Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 514)

Supplementary Services Commands
Call Related Supplementary Services +CHLD
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WM_DEV_OAT_UGD_049 - 001 VOLUME 3 August 23, 2007
20.2.3 Parameters and Defined 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 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 add a held call to the conversation.
4 connect the two calls and disconnect the subscriber from
both calls (Explicit Call Transfer).
20.2.4 Parameter Storage
None.