How can I get a ACS ID for initiating a 1:1 voice all using Azure Communication Service?

I am using the sample code from Azure to trying the JS SDK of the Azure Communication Service. Now I am trying to initiate an outgoing call. But the API needs the ACS ID for the outgoing call and I am unable to find this ID.

I have already created a resource in azure portal and got the Connection String. A user token with VOIP is also generated. The SDK initialisation has worked with the connection string. But I could only initiate a voice call to the azure echo bot using 8:echo123 successfully.