12 call holding services - +chld – Rainbow Electronics GM862-QUAD-PY User Manual

Page 101

AT Commands Reference Guide

80000ST10025a Rev. 5 - 09/07/08

page 101 of 434

3.5.4.3.12 Call Holding Services - +CHLD

+CHLD - Call Holding Services

SELINT 0 / 1

AT+CHLD=

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:

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 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=[]

Busy) indication for a waiting call. (only from version D)