12 call holding services - +chld – Rainbow Electronics GM862-QUAD-PY User Manual
Page 101
AT Commands Reference Guide
80000ST10025a Rev. 5 - 09/07/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 101 of 434
3.5.4.3.12 Call Holding Services - +CHLD
+CHLD - Call Holding Services
SELINT 0 / 1
AT+CHLD=<n>
Execution command controls the network call hold service. With this service
it is possible to disconnect temporarily a call and keep it suspended while it
is retained by the network, contemporary it is possible to connect another
party or make a multiparty connection.
Parameter:
<n>
0 - releases all held calls, or sets the UDUB (User Determined User
Busy) indication for a waiting call.
1 - releases all active calls (if any exist), and accepts the other (held or
waiting) call
1X - releases a specific active call X
2 - places all active calls (if any exist) on hold and accepts the other (held
or waiting) call.
2X - places all active calls on hold except call X with which
communication shall be supported
3 - adds an held call to the conversation
Note: "X" is the numbering (starting with 1) of the call given by the sequence
of setting up or receiving the calls (active, held or waiting) as seen by the
served subscriber. Calls hold their number until they are released. New calls
take the lowest available number.
Note: where both a held and a waiting call exist, the above procedures
apply to the waiting call (i.e. not to the held call) in conflicting situation.
AT+CHLD=?
Test command returns the list of supported <n>s.
+CHLD: (0,1,2,3)
Note: consider what has been written about the Set command relating the
actions on a specific call (X).
Reference GSM
07.07
Note
ONLY for VOICE calls
+CHLD - Call Holding Services
SELINT 2
AT+CHLD=[<n>]
Execution command controls the network call hold service. With this service
it is possible to disconnect temporarily a call and keep it suspended while it
is retained by the network, contemporary it is possible to connect another
party or make a multiparty connection.
Parameter:
<n>
0 - releases all held calls, or sets the UDUB (User Determined User
Busy) indication for a waiting call. (only from version D)