command with other commands based on other GSM/UMTS supplementary services is described in the GSM/UMTS standards.

Note!_ Call Hold and MultiParty are only applicable to teleservice 11.

It is recommended (although optional) that test command returns a list of operations which are supported. The call number required by some operations is denoted by “x” (e.g. +CHLD: (0,0x,1,1x,2,2x,3)).

<n>

Description

 

 

...

Integer type; equals to numbers entered before SEND

 

button in GSM 02.30 subclause 4.5.5.1

0Releases all held calls or sets User Determined User Busy (UDUB) for a waiting call

0X

Releases a specific call X from a held multiparty call

1Releases all active calls (if any exist) and accepts the other (held or waiting) call

1X

Releases a specific active call X

2Places 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 is supported

3Adds a held call to the conversation

4Connects the two calls and disconnects the subscriber from both calls (explicit call transfer)

“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. Where both a held and a waiting call exists, the above procedures shall apply to the waiting call (i.e. not to the held call) in conflicting situation.

Note!_ The “directory number” case shall be handled with dial command D, and the END case with hangup command H (or +CHUP).

16.14AT+CLIP Call Line Identification Presentation

Owner’s Manual

Rev 1.0

Page 265 of 265