Why can't I hear my interlocutor Asterisk GSM Dongle?

Question

Asterisk

There is a virtual machine (Vbox), an E150 Huawei modem is connected to it via usb. Inside the calls go normally (you can hear each other), but if you call external numbers, the interlocutor does not hear me, I hear him (exit to the outside through the dongle). What could be the reason?

Answer 1

Huawei e150 has one-way audibility when installing the standard chan_dongle module. You need to find either patch the module yourself or use other modems (Huawei e1550, e171, e173). Or use Oktell SIP GSM gateway on Windows, it supports these modems correctly.
asterisk-service.com/page/chan-dongle-modems

Answer 2

You have to debug. install sgrep and see what happens during the call.