Xblue Networks X-50 - Manual (Page 26)

System Specifications
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In/out Band RFC 2833 In/Out Band is used to define the method of transporting DTMF tones to
use on RTP connections. In-Band are tones that are “heard” by the distant
party, and Out of Band tones are used for signaling.
MD5 RFC 3261 Message-Digest Algorithm 5 - is a widely used Cryptographic hash function
(security) that uses 128 bit hash value.
QoS RFC 2990 Quality of Service assigns different priorities to different data packets.
Voice, for example, will receive a much higher priority than non-voice
traffic, so it receives the highest priority. Therefore, QoS is used to
prioritize specific packets, such as voice, within a packet-switched network.
However, it does not guarantee voice quality.
T.38 ITU-T T.38 T.38 is the standard for transporting FAX transmissions, between G3 Fax
devices, over an IP Network.
RTP RFC 1889, 3550 Real-time Transport Protocol provides end-to-end network transport
functions suitable for applications transmitting real-time data, such as
audio, video, or simulation data, over multicast or unicast network servers.
RTP is a standardize protocol for delivering audio and video over the
Internet.
SDP RFC 2327 Session Description Protocol is purely a protocol that negotiates between
two endpoints to allow them to agree on a media type and format. It is
intended for describing multimedia sessions, and to on a wide range of
networks and networking environments.
SIP V2 RFC 3261 Session Initiated Protocol is an applications layer control (signaling)
protocol that is outlined in the “Internet Official Protocol Standards”
document number RFC 3261.
ToS RFC 791, 1060, 1122, 1123,
1195, 1247, 1248, 1349,
2474, 3168 The Type of Service octet is part of the Internet Protocol header that
specifies the priority of the attached datagram (message).
DTMF RFC 4733 Dual Tone Multi-Frequency Tones - also known as touch tones ® - Defined
protocol for transmission of DTMF tones transmitted over a packet
switching network.
AF Class RFC 2597 One part of QoS, is Assured Forwarding Classes. This allows the
administrator to divide the IP Packets into one of 12 different Classes. In
the event that the network becomes congested, the packets with the
highest Drop rate will be dropped.
EC RFC 3246 Expedited Forwarding has the characteristics of low delay, low loss, and
low jitter, making it suitable for Voice, Video and other real-time services.
TABLE 2.8 VoIP & Signalling Protocols
Signaling Documented Protocol Description