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16 data circuit sync
32 data circuit async
64 dedicated packet access
128 dedicated PAD access
<number>: string type phone number of calling address in format specified by <type>
<type>: type of address octet in integer format (refer +CMGS subclause, the definition of
type_addr)
<reserved>: optional string type alphanumeric representation of <number> corresponding to
the entry found in phonebook.
<CLI validity>:
0
CLI valid
1
CLI has been withheld by the originator.
2
CLI is not available due to interworking problems or limitations of originating
network.
When CLI is not available (<CLI validity>=2), <number> shall be an empty string ("") and
<type> value will not be significant.
6.4 Call related supplementary services +CHLD
6.4.1 Command Syntax
Command
+CHLD=[<n>]
+CHLD=?
6.4.2 Description
This command supplies operation for call related supplementary services.
The default value of <n> is 2. If <n> is not provided it equals +CHLD =2 .
It is recommended (although optional) that test command returns a list of operations
which are supported. The call number required by some operations shall be denoted
by "x". The range of x is 1-9.
6.4.3 Defined Values
<n>
0
call.
Issue 18 (2009-06-22)
Possible response(s)
<CR><LF>OK<CR><LF>
or
<CR><LF>+CME ERROR: <err><CR><LF>
<CR><LF>+CHLD: (list of supported
<n>s)<CR><LF><CR><LF>OK<CR><LF>
Releases all held calls or sets User Determined User Busy (UDUB) for a waiting
Commercial in Confidence
HUAWEI UMTS M2M Module V100R001
AT Command Interface Specification
Page 94 of 169
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