Call Parking can be accomplished by two basic scenarios. The first, is to send the caller to a
general parking lot, where the exact parking space is determined by the provider. For purposes of identification,
we will call this "Public Parking". The second type, is to transfer the call to an exact parking space, which we
call "Private Parking". Most VoIP providers offer either one type or the other. Flexible buttons on the handset
are usually programmed to accomplish the codes needed to place a call on park and retrieve parked calls.
When a caller is parked in the cloud, the call path is terminated from the caller to the on-site location.
The Vertex unit sees a Bye SIP Packet and sends the termination call record. When the call is retrieved from park, the Vertex
must see an Invite from the cloud server in order to recognize that a new call path has been re-established.
When a caller is parked in a public lot, the cloud server simply puts the parked call in a parking queue.
Although an extension is assigned by the server, it may not be readily apparent. When multiple calls are parked, retrieval
of a particular caller may be difficult. Only the next call in queue would be easy to retrieve.
When a parked call is retrieved from a Public Parking queue, the cloud server does not send a SIP Invite packet.
Therefore, the Vertex will not recognize that the call has been re-established and will not send a Caller ID record.
Transferring the caller to a specific extension (parking space) allows easy retrieval of a particular parked caller.
Flexible buttons (FB) can be programmed to transfer callers to exact parking extensions. These same buttons, can be used to retrieve
the caller. For example, FB1 parks a call at x501, FB2 parks a call at x502, etc. Retrieval for a particular caller is as simple as
selecting the FB used to park the caller. Flexible button lamps can be used to identify parked callers. Once a call is parked, the
FB used to park the call lights up. Upon retrieval, the light goes off.
When a parked call is retrieved from a Private Parking space, the cloud server sends a SIP Invite packet. This allows the Vertex
to report the Caller ID information of the retrieved call.
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