Westermo GDW-11 - Manual (Page 127)

Supplementary Services commands 127 6615-2220
+CHLD – Call related supplementary services
Description:
This command is used to manage call hold and multiparty conversation (conference call).
Calls can be put on hold, recovered, released or added to a conversation.
Syntax:
AT+CHLD=
Parameters:
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 accepts 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 accepts the other (held or waiting)
call.
2X: Place all active calls on hold except call X with which communication is supported.
3: Adds a held call to the conversation.
4: Connects the two calls and disconnects the subscriber from both calls
(Explicit Call Transfer).
Command example Possible responses Note
AT+CHLD=1 OK Release all held calls
AT+CHLD=? +CHLD: (0-4, 11-17, 21-27) Possible values
OK