Is it possible to connect another PBX to the PBX?

Question

VoIP

We have a main PBX (Panasonic KX TDA-200), where all external numbers are connected and it is our main server. There were new buildings to which it is impossible to stretch lines and therefore it was decided to purchase a VoIP server (asterisk).
Can this VoIP server be connected to a PBX?
An example of how we would like to do it: When a call from an external number gets to the PBX, the PBX redirects to some person, but it turned out that you need to transfer the call to another person who uses VoIP, for this you need to dial 0422 (0 indicates that you need redirect the call to VoIP, and the rest is already the person's number).
And if the VoIP subscriber needs to go to an external line, he enters a 0-9 number, where 0 is a connection to the PBX, and 9 is the use of an external line.

Answer 1

Стоило лишь заменить материнскую плату TDA на TDE и никаких бы костылей придумывать не пришлось. Раздавали бы VoIP с Panasonic'а.

Answer 2

Правильно: Теперь asterisk является основной АТС. Панасоник использовать как простой FXS шлюз.
Все входящие. Все голосовые меня. Всё на asterisk.
Соединять лучше по потоку E1 (правда это зависит от количества народу на Панасонике)

Answer 3

Лучше подключить облачную АТС и не важно где находятся абоненты.