How to make monitoring of zabbix analog phones?

Question

linux

There are several phones attached to the voip gateway. Monitoring is configured for registering SIP accounts on the asterisk server. It's simple enough.
And monitoring is considered complete for ip-phones and for soft-backgrounds.
Analog phones are connected to the gateway, on which, roughly speaking, the ports are always registered in asterisk ...
Interested in: how can I set up monitoring of analog phones?

Answer 1

I settled on the fact that full-fledged monitoring of analog phones, at least on existing equipment, did not work out

Answer 2

If the gateway can send statistics via SNMP, then receive information via SNMP.

Answer 3

Well, if there is a watchman there, you can call these phones and ask them to dial the numbers in the tone: 15-16-23-42
Well, or read the documentation for the gateway, maybe there is a test line.