To configure A190 in M300 environment its needed to change a setting from the config file and reboot, an later apply the modified configuration file


We recommend to use 450B13 firmware version


https://service.snom.com/display/wiki/BSV450B13+%28base%29+HSV450B13+%28handset%29+-+Official+Release


Step 1


Export configuration



Step 2 


Modify value of allow_call_groups to off as show below


Step 3


Reset Base to factory defaults



Step 4 


Import configuration exported and modified


Select File from Configuration tab, and later press on Load


Step 5


Configure as show in manuals


https://service.snom.com/display/wiki/How+do+I+pair+the+A190+headset+with+an+M+series+DECT+handset



You should register A190 and M25 with differents account, after that , you can pair M25 to A190 to have one extension for both in the IPEI Tab -> Pair Option as shown, pressing over the IPEI number of M25 extension selecting as paired terminal Terminal Idx where x is the A190 Id



For any doubt please contact us in helpdes