Cisco 3521, Руководство администратора

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Administrator’s Guide for Cisco IPVC 3521 BRI Gateway, Cisco IPVC 3526 PRI Gateway, and Cisco IPVC 3540 PRI Gateway
OL-7995-01
Chapter 3 Configuring the Cisco IPVC 3500 Series Gateway
Configuring Gateway Settings
The touch tone system uses pairs of tones to represent the various keys on the telephone. A “low tone”
and a “high tone” are associated with each button (0-9, *, and #). The low tones vary according to the
horizontal row in which the tone button is located in
Table 3-9 . The high tones correspond to the vertical
column in which the tone is located. The local telephone company receives each pair of tones, decodes
the number dialed and makes the connection.
About DTMF Detection on IP-to-ISDN Calls
The gateway passes incoming in-band DTMF signals to the ISDN-side endpoint unchanged. In addition,
you can configure the gateway to convert H.245 out-of-band DTMF signals from the IP side to in-band
signals on the ISDN side.
Figure 3-2 illustrates IP-to-ISDN DTMF processing.
Figure 3-2 IP-to-ISDN DTMF Processing
Table 3-9 DTMF Tone Assignments
1209 Hz 1336 Hz 1477 Hz 1633 Hz
697 Hz 1 ABC
2
DEF
3
A
770 Hz GHI
4
JKL
5
MNO
6
B
852 Hz PRS
7
TUV
8
WXY
9
C
941 Hz * oper
0
# D
Translate DTMF from IP out-of-band (H.245) to ISDN in-band (ISDN G.711 only)
Disabled
Gateway
IP
H.245
out-of-band
ISDN
Suppressed
In-band In-band
Enabled
Gateway
IP
H.245
out-of-band
ISDN
In-band
In-band In-band
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