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RIP Audio Packet Format
We do not cover Internet Protocols, please refer to other documents for that. We will
cover the data as it pertains to the RIP Audio. The RIP audio is encapsulated in a UDP
packet with the source and destination port numbers set to the UDP Command Port+2.
The UDP Packet contains an RTP (Real Time Protocol) format packet that contains the
audio. RTP is the format utilized by various commercial Voice Over IP programs
already. The Header may include most recently measured Signal Strength if in receive
mode, or it may include the most recent Transmit power levels. The format of the data is
the same as what is returned in the S Unit and Power Level Queries. The first octet of the
Header Information will indicate if this information is present or if it is standard RTP
format. The format of the data packet used for OMNI-VII RIP is as follows for non-
compressed audio:
Octet 0
OR
Octet 0
Octet 1
Octet 2-3
Octet 4-7
If Header Information Octet 0 = 0x80 then Octets 8 through 11 are RTP as follows:
Octet 8-11
Otherwise Octets 8 through 11 contain the Signal Strength or Power Levels
"ABCD" of the SUNIT query defined previously in this specification.
Octet 12-139
2 Octets => 1 16bit audio
For compressed audio, the packet is of the same length, only difference is that each
byte contains a complete 8 bit audio. 1 Octet => 1 8bit audio. Meaning this is a total of
128 audio bytes. The packets will come out at ½ the rate of the non-compressed audio,
yielding a lower bandwidth requirement
Rev 1.009
OMNI-VII Firmware Updates at www.rfsquared.com
Header Information
Version -> 2
Padding -> 0
Extension -> 0
Header Information
Header Information Continued
Marker -> 0
Payload Type 80d
RTP Sequence
Packet Counter (=last+1)
RTP TimeStamp
Time Counter (=last+64)
RTP Sync Source
ID of the Radio (last 4 MAC digits)
Audio Data
Total of 64 audio words
OMNI-VII Programmer's Reference Guide
0x80 = RTP Format
0x00 = Includes Signal
Strength or Transmit Power
Level
0x50
0xnn 0xnn
0xnn 0xnn 0xnn 0xnn
0x45 0xmm 0xnn 0xoo
0xnn...
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