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Monitoring
Table 5: Call States
Serial
Number
U25 /
N25
User Side Call
Status
Network Side Call
Status
This state exists
when a number is
being called in, at
the same time the
user has confirmed
the call setup
request, and prepare
to receive the call
information with
overlap mode(if
any).
This state exists when
a number is being
called in, at the same
time the user has
received the
confirmation
information of call
set-up request, which
denotes that the
network is allowed to
send forth call
information to the
user with overlap
mode.
State
Overlap
Reception
CPN
This is the calling party number.
CDPN
This is the called party number.
Timestamp
The timestamp value reports the setup time (which is always 0)
and the connection time. As shown on the screen, the format is
setup time / connection time. Timestamp values are measured in
seconds.
CallID
The CallID is a number that is used to identify a call when SIP is
switching information. The length and value of the CallID are randomly
generated.