Multitech MTCMR-H User's Guide download pdf (Page 101)

Chapter 3 – Supported GSM/WCDMA AT Commands

High Speed HSPA-H4 AT Commands Reference Guide (Document S000483A) 101

+CHLD Call Related Supplementary Services

Description: This command manages call hold and multiparty conversations (conference calls). Calls can

be put on hold, recovered, released or added to a conversation.

Call hold and multiparty are only applicable to teleservice 11 (speech telephony)

Syntax:

Command Response

Action Command:

AT+CHLD=< n >

Read Command:

AT+CHLD?

Test Command:

AT+CHLD=?

+CHLD: (list of supported

<n>s)

Values: <n> Call-Related Services

0 Release all held calls or set User Determined User Busy (UDUB) for a waiting call

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

1x Release a specific call X (active, held or waiting)

2 Place all active calls (if any exist) on hold and accept the other (held or waiting)

call

2x Place all active calls on hold except call X with which communication is supported

3 Add a held call to the conversation

4 Connects the two calls and disconnect the subscriber from both calls (Explicit Call

Transfer)

Parameter Storage: None

Examples:

Command Responses

AT+CHLD=? +CHLD: (0-4, 11-17, 21-27)

ATD0123456789; OK

+WIND: 5,1

AT+CLCC +CLCC: 1,0,0,0,0,"0123456789",129

+WIND: 5,2

Note: incoming call in waiting state

AT+CLCC

Note: Com id 1 is active, com id 2 is in waiting

state

+CLCC: 1,0,0,0,0,"0123456789",129

+CLCC: 2,1,5,0,0

AT+CHLD=2 OK

AT+CLCC +CLCC: 1,0,1,0,0,"0123456789",129

+CLCC: 2,1,0,0,0

Note: Com id 1 is held, com id 2 is

active

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