Axis 2N Indoor View User Manual page 51

In-Band (Audio) – enable classic DTMF dual tone receiving in the audio band.
RTP (RFC-2833) – enable DTMF receiving via 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.
Jitter Compensation – set the buffer length for compensation of interval
unevenness in audio packet arrivals. A higher capacity improves the transmission
resistance at the cost of a greater sound delay.
Video
Enable/disable the use of video codecs for call setups and set their priorities.
H.264 Payload Type (1), (2) – set the video codec H.264 payload type
(packetization mode 1). Set a value from the range of 96 through 127, or 0 to
disable this codec type.
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