GPRS RS232 modem over USB-Serial adapter timeout in ppp session

Hi, I’m trying to configure ppp-client with GPRS modem Maestro 100 EVO (https://adaptivemodules.co.uk/index.cfm/fa/shopdetails/Product_ID/748) over USB-RS232 Profilic adapter on Mikrotik RB951Ui-2HnD.

Modem answer on AT-commands by serial terminal “/system serial-terminal usb1 channel=0”.

ati

Sierra Wireless
WMP100 Product

My ppp-client settings is:
name=“ppp-out1” max-mtu=1500 max-mru=1500 mrru=disabled port=usb1 data-channel=0 info-channel=0 apn=“static.sib” pin=“” user=“mts” password=“mts” profile=default phone=“” dial-command=“ATDT” modem-init=“” null-modem=no dial-on-demand=no add-default-route=yes default-route-distance=1 use-peer-dns=yes keepalive-timeout=30 allow=pap,chap,mschap1,mschap2

After connecting ppp-client I’m trying Tools-Ping:

Ping to: 8.8.8.8
Interface: ppp-out1
Timeout:1000, than trying 5000, than 10000

and have timeout, timeout.

How to configure RS232 GPRS modem over USB-Serial adapter for correct working with ppp-client on Mikrotik?