SIP Gateway (gateway) for android: which application?

Question

Android

The google store is full of SIP client solutions for android.
The situation on the contrary is necessary to me that the OPSOS line to connect to the gateway on Asterisk is necessary. Scheme:
operator network -> android phone (sim card) -> SIP gateway software -> WiFi -> Asterisk
In the FXS and FXO gateway, a connection to the Asterisk server is usually configured, registration is made on the server and we can receive channels of this gateway from Asterisk. The scheme needs the same
Question - does anyone know the application I need? How can it be configured?

Answer 1

Acer phone, did not find the manual. Like rutanul, like set. Does not work.

Answer 2

The only thing I've seen habrahabr.ru/post/239419