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Grandstream SIP phone

Model: GRP2612W

ssh -o HostKeyAlgorithms=+ssh-rsa -o PubkeyAcceptedAlgorithms=+ssh-rsa -o StrictHostKeyChecking=no -l admin [IP]

Config 

CONFIG> help
Supported commands:
    set name value   -- Set a variable
    set ip dhcp      -- Set WAN DHCP mode
    set ip address   -- Set WAN IP address
    set netmask mask -- Set WAN network mask
    set gw address   -- Set WAN default gateway
    set mac address  -- Set WAN MAC address
    get name         -- Get a variable
    get ip           -- Get WAN IP setting
    get netmask      -- Get WAN network mask setting
    get gw           -- Get WAN default gateway setting
    unset name       -- Unset a variable
    commit           -- Commit the changes to FLASH
    cfg_update       -- Apply cfg update
    otp_list         -- Show list of OTP (One Time Programmable) settings
    help             -- Show this help text
    exit             -- Exit this command shell

Variables 

207 : syslog server, 514 UDP by default # need commit, reboot 
208 : syslog level # 0 - NONE, 1 - DEBUG, 2 - INFO, 3 - WARNING, 4 - ERROR
290 : Dial Plan

1387: SIP log

# ACCOUNT 1
47 : sip server
Apply 
cfg_update

More info about variables: https://support.ispsupplies.com/portal/en/kb/articles/grandstream-p-codes-31-10-2019