AddTapi.NET has everything you need to develop telephony applications. Just take a look at some of AddTapi.NET features:

• Monitor incoming and outgoing calls.
  AddTapi.NET monitors incoming and outgoing calls and notifies your application when a new call is received, when a connection to the remote party is established, when a call is disconnected and so on. AddTapi.NET supplies all information needed to develop call monitoring and logging applications.
• Answer incoming calls automatically or on request.
  AddTapi.NET can answer incoming calls automatically after specified number of rings. If you do not need to answer all incoming calls automatically, your application can receive incoming call notifications and decide whether to answer the call or not.
• Support multiple lines.
  AddTapi.NET programming model helps you easily develop scalable applications that work well with any number of lines. You won't believe how easy it is to write multi-line applications with AddTapi.NET until you download the demo version and try it yourself.
• Play audio files.
  AddTapi.NET can play audio files over the phone. AddTapi.NET supports all wave (.wav) files that can be played in Windows, including compressed formats for which the codecs are installed.
• Obtain Caller ID and Called ID.
  AddTapi.NET can obtain caller's name and number on incoming calls. It can also provide called party's name and number if supported by the telephony hardware.
• Speak text using TTS (Text-To-Speech) synthesis.
  AddTapi.NET can "speak" text over the phone using text synthesis. AddTapi.NET supports Microsoft SAPI 5.0 and can use any SAPI-compatible Text-To-Speech engine.
• Make outgoing calls.
  Using AddTapi.NET your application can make outgoing calls. AddTapi.NET detects when a call is answered and reports if there was no answer or the number was busy.
• Detect DTMF digits.
  AddTapi.NET can detect DTMF digits on the line allowing you implement touch-tone menus. AddTapi.NET makes it easy to gather a string of digits such as a pin code or an account number.
• Send DTMF digits.
  With AddTapi.NET your application can generate DTMF digits to control a PBX or navigate a touch-tone menu.
• Record call audio.
  AddTapi.NET can record audio from phone line to a wave (.wav) file. Other telephony operations such as DTMF detection can be performed while recording is in progress.
• Transfer calls.
  AddTapi.NET can transfer calls to another extension or another number if this feature is supported by your telephony hardware.
• Put calls on hold.
  AddTapi.NET can put calls on hold and retrieve held calls. While the call is on hold the application can use the line for making or answering other calls.
• Detect telephony devices added/removed at runtime.
  AddTapi.NET detects when a new telephony device is connected or becomes available, allowing your application to work with it right away without restarting the application. Your application is also notified when device is removed from the system or becomes unavailable.

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