User's Manual
Radio Activity S.r.l. 34 / 44
5.1 SIP/RTP Gateway
KAIROS can run an optional “DMR Gateway” agent to interface Analog and DMR radio systems to several
external networks (the AMBE codec option board is requested). It allows radio users to easily communicate
and interoperate with:
∞ External telephone applications like conventional PSTN equipments (external interface needed) and
VoIP systems (SIP PABX, SIP Hardphones, Softphones, Open Source SIP platforms).
∞ Dispatching systems and control room applications like analog 4-wire + E&M consoles, RTP based
consoles, SIP based dispatching systems for control room applications, to connect a Base Station (or a
radio network) to a local operator desk.
∞ Other users under different radio networks/repeater (Wide Area Mobility).
The DMR Gateway Agent translates Voice (full duplex audio streams from/to DMR coded audio to G.711
µ
-
law or a-law) and Data streams, along with the associated signaling (for example SIP RequestsDMR or
DTMFDMR) to provide the interconnection between these communication systems.
The DMR Gateway Agent runs into the KAIROS engine without the need of an external PC. This Agent is
compatible with the DTI/DMR Gateway module of the
RA-XXX
family of DMR Base Station (blue series) and
can be used in the same system.
These Agent manages one or two DSP processors for audio encoding/decoding (vocoders). A lot of
applications may be available by using the extremely compact coded bandwidth and the powerful built-in
functionalities. The applications are targeted to the DMR radio communication Dispatching Room.
This audio can be easily managed using standard audio program and application on a PC. Radio Activity will
provide the protocol descriptions to allow his partners to develop their own applications.
See the SIP/RTP Gateway document for more details.