Which software IP PBX to choose?

Question

Telephony

Good afternoon! There is a small IT office, there was a need for ATSk (software).
The choice somehow fell on Oranguce, but the developer company closed and we flew over with the purchase, the PBX itself was based on friswitch, there was a very convenient admin panel interface, and good functionality. Of the resources, only wiki.orangeuce.com
remained. Actually, we need an analogue with a permanent license, and not a subscription fee.
Functionality:
1) This is definitely the ease of settings. There will be no dedicated specialist, but we already have enough work.
2) I really want the feature that was in orange.
There it was possible to bind to the internal number not only the phone / softphone, but also the mobile phone, and for example, when my softphone was offline or the status was "out of office", the calls went to the mobile phone.
3) It would also be nice to have the opportunity to integrate into third-party applications (1C for example)

Answer 1

asterisk+freepbx?
sipXecs

Answer 2

If you are interested in full functionality or API, then there is a cloud PBX VirtualOfficeTools . This is such a monster that is suitable for small businesses and for the same telecom operators. The only downside is the not-so-nice design. Fortunately, you only need to set it up once :)

Answer 3

hmm, I smoked the sipXecs site, most likely it will suit us)

Answer 4

Elastix?