http://www.hybertone.com GSM Series Voice Gateway
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Each GoIP can operate in any of the following modes:
Prohibit: This mode is used when the GoIP operates independently.
Serve as the server:
When GoIP operates in this mode, the administrator only needs to provide the
user with a GSM number of the GoIP as a unique access number to the GoIP
group. In one GoIP group, only one GoIP gateway can be used as the server.
When the GoIP serves as the server, the GSM unconditional call forwarding or
busy call forwarding can be activated. The unconditional call forwarding is used
to forward all incoming calls to other clients of the group. The busy call
forwarding is used to forward incoming calls to other clients of the group when
the status of the SIM card of the server is ACTIVE.