2N Helios IP Configuration Manual page 84

Sending mode – define whether it will be possible to send DTMF during a call by
pressing 0 through 9, * and # on the intercom numeric keypad. Set the sending
mode for incoming/outgoing/all calls.
In-Band (Audio) – enable classic DTMF dual tone sending in the audio band.
RTP (RFC-2833) – enable DTMF sending via the RTP according to RFC-2833.
SIP INFO (RFC-2976) – enable DTMF sending via SIP INFO messages
according to RFC-2976.
The tab below helps you define how DTMF characters shall be received from the
intercom. Check the DTMF receiving options and settings of the opponent to make the
function work properly.
In-Band (Audio) – enable classic DTMF dual tone receiving in the audio band.
RTP (RFC-2833) – enable DTMF receiving via the RTP according to RFC-2833.
SIP INFO (RFC-2976) – enable DTMF receiving via SIP INFO messages
according to RFC-2976.
QoS DSCP value – set the audio RTP packet priority in the network. The set
value is sent in the TOS (Type of Service) field in the IP packet header. Value is
entered in decimal format. The parameter is not applied until the intercom is
restarted.
Jitter compensation – set the buffer capacity for jitter compensation in audio
packet transmissions. A higher capacity improves the transmission resistance at
the cost of a greater sound delay.
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