When configuring DTMF signaling, the type of transmission to be used for the DTMF tones must be set:

LANconfig: VoIP Call Manager / Extended
WEBconfig: LCOS menu tree / Setup / Voice Call Manager / General
| Transfer of DTMF tones | |
When configuring DTMF signaling, the type of transmission to be used for the DTMF tones must be set:

LANconfig: VoIP Call Manager / Extended
WEBconfig: LCOS menu tree / Setup / Voice Call Manager / General