Setting up a voice greeting in SIP telephony[SOLVED]?

Question

Asterisk

Good afternoon. I am not a professional in the field of SIP telephony, but I need to solve the following problem. You need to set up a voice greeting when calling a specific number, and when you enter an extension code, play the next voice greeting.
I solved the problem with the help of FreePBX Asterisk, namely setting up IVR when calling a specific number. Everything works as described above. The question is whether it is possible to implement this task, but without registering the phone with the number to be called.
That is, ideally, there is one phone from which you can call different numbers and listen to different voice tracks. If this is not possible, then if there are any other options to solve this problem.

Answer 1

Yes, it's possible. The presence of a certain number does not require the presence of a registered physical device. Anything can be hidden behind the dialed number, including IVR.