用于发短信，拨打电话的网站接口

云之讯：http://www.ucpaas.com/price

中国网建：http://sms.webchinese.cn/api.shtml 测试的时候发现短信达到延迟太久，没办法使用。

云通讯：http://www.yuntongxun.com/

我使用了云之讯来作为我的通讯第三方，平台提供了详细的接口说明和资费说明。

到他们官网可以下载到C#的demo，在我开发的过程中发现他们的demo缺少了一个语音电话，

根据他们的协议要，写了一个《云之讯语音通知协议》

/// <summary>
/// 电话语言提醒
/// </summary>
/// <param name="toPhone">被叫号码，可以是正常手机号码、固定号码，被叫为座机时需要添加区号，如：075512345678。</param>
/// <param name="toSerNum">语音通知的被叫侧显示的号码。可显示手机号码、400号码或固话。查阅显号规则。</param>
/// <param name="type">内容类型：0：文本；1：语音ID</param>
/// <param name="content">当type为0时：文本内容，平台负责将该内容转成语音，呼通指定号码后，播放该语音文件；当type为1时：表示语音ID（语音文件必须先上传）。</param>
/// <param name="playTimes">循环播放次数，1－3次，默认播放1次。</param>
/// <returns>包体内容</returns>
public string CallUpSomebody( string toPhone, string toSerNum,string type,string content,string playTimes)
{
if (toPhone == null)
{
throw new ArgumentNullException("toPhone");
}

try
{
string date = DateTime.Now.ToString("yyyyMMddHHmmss");

// 构建URL内容
string sigstr = MD5Encrypt(m_mainAccount + m_mainToken + date);
string uriStr;
string xml = (m_bodyType == EBodyType.EType_XML ? ".xml" : "");
uriStr = string.Format("https://{0}:{1}/{2}/Accounts/{3}/Calls/voiceNotify{4}?sig={5}", m_restAddress, m_restPort, softVer, m_mainAccount, xml, sigstr);

Uri address = new Uri(uriStr);

WriteLog("CallBack url = " + uriStr);

// 创建网络请求
HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
setCertificateValidationCallBack();

// 构建Head
request.Method = "POST";

Encoding myEncoding = Encoding.GetEncoding("utf-8");
byte[] myByte = myEncoding.GetBytes(m_mainAccount + ":" + date);
string authStr = Convert.ToBase64String(myByte);
request.Headers.Add("Authorization", authStr);

// 构建Body
StringBuilder data = new StringBuilder();

if (m_bodyType == EBodyType.EType_XML)
{
request.Accept = "application/xml";
request.ContentType = "application/xml;charset=utf-8";

data.Append("<?xml version='1.0' encoding='utf-8'?><voiceNotify>");
data.Append("<appId>").Append(m_appId).Append("</appId>");
data.Append("<to>").Append(toPhone).Append("</to>");
data.Append("<type>").Append(type).Append("</type>");
data.Append("<content>").Append(content).Append("</content>");
data.Append("<toSerNum>").Append(toSerNum).Append("</toSerNum>");
data.Append("<playTimes>").Append(playTimes).Append("</playTimes>");
data.Append("</voiceNotify>");
}
else
{
request.Accept = "application/json";
request.ContentType = "application/json;charset=utf-8";

data.Append("{");
data.Append("\"voiceNotify\":{");
data.Append("\"appId\":\"").Append(m_appId).Append("\"");
data.Append(",\"to\":\"").Append(toPhone).Append("\"");
data.Append(",\"type\":\"").Append(type).Append("\"");
data.Append(",\"content\":\"").Append(content).Append("\"");
data.Append(",\"toSerNum\":\"").Append(toSerNum).Append("\"");
data.Append(",\"playTimes\":\"").Append(playTimes).Append("\"");
data.Append("}}");
}

byte[] byteData = UTF8Encoding.UTF8.GetBytes(data.ToString());

WriteLog("CreateSubAccount requestBody = " + data.ToString());

// 开始请求
using (Stream postStream = request.GetRequestStream())
{
postStream.Write(byteData, 0, byteData.Length);
}

// 获取请求
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
// Get the response stream
StreamReader reader = new StreamReader(response.GetResponseStream());
string responseStr = reader.ReadToEnd();

WriteLog("CreateSubAccount responseBody = " + responseStr);

if (responseStr != null && responseStr.Length > 0)
{
return responseStr;
}
}
return null;
}
catch (Exception e)
{
throw e;
}
}

以上都提供了demo。使用起来比较方便。