D-link DVG-7111s: setting up forwarding to D-link DVG-2102s - how?

Question

Telephony

Good day. There is the following alignment:
in office No. 1 a telephone city line was installed, an Internet from Rostelecom and there is a dvg-7111s gateway .
in office number 2 , an Internet from Rostelecom was held and there is a dvg-2102s gateway .
it is necessary that when calling to the first office, the dvg-7111s gateway transfers it to the dvg-2102s gateway to the second office, i.e. I simply forwarded the call, since the first office is not working, the room is clean, but there is a telephone line there. And in the second office, just the same, the work is in full swing, but there is no telephone line, and it is a little laborious and costly to carry it out, for this the above-described pieces of iron from d-link were purchased.
PS: I configured dvg-7111swith a simple Panasonic radiotelephone, if you call it, the gateway, as I understand it, converts the signal from the fxo port (where the city line is plugged in) to the fxs port (where the phone is plugged in) and you can talk.
also, you can make outgoing calls (when dialing a prefix, it goes to the city telephone line - everything is ok) - BUT - I can’t figure out how to make forwarding. Help...

Answer 1

I in the first office would make automatic telephone exchange on the same Aster, and users from the second stupidly konnetkil to automatic telephone exchange, but it is me.

Answer 2

We have a slightly different D-Link, I don’t know how it will be in your firmware.
Office 2 has assigned port numbers in the SIP tab.
In office 1, in the Telephony Settings tab, automatic redial is enabled when a call arrives (delay is set to 0 seconds) to numbers in the assigned ports of office 2.