The phone number is not detected in FXO on the grandstream UCM gateway, which caller id scheme should I choose?

Question

Telephony

Telephone operators, save, phone numbers that arrive at the analog copper port of the grandstream ucm 6204 gateway are not detected.
What is:
1. ONT hg8245q
2. grandsteam
ucm6204 Those. a sip account has been set up on the ONT, which is tied to the FXS port of the ONT, then ordinary copper to the FXO port of the UCM, and an analog trunk to the UCM.
The connection scheme causes a smile, but it’s necessary, the provider refuses to give the sip trunk in the normal way, nailed it to the ONT with nails and went unconscious.
Because one line is enough, then in principle the solution suits, calls arrive and depart, there are no problems with sound, even though it is converted from digital to analog, then back to digital.
And everything would be fine, but the phone numbers of incoming calls are not determined from the word at all.
I am not a real telephonist welder , I poorly understand the mechanism of the caller ID, but something tells me that I need to select the correct caller id scheme in the analog trunk settings. And the choice there is quite large, all this is configured remotely and choosing the right one is not an option.
I tested autodetect and ETSI-DTMF and in the CDR logs I see Undetected 0000 [Trunk: LandLine] or Anonymous [Trunk: LandLine] and this makes me a little sad.
Actually questions:
1. Should the determinant work with such a crutch connection scheme?
2. Maybe you need to press which button in the ONT? While there is no access there and it is not clear whether it is worth climbing there.
3. Why smoke on this topic for complete enlightenment?

Answer 1

If you connect a phone instead of ucm, the number on it is determined?