Hi, I followed the online guide trying to make a outbound call, using "nexmo csharp client3.2.2", but i still got the exception"System.ArgumentException: 'RsaUsingSha alg expects key to be of RSA type". I've already tried the way you mention as post earlier but it didn't work. I'm total clueless now, please help me

[lidondon]

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[smithrobs]

Which target framework(s) of .NET can you reproduce this issue against?

What operating system(s) is exhibiting this issue?

[lidondon]

it's 4.6.1 in win10. Is there anything i should do?

[lidondon]

anther little problem.....i'm curious about the key in the 'private.key' file break line not totally continuous, Client = new Client(creds: new Nexmo.Api.Request.Credentials { ApiKey = "my api key", ApiSecret = "My sceret", ApplicationId = "app id", ApplicationKey=(should i contain -----BEGIN PRIVATE KEY----- and -----END PRIVATE KEY-----) });

[smithrobs]

I would not recommend removing line breaks (I believe doing so does not adhere to specs) and yes, you must include the -----BEGIN PRIVATE KEY----- and -----END PRIVATE KEY-----

[lidondon]

actually, i've tried anything i can imagine, i mean....like include the line breaks, begin and end symbols, 

still getting the same 'RsaUsingSha alg expects key to be of RSA type' exception. i read the post with same issue before, so i copy and paste the content of 'private.key' not give Nexmo.Api.Request.Credentials.ApplicationKey the path of the file. am i correct to do so? i have been stuck here with this issue almost 2days, please help me, thank you sooooooooooooooooo much

[lidondon]

I did it again from the beginning, then i got "System.ArgumentNullException: 'Arg_ParamName_Name'" here's my code below: var results = Client.Call.Do(new Call.CallCommand { to = new[] { new Call.Endpoint { type = "phone", number = "886989306026" } }, answer_url = new[] { "https://nexmo-community.github.io/ncco-examples/first_call_talk.json" } });

[smithrobs]

• You definitely want ApplicationKey to be the content of your private.key and not a filesystem path to it.
• I don't see a from in your Client.Call.Do example; did you accidentally omit that?

[lidondon]

ok, here's the full code below

public void MakeCall() { Client = new Client(creds: new Nexmo.Api.Request.Credentials { ApiKey = "[api key]", ApiSecret = "[secret]", ApplicationId = "703b9c80-c49f-48e6-bf3d-34b1e99bbc6e", ApplicationKey = @"-----BEGIN PRIVATE KEY----- [private.key] -----END PRIVATE KEY----- " });

        var results = Client.Call.Do(new Call.CallCommand
        {
            to = new[]
            {
                new Call.Endpoint {
                    type = "phone",
                    number = "886989306026"
                }
            },
            answer_url = new[]
            {
                "https://nexmo-community.github.io/ncco-examples/first_call_talk.json"
            }
        });
    }

}

do i need to do anything about JWT?? but i didn't see this mentioned in the online guide

[smithrobs]

JWT is handled for you when needed.

from is not optional. Per the readme:

client.Call.Do(new Call.CallCommand
{
    to = new[]
    {
        new Call.Endpoint {
            type = "phone",
            number = TO_NUMBER
        }
    },
// *** this is required!
    from = new Call.Endpoint
    {
        type = "phone",
        number = NEXMO_NUMBER
    },
// *** this is required! ^^^
    answer_url = new[]
    {
        "https://nexmo-community.github.io/ncco-examples/first_call_talk.json"
    }
});```

[lidondon]

but, i saw that if for outbound call, 'from' is optional? coz i did'n rent a number from nexmo. and i've tried that intended to delete from on playground, it worked. so, if i did not rent a number yet, what should i do with this nexmo ccharp client? thanks a lot

[smithrobs]

I'm not sure where you saw that (note that the Playground may have different and/or less strict requirements from using the API itself), but check out the official docs at https://developer.nexmo.com/voice/voice-api/building-blocks/make-an-outbound-call/dotnet and Step 2 of the prerequisites

[lidondon]

got it, thank you very much.....but i can't purchase a number (country: Taiwan), could you tell me how can i do?

[lidondon]

thank for your supporting first. now i finally place the first outbound call, that's a text- to-speech. in our scenario is that we want our customer supports can call our client on our website with nexmo voice api, but i don't know....um....i mean i don't know what NCCO should be like? or is it a outbound or inbound call? could you plz give me some guides? thanks a lot

[lidondon]

hi, now i can make a outbound call and i can get the event (app's event url). thank you again. but i still have some problems needs to fix. first, i'm confused that the call flow depends on new Call.CallCommand().answer_url (the ncco i create)? or the property in new Call.CallCommand() { to = new[] { new Call.Endpoint { type = "phone", number = "886905990870" <== my phone } }, from = new Call.Endpoint { type = "phone", number = "12013801211" <== i rent from nexmo } . . }); the second, i tried to change "from" from nexmo_number to my another phone, but fail.. the third, i pick up the call (call from my nexmo_number) then no voice, but the time is going how can i pick up the phone (nexmo_number)?? thanks

[lidondon]

hello? It's been two days..... please give me a direction, thanks

[judy2k]

Hi @lidondon,

You may be better off contacting support@nexmo.com for these issues - you're having trouble using the Nexmo service more than raising issues against this dotnet client library. I'll attempt to answer your questions as best I can though.

1: The call flow depends on the NCCO data you provide at the URL you set as answer_url. 2: You can only make outgoing calls from a Nexmo number or to a Nexmo number. You can't use the Nexmo APIs to manage calls between two non-Nexmo numbers. 3: I'm guessing that you're setting an incorrect NCCO URL, or that the NCCO data is incorrect. You should check your development server log to see if any requests are being received.

[lidondon]

Hi, judy2k thanks for your kindness supporting, actually everything works fine now