Microsoft UCMA 4.0 API QuickStart App for skype - visual-studio

Question

i'm using Microsoft UCMA 4.0 API QuickStart App AudioVideo Recorder for Skype for Business. When i call user from inside organization, i can contact and record voice.
We have federation with external skype users. When i try to call external sip name.surname(gmail.com)#msn.com i'm getting exeption:
An exception of type 'Microsoft.Rtc.Signaling.RegisterException' occurred in Microsoft.Rtc.Collaboration.dll but was not handled in user code
Additional information: The endpoint was unable to register. See the ErrorCode for specific reason.
Here is the procedure:
private void EndEndpointEstablish(IAsyncResult ar)
{
LocalEndpoint currentEndpoint = ar.AsyncState as LocalEndpoint;
try
{
currentEndpoint.EndEstablish(ar);
}
catch (AuthenticationException authEx)
{
// AuthenticationException will be thrown when the credentials are invalid.
Console.WriteLine(authEx.Message);
throw;
}
catch (ConnectionFailureException connFailEx)
{
// ConnectionFailureException will be thrown when the endpoint cannot connect to the server, or the credentials are invalid.
Console.WriteLine(connFailEx.Message);
throw;
}
catch (InvalidOperationException iOpEx)
{
// InvalidOperationException will be thrown when the endpoint is not in a valid state to connect. To connect, the platform must be started and the Endpoint Idle.
Console.WriteLine(iOpEx.Message);
throw;
}
finally
{
// Again, just for sync. reasons.
_endpointInitCompletedEvent.Set();
}
}
How can we reach external users?
After few hours tried second time to call inside user and it is not working. Now getting message:
An exception of type 'Microsoft.Rtc.Signaling.AuthenticationException' occurred in RecorderSample.exe but was not handled in user code
Additional information: Not authorized to perform the requested operation, request is refused
Why i'm not authorized suddenly?

Answer 1

I think you are getting confused.
UCMA applications create and service sip endpoints. A sip endpoint is like a "phone" in that it can make and receive audio / video calls, IMs, etc.
There are two types of endpoints a UCMA application can create:
UserEndpoint
ApplicationEndpoint
Both types of endpoints are pre-defined types of users in Lync.
Sip endpoints need to register with the sip registrar (Lync Front End) which is like pluging a phone into the wall. It's says I'm here, if you get any calls for 'X' send them my way.
So you have done is try to "Register" a sip endpoint that is "name.surname(gmail.com)#msn.com" with your local Lync Front End. This is illegal, which is why you are getting the "Microsoft.Rtc.Signaling.RegisterException" errors.
What you may want to do is register a "local" Lync user and then "dial" the federated account OR get the federated account to dial you.