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part 2 - Coggle Diagram
part 2
voice transmission
voice digitalization
A-D:
Band filtering
to 0,3-3,4 kHz
Sampling
2*bandwidth
quantization
linear
uniform levels
non-linear
denser at low amplitudes
encoding
codec
wavecoder
hybrid
vocoder
AMR-WB(HD voice) higher bitrate, but better quality
D-A
inverse quantizatiobn
band filtering(smoothing)
decoding
VoIP
IMS - architecture for implementing the IP backbone for the mobile and wired multimedia networks
CSCF - call session control function
voice encoding and decoding
transmission of voice packets
over RTP in UDP
signaling
SIP - session initiation protocol
User agent
proxy server - routes the call
registrar - registers the UA's location and sipURI
redirect server
location server
gateway
SIP request types
numbering