The processor manages the various media types under the control of the controller.
Examples of media controlled by the MRF are as follows:
?– Tone generation
?– Conferencing
?– Text-to-speech
?– Tone detection
?– Automated speech recognition (ASR)
?– Facsimile
?– Connection control
?– Announcements
Figure 1.8 Interfacing networks with the BGCF
P-CSCF I-CSCF S-CSCF
HSS AS SLF
MGCF BGCF
22 Chapter 1
The MRFC controls media streams in the processor by interpreting requests sent by
an application server or an S-CSCF. The media themselves may be mixed within the
MRFP, for example as in a conference call. The MRFP also controls flooring in a conference
session. The AS provides start/end times for the conference, participant addresses,
and possibly host data to be shared during the conference session.
A Webinar is a good example. Different media are used during a Webinar. Voice, data,
video, and control are all incorporated into the same session. The AS provides the addresses
of all the participants and will even host the Webinar application. The MRF
controls the various media as just defined.
If providing tones, announcements, or conference capabilities, the S-CSCF or the AS
sends an INVITE to the MRF, which then responds and delivers the tone as requested.
The SDP identifies the bearer path where the tone is being delivered.
Pages:
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77