How to find subnet settings?

Question

Cisco

There are Cisco 7940-41 devices, in connection gap: network - phone - PC. There is no access to Asterix.
On the devices, only the IP address is visible - 192.168.50. *
The network itself on the PC is 192.168.10. *
How to understand and how to view the settings of this subnet in order to get to the phone's web interface?
Already WireShark'om tried to scrape something, nothing.

Answer 1

Nothing is configured in the web face of these devices. It is only informational. And in the config merged with TFTP, it is always disabled by default. So there is nothing to do there.

Answer 2

So for these phones it is most likely disabled or completely absent. So - sorry. They are configured through Cisco Call Manager or by uploading configs via TFTP

Answer 3

As an option, set the address 192.168.50.15/20 on the destination host, while checking that this address is free.
But there may be subtleties. Phones usually sit in a separate Vlan, which is issued to them upon negotiation thanks to cdp. Plus distribution of ip addresses happens on DHCP for phones. Might not work.

Answer 4

Let's dump wireshark here. Something tells me that the phone tags its traffic into a separate VLAN.
There is no WEB on it, but telnet can be opened (if not closed) through which you can merge the config. The default password is cisco.