Network phones settings help

Hi guys! Pease someone help me with settings of HUAWEI HG 659B modem. There is a problem with transfering internall calls (IP phones in small office). Manufacturer send some rules to be set in the router which i found and set just the first one. Settings suggested by manufacturer:

  1. Disable SIP ALG (found this option)
  2. Allow all traffic from and to IP range of 194.213.29.0/24 (Whole Subnet)
  3. UDP- Keep alive time out needs to be set to 200 seconds.

Anyone knows how to do that? Thanks!