Is there an Android app for using DISA PBX?

Question

Android

Task: It is convenient to make calls from a mobile phone through a PABX using the DISA
function . )yyy-yy-yy - PABX number zzz - extension for DISA menu +7(xxx)xxx-xx-xx - number of the called subscriber from the phone's address book. Ideally, you should have "call" and "call via PBX" buttons in the dialere opposite the contacts. The task is pop, from everything I found - these are some somersaults for additional dialing of country / operator codes that do not meet the listed requirements.

Answer 1

I have implemented FMTN/FMC in my office. It
is available by dialing *7000
in the phone book; I save numbers like this *7000,8961*******
This is the most acceptable option.

Answer 2

So far I have found the following option:
Install the SIP client https://play.google.com/store/apps/details?id=com....
There you can configure filters, including for regular (non-sip) calls:
Settings>Filters>Mobile>Add new filter:

"переписать"
"свое регулярное выражение"
[+]7
"Заменить на"
+7хххххххххх,777,8

Where +7ххххххххх is the number of the PBX on which DISA
777 is configured - extension number for DISA.
Authorization is configured without a password, it is simply checked by callerid the list of numbers from which this function is available.
Disadvantages of this method - Works ALWAYS for all numbers while the application is running. To call without a filter, the application must be turned off. And I would like to have call options in the dialer context menu: through DISA and directly

Answer 3

prefixer, available on google play, I call it myself

Answer 4

prefixer. support. It turned out that the free version was enough for me to call internal numbers of the organization. the filter is [2-5].*
add prefix - 89xxXXXxxXX,,
The result is this. From any dialer I immediately dial an internal number starting with 2,3,4 or 5. The prefixer intercepts the call, calls the gateway, DTMF sends the previously dialed number to the channel. Asterisk checks the CallerID against the database. If the number is yours - disa without a greeting, if someone calls the gateway number and hangups him.
If someone gave an invite, he would unsubscribe in the sandbox with a detailed article.
PS There is also a hardware option for regular phones (not smart phones). Worker.