Help redirecting calls

Hi, I’m new to the community and using FreePBX, if anyone can help I would greatly appreciate it.

I have a desktop running FreePBX 16 with IP address 192.168.0.3. I created extensions 7000, 7001, 7002 and 7003. I have an Interphone device at reception. This Interphone is connected to an ATA device on the local network under IP 192.168.0.244. I activated extensions 7000 and 7001 on this ATA.

My question is how to correctly configure the ATA device to transfer calls from INTERPHONE to extensions 7002 and 7003. That is, I want that when someone rings INTERPHONE at the concierge, extensions 7002 and 7003 ring and answer the calls. Thank you very much!

Does the interphone use extensions 7000 and 7001?