Why can a situation arise in a multiphone so that there are no beeps (mobile and sip mode)?

Question

Asterisk

I can not debug in any way - it arises quite suddenly - a month can work. But I don’t know how to catch silence instead of beeps from customers. In the dialplan, there is a pause for regular pipes to ring, then for voicemail, and so on.

Answer 1

без нужды не давать Answer в самом начале диалплана
обычно помогает дать последовательно
Ringing()
Wait(1)
потом уже Answer... если необходимо