectVoiceByHints(VoiceGender.Neutral, VoiceAge.Adult, 0, new System.Globalization.CultureInfo("he-IL"));

// Generate audio stream from Hebrew text
var audioStream = new MemoryStream();
synthesizer.SetOutputToWaveStream(audioStream);
synthesizer.Speak("שלום, זה טקסט לדיבור בעברית"); // Hebrew text
audioStream.Position = 0;

// Pass the stream to Ozeki's audio provider for SIP transmission
var audioProvider = new WaveStreamAudioProvider(audioStream);
call.AudioSender.AttachAudioProvider(audioProvider);

For other languages like Python, use a TTS library that supports Hebrew (e.g., gTTS) and convert the output to a format compatible with Ozeki's audio handling.

2. Retrieving DTMF Keypress Information #

Yes, the Ozeki VoIP SDK has built-in support for detecting DTMF tones, so you can easily capture the exact keys a user presses. Here's how to set it up:

• When a SIP call is established, subscribe to the DTMFReceived event on the ICall object. This event triggers every time a DTMF tone is detected.
• In the event handler, access the pressed key via the event arguments. Here's a code example:

using Ozeki.VoIP;

// After establishing a call
call.DTMFReceived += Call_DTMFReceived;

private void Call_DTMFReceived(object sender, DTMFEventArgs e)
{
    // Get the pressed key (supports 0-9, *, #)
    var pressedKey = e.DTMF.ToString();
    Console.WriteLine($"User pressed: {pressedKey}");
    
    // Add custom logic here, like routing the call based on the key pressed
}

This works for both inbound and outbound calls, as long as the SIP endpoint sends DTMF tones in a format Ozeki recognizes (most standard setups use RFC 2833 or in-band DTMF, both supported by Ozeki).

内容的提问来源于stack exchange，提问作者esterr