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SCOOPY+ S - User Manual
4.5.5. Receiving calls
Actually there is no additional setting to do for receiving calls. Incoming calls are automatically accepted
by the SCOOPY+ S, with some differences depending on the type of network involved.
ISDN incoming calls
When the 5A System is active, receiving calls is simple. When a call is received, the codec automatically
"unhooks" and recognises the coding algorithm and protocol used, and finally sets the link
automatically. In simple words, the unit "follows" the calling unit.
When the 5A System is not active, you should first configure the codec for the desired coding algorithm
and configuration. When a call is received, the unit will synchronise with the calling device, but the link
will usually fail if the calling party has used another coding configuration than expected. However, if J52
is used by both parties, the link will succeed even without 5AS active.
If an ISDN line is connected but this line is not the current network interface, the SCOOPY+ S will
however accept incoming ISDN calls, provided that it is not already busy with another connection.
Once the connection is released, the Scoopy+ S will come back to its previous default interface.
AoIP incoming calls
Such calls are accepted if they are presented on the interface that is selected as default for outgoing
calls. However, there is an exception: while the current interface is the ISDN or the POTS line, the unit
can still register on a SIP server via the Ethernet interface, and it can accept calls presented on this
interface (either directly or via a SIP server).
Receiving SIP incoming calls is very simple, regardless if it is a direct peer to peer link or a call via a SIP
server. There is nothing to do… When a call is received, the units negotiate automatically a commonly
acceptable coding algorithm, and set the link automatically. On the receiving side, the SCOOPY+ S
"follows" the calling unit preference.
Direct RTP incoming calls are less straightforward to set up, because the unit must be set up beforehand
with exactly the same coding configuration as the calling device. In addition, the caller must be aware, in
addition of the IP address of the SCOOPY+ S to call, of the port used for the RTP transmission. More
explanation about the operation with Direct RTP is provided in the section related to the AoIP settings:
4.4.1, "AoIP Parameters" section.
For being able to receive a Direct RTP call, the Direct RTP Accept must be active. As a shortcut for
switching this parameter on/off, dial "0" (a pop-up message briefly shows the new setting).
POTS incoming calls
When the call comes in, the codec "unhooks" and the link is established after a negotiation of the bit
rate between the two involved units (this phase may last several seconds).
84


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