NAL Research Corporation (451-93156-002A)
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On a DTE-DCE command, <n> will set the result code presentation status in the A3LA-RM,
regardless of the value of any <mode> parameter.
<mode> (when <mode> parameter is not given, network is not interrogated):
0
disable Call Waiting service for specified class(es)
1
enable Call Waiting service for specified class(es)
2
query status of Call Waiting service for specified class(es)
<classx> is a sum of integers each representing a class of information:
1
voice
2
data
4
fax
This parameter defaults to 7, equal to all classes, but the A3LA-R/RM/RGS only supports
Voice Call Waiting so this is illegal. Therefore in practice the DTE must supply <classx>=1.
<status>:
0
Call Waiting service not active for specified Class
1
Call Waiting service active for specified Class
<number>: quoted string type phone number of calling address in format specified by <type>
<type>:
type of address octet in integer format (refer GSM 04.08 [7] subclause
10.5.4.7);default 145 when dialing string is international number, otherwise 129.
If the network rejects a request to activate/deactivate the Call Waiting service due to it not
being provisioned (or for other reasons), the reported CME ERROR code will be 133 “requested
service option not subscribed”. This is strictly speaking a GPRS-related code (GSM 07.07 [2]
subclause 9.2.2), but is the most informative choice in this case.
Informative examples:
The status of only the Voice class can be queried:
AT+CCWA=1,2,1
If the command is successful, the A3LA-RM might return (after contacting the network):
+CCWA:1,1
If a remote caller tries to place a voice call to the A3LA-RM while it already has a call in
progress, and the Call Waiting service has been made active for class Voice, then the network
will send a message to the A3LA-RM. Then, if <n> has previously been set to ‘1’, the A3LA-RM
will send an unsolicited result code to the DTE, e.g.:
+CCWA:”+441223420024”,145,1
A.8.113 +CLCK – Facility Lock
Command
Possible Response(s)
+CLCK=
None (command ignored without error)
+CLCK=<fac>,<mode>[<passwd>[,<classx>]]
When command unsuccessful
