Multi-Tech MultiModem EDGE Reference Manual page 94

Notes:
•
Teleservices other than voice and data are not fully supported by ME. They are used only in connection with
the handling for AT+CSNS, and may therefore occur in parameter <mode> for mobile terminated calls.
•
If a URC "^SLCC" in verbose mode (see AT^SCFG) has been buffered while the interface was in dedicated
mode (depending on the settings of AT+CMER parameter <bfr>), each buffered event indicator will be output
as a separate URC after the interface returns to idle mode.
However, the output will deliver the list of current calls in the "current" state (at the time when the output is
generated), possibly leading to multiple displays of identical list configurations.
• Some parameters of AT command AT+CHLD, as well as some situations where the call status in the network
changes very quickly (e.g., the transition between <stat>= "unknown", "dialing" and "alerting" for a call to a
reachable subscriber within the registered network) may lead to quasi-simultaneous changes to the states of
one or several calls in the list, possibly leading to multiple displays of identical list configurations.
•
If multiple displays of identical list configurations occur, this happens because of intermediate states of the list,
that have already been overridden by new transitions and states. Thus, it is guaranteed that the configuration
displayed in such cases is the current configuration at the time of the last display.
•
It is advisable to receive URC "^SLCC" on an interface that is not used for call initiation, if verbose output is
configured.
Examples
Example 1
^SYSSTART
at+cpin=9999
OK
+CREG: 2
+CREG: 1,"0145","0016"
OK
atd"1234567";
^SLCC:
1,0,2,0,0,0,"1234567",129,"Called Party"
^SLCC:
^SLCC:
1,0,2,0,0,1,"1234567",129,"Called Party"
^SLCC:
^SLCC:
1,0,3,0,0,1,"1234567",129,"Called Party"
^SLCC:
^SLCC:
1,0,0,0,0,1,"1234567",129,"Called Party"
^SLCC:
atd23456;
OK
^SLCC:
1,0,1,0,0,0,"1234567",129,"Called Party"
^SLCC: 2,0,2,0,0,1,"23456",129
^SLCC:
^SLCC:
^SLCC: 2,0,2,0,0,1,"23456",129
^SLCC:
^SLCC:
1,0,1,0,0,0,"1234567",129,"Called Party"
^SLCC: 2,0,3,0,0,1,"23456",129
^SLCC:
^SLCC:
1,0,0,0,0,1,"1234567",129,"Called Party"
^SLCC:
NO CARRIER
^SLCC:
NO CARRIER
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371G)
We are now registered
We start a voice call.
MO call starts, paging B-party
End of current list
Traffic channel established,
network may now transmit network announcements,
ME may now transmit DTMF tones.
End of current list
Call is now ringing at B-Party
End of current list
B-Party has accepted the call, connection established
End of current list
We start a second voice call.
"OK" response issued immediately because another call is already active (ATD)
The active call is automatically put on hold, triggering the display of the list
The second call has already started before the indication for the held call could
be displayed
End of current list
Identical list is displayed again, triggered by the start of the second voice call
Status of the second list entry has already been displayed with the previous URC
End of current list
The held call doesn't change status right now
The second call is now alerting the B-Party
End of current list
The held call doesn't change status right now
End of current list: the B-Party of the second call has not accepted the call in
time, the second call has ended.
The second call has ended
list is now empty: B-Party has ended the first call
The first call has ended
Chapter 7 – Call-Related Commands
94