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ATA Voice Field Reference
PSTN Line page (SPA3102)
ATA Administration Guide 209
B
Disconnect Tone This value is the tone script which describes to the SPA the
tone to detect as a disconnect tone. The syntax follows a
standard Tone Script with some restrictions. Default value
is standard US reorder (fast busy) tone, for 4 seconds.
Restrictions:
• 2 frequency components must be given. If single frequency
is desired, the same frequency is used for both
• The tone level value is not used. –30 (dBm) should be used
for now.
• Only 1 segment set is allowed
• Total duration of the segment set is interpreted as the
minimum duration of the tone to trigger detection
• 6 segments of on/off time (seconds) can be specified. A 10%
margin is used to validated cadence characteristics of the
tone.
The Disconnect Tone Script and Impedance value for
various countries follow:
US—480@-30,620@-30;4(.25/.25/1+2) —Impedance: 600
UK—400@-30,400@-30; 2(3/0/1+2) —Impedance:
370+620
France—440@-30,440@-30; 2(0.5/0.5/1+2) —Impedance:
270+750||150nF
Germany—425@-10; 10(0.48/0.48/1) —
Impedance:220+820||120nF
Netherlands—425@-30,425@-30; 2(0.5/0.5/1+2) —
Impedance: 600
Sweden—425@-10; 10(0.25/0.25/1) —Impedance:600
Norway—425@-10; 10(0.5/0.5/1) —Impedance: 600
Italy—425@-30,425@-30; 2(0.2/0.2/1+2)— Impedance:
220+820||120nF