© 2003 - 2005 Sipura Technology, Inc
Proprietary (See Copyright Notice on Page 2)
130
•
Long timeout (L) = one or more digits pressed, more digits needed to reach a valid number
(as per the dial plan).
•
Short timeout (S) = current dialed number is valid, but more digits would also lead to a valid
number.
7.2.20. Message Waiting Indicator Tones – MWI
7.2.21. Polarity
Control
The SPA allows the polarity to be set when a call is connected and when a call is disconnected. This
feature is required to support some pay phone system and answering machines.
7.2.22. Calling Party Control – CPC
CPC signals to the called party equipment that the calling party has hung up during a connected call
by removing the voltage between the tip and ring momentarily. This feature is useful for auto-answer
equipment which then knows when to disengage.
7.2.23. International Caller ID Delivery
In addition to support of the Bellcore (FSK) and Swedish/Danish (DTMF) methods of Caller ID (CID)
delivery, release 2.0 adds a large subset of ETSI compliant methods to support international CID
equipment. The figure below shows the CID/CIDCW architecture used in the SPA. Different flavors of
CID delivery method can be obtained by mixing-and-matching some of the steps as shown.
It should be noted that the choice of CID method will affect the following features:
• On Hook Caller ID Associated with Ringing – This type of Caller ID is used for incoming calls when
the attached phone is on hook (see Figure 1 (a) – (c). All SPA CID methods can be applied for this
type of caller-id
• On Hook Caller ID Not Associated with Ringing – In the SPA-2000 this feature is used for send
VMWI signal to the phone to turn the message waiting light on and off (see Figure 1 (d) and (e)). This
is available only for FSK-based caller-id methods: “Bellcore”, “ETSI FSK”, and “ETSI FSK With PR”
• Off Hook Caller ID – This is used to delivery caller-id on incoming calls when the attached phone is
off hook (see Figure 1 (f)). This can be call waiting caller ID (CIDCW) or to notify the user that the far
end party identity has changed or updated (such as due to a call transfer). This is only available if the
caller-id method is one of “Bellcore”, “ETSI FSK”, or “ETSI FSK With PR”.
Polarity
Reversal
First
Ring
CAS
(DTAS)
DTMF/
FSK
Polarity
Reversal
CAS
(DTAS)
FSK
CAS
(DTAS)
Wait For
ACK
FSK
First
Ring
FSK
OSI
FSK
a) Bellcore/ETSI Onhook Post-Ring FSK
d) Bellcore Onhook FSK w/o Ring
f) Bellcore/ETSI Offhook FSK
c) ETSI Onhook Pre-Ring FSK/DTMF
e) ETSI Onhook FSK w/o Ring
DTMF
b) ETSI Onhook Post-Ring DTMF
First
Ring
