If I understand you correctly, you want to reproduce a string (the remote number) within a new string, and enclose it in double quotes (what you called inverted double comma). You can do it like this:
#include <iostream>
#include <strstream>
int main()
{
auto remotenumber = "0123456";
std::strstream message;
message << "The number is \"" << remotenumber << "\"." << std::endl;
cout << message.str();
return 0;
}
The output is:
The number is "0123456".
The leading '\' is called an escape character. You can use it for lots of special stuff. In this case to prevent the compiler from interpreting the double quote as 'end of string'. A full list of escape sequences can be found here:
Escape sequences in C - Wikipedia[
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