VoIP Phones - Gigaset N300: Difference between revisions

Settings - Telephony - Advanced Settings - RFC2833
 
Check that the Number Plan/Assignment is set to use the VoIP rather than the fixed (pstn) line.:
Settings - Number Assignment Set the VoIP for outgoing, and set the others to suit...
 
It may not say the above and Automatic negotiation of DTMF transmission will need to be Yes