2N Helios IP Configuration Manual page 78

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.
Video
Codec 1–4 – set the order of video codecs for call setup: H.264, H.263+ or
H.263. The order defines the codec priority, i.e. the first codec has the highest
priority.
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