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
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