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Discover how to reject outgoing calls and detect call cancellations in `SIP Sorcery` using C# . Learn to utilize specific events for effective VoIP communication.
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This video is based on the question https://stackoverflow.com/q/75916447/ asked by the user 'Smit Rathod' ( https://stackoverflow.com/u/20782082/ ) and on the answer https://stackoverflow.com/a/75916476/ provided by the user 'Ganesh Nemade' ( https://stackoverflow.com/u/3991984/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Handling Call Rejections in SIP Sorcery with C# : A Comprehensive Guide

In today's digital world, Voice over Internet Protocol (VoIP) has transformed how we communicate. While using libraries like SIP Sorcery to manage calls can be straightforward, certain scenarios, such as rejecting calls or detecting when calls are canceled, often raise questions for developers. Let's dive into these common issues faced when using SIP Sorcery in C# and explore how they can be effectively addressed.

Understanding the Problem

When implementing VoIP solutions, developers often need to manage situations where calls must be rejected or canceled. These situations can arise for various reasons—perhaps an endpoint is busy, or the server has specific conditions that necessitate the rejection of a call. Understanding how to reject an outgoing call programmatically and how the receiver can detect this action is crucial for developing robust VoIP applications.

The Key Questions

In our scenario, we need to figure out:

How can the server reject or cancel an outgoing call?

How can the receiver detect that the server has rejected or canceled the call?

Solution Breakdown

Let’s delve into the solution, breaking it down into clear, actionable steps.

1. Rejecting or Canceling an Outgoing Call

To reject an outgoing call on the server side, you can use the HangUp method of the SIPUserAgent instance:

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This single line of code elegantly handles the rejection or cancellation of the call.

2. Detecting Call Rejection on the Receiver Side

To ensure that the receiver is informed when a call has been rejected, you need to subscribe to specific events provided by the SIPUserAgent. Here are the two primary events to listen to:

a. OnCallRejected Event

You can subscribe to the OnCallRejected event, which is triggered when a call is rejected by the server:

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By placing your logic within this event handler, you can take appropriate actions based on the rejection.

b. OnCallTerminated Event

Similarly, the OnCallTerminated event is fired when a call is canceled by the server. You can use this event to handle any necessary cleanup or notification of the call termination:

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Important Notes on Library Versions

It’s worth noting that the OnCallRejected and OnCallTerminated events were introduced in version 7.0.0 of the SIP Sorcery library. If you are working with an older version, you can use the CallHungup method as follows:

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This method provides similar functionality to detect call termination, albeit with a slightly different handling mechanism.

Conclusion

Navigating call rejection and cancellation in SIP Sorcery can initially seem daunting, but by using the provided methods and events effectively, you can create a responsive and user-friendly VoIP application. Whether you're new to SIP Sorcery or looking to enhance your existing implementations, understanding these components is essential for managing your VoIP callbacks robustly.

As you implement these solutions, remember to keep your library version in mind and update to the latest version whenever possible to take advantage of new features and improvements. Happy coding!