使用 Twilio 构建一个从电话 A 到电话 B 的呼叫示例

Question

Does anyone know if in Twilio it is possible to mount an application with the following requirements?:

1. From an 'A' telephone, that of the telemarketer or sender, an 'X' telephone of the receiver indicated from the application will be called.

2. The application must be able to intercept if the phone 'X':

   2.1. Does not exist.

   2.2. It exists but communicates.

   2.3. It exists, does not communicate but does not pick up.

   2.4. It exists, does not communicate, picks up and the conversation takes place.

3. If the conversation occurs, detect when it ends.

4. The conversation is recorded.

5. Asynchronously, make a request to Twilio to recover the recording and delete it.

I have been seeing the documentation on their website and I have some doubts:

1. Can it be done from a standalone Java application? Or does it have to be web?.

2. The telephone A sender, how should it be configured from Twilio? (I'm getting involved with the concepts of verified phone, purchased phone, 'webhook', etc).

Can someone point me to an example that does that? I am a bit lost.

Answer 1

I have used twilio a long time ago, but from what I remember :

1. You can record a conversation but I don't think it is free to do so (You have limited storage and need to pay if you want more, I will let you check that one).

2. Twilio will detect when the conversation ends and stop both call.

3. You must be able to recover your recording from a java application.

4. I don't know if you can know all the points from your part 2. there might be some return code from Twilio API that could tell you that but I'm usure about that.

5. Your application will need to use VoIP and have webhooks configured so I'm pretty sure you will need a web app with a certified ssl certificate not a self-signed one otherwise Twilio will not accept the latter and will not let you send messages or calls. For free certified ssl certifcate you can check Let's Encrypt .

6. You can check the the Twilio API documentation , I'm pretty sure you will find a lot more information in there. Regarding your points you might want to focus on the Voice API and the REST API