How to set up a Polycon Soundstation2 conference call in conference mode with a Panasonic KX-TDA100 PBX?

Question

Telephony

In phone mode, the conference call works. But when you need to create a conference call - FIG.
1) The second call is not transferred from the secretary's phone to KK. Line is busy. We try to transfer to the same internal number of the CC, to which the first call has already been transferred. Let's say 777. It seems to me that this is somewhat incorrect. Probably, it is necessary to somehow configure the 2nd internal number to the same CC. Question - how?
2) If numbers are dialed from the CC itself, first to 1 phone, then to 2. Then the subscribers do not hear each other. The conference mode is activated according to the instructions www.polycom.su/pdf/audio_docs/Soundstation2_with_d... page 14
I have a question. And in the case of an analog line, is a conference call possible at all?

Answer 1

Polikom to Panasonic connected analog? If so, the conference should be created in Panasonic - for this it is desirable to have echo suppression boards in it.
Picture from the manual :
Instead of "Press the lever" you need to press the FLASH button on the Polycom .

Answer 2

And how to transfer 2 subscribers to KK from the secretary's phone?
Do I need to set extension number 2 to KK or something else?