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© 2004 Linksys Proprietary (See Copyright Notice on Page 2)
a) Bellcore/ETSI Onhook Post-Ring FSK
First
Ring
b) ETSI Onhook Post-Ring DTMF
First
Ring
c) ETSI Onhook Pre-Ring FSK/DTMF
Polarity
CAS
Reversal
(DTAS)
d) Bellcore Onhook FSK w/o Ring
OSI
e) ETSI Onhook FSK w/o Ring
Polarity
CAS
Reversal
(DTAS)
f) Bellcore/ETSI Offhook FSK
CAS
(DTAS)
Figure: PHONE ADAPTER Caller ID Delivery Architecture
FSK
DTMF
DTMF/
First
FSK
Ring
FSK
FSK
Wait For
FSK
ACK
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