Can't set up ivr in asterisk, incoming from multiphone?

Question

Asterisk

dtmf does not pass through the multiphone. The multiphone is connected and works fine - the call goes both to the phone and to the extension of the asterisk.
I'm trying to make an asterisk ivr for an incoming call through a multiphone.
You called the company, press 1 to the accounting department, press 2 to the marketing department, and so on.
I set inband and rfs 2833 in the settings - it does not work.
I call the megaphone number from the mob. phone.
In principle, does it work in Multiphone?
Let me know if anyone has faced this issue.

Answer 1

in general sip.conf
relaxdtmf=yes
in multiphone
peer dtmfmode=inband
disallow=all
allow=alaw

Answer 2

The multiphone has only inband.

Answer 3

Many thanks to you Vladimir! The second day I try to set up the IVR menu, everything is in vain. Today it still worked!!! From the bottom of my heart, guru!