coM.sat ISDN Basic UMTS
coM.sat ISDN Basic UMTS
coM.sat ISDN Basic UMTS
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<strong>coM</strong>.<strong>sat</strong> <strong>ISDN</strong> <strong>Basic</strong> <strong>UMTS</strong><br />
3.3.12.3 Call Hold<br />
During an active call, dialling the configured hold request digit(s) causes the audio<br />
connection to be disconnected. The held user gets a hold tone or announcement<br />
(march root tone / calling announcement for outgoing call) while the holding user<br />
hears a dial tone or announcement. The user who has invoked the hold function now<br />
is able to dial any other number, i.e. an internal or external one. This number is<br />
dialled using DTMF tones. During dialling, it is not possible to retrieve the held call,<br />
because the retrieve digit would be evaluated as called party number. Only if the new<br />
called number is complete and the call proceeds, it is possible to hold (again),<br />
retrieve or transfer a call.<br />
When there is a mistake during dialling, terminate dialling by use of the ‘#’ character<br />
and hold it again to repeat dialling. It is not necessary to retrieve the held call before<br />
holding it again, but it is of course possible (e.g. to notify the calling person).<br />
If the held user is connected via GSM/<strong>UMTS</strong>, the call is held using the GSM/<strong>UMTS</strong><br />
hold service. The GSM/<strong>UMTS</strong> user will hear the network specific call held<br />
announcement. If the holding party calls another GSM/<strong>UMTS</strong> number, this new call<br />
uses the same GSM/<strong>UMTS</strong> channel that was used by the first call. This ensures that<br />
the second channel is still available for other calls and it also allows to connect the<br />
two GSM/<strong>UMTS</strong> users inside the GSM/<strong>UMTS</strong> network on call transfer without<br />
occupying any of the gateway’s GSM/<strong>UMTS</strong> channels.<br />
3.3.12.4 Call Retrieve<br />
A held call can be retrieved if the call to the third party is proceeding or connected. In<br />
this case, dialling the preconfigured retrieve request digit(s) causes the third party to<br />
be disconnected and the audio connection to the held user to be reestablished.<br />
A connection to the newly called user is not necessary. If the held call is retrieved<br />
during alerting, the alerting stops.<br />
3.3.12.5 Call Transfer<br />
A held call can be transferred when the call to the third party is proceeding or<br />
connected. In this case, dialling the preconfigured transfer request digit(s) by the<br />
holding party causes the holding party to be disconnected and the audio connection<br />
between the held and the third user to be established. Transfer is also initiated if the<br />
holding party hangs up. A connection to the newly called user is not necessary. If the<br />
call is transferred during alerting, the alerting continues and the held caller still gets<br />
the call held tone.<br />
If the held user and the third user are both GSM/<strong>UMTS</strong> users, they get connected by<br />
the GSM/<strong>UMTS</strong> network internally, and the gateway’s GSM/<strong>UMTS</strong> channel is<br />
available for other calls again.<br />
Note: A GSM/<strong>UMTS</strong> network internal call transfer is not offered by all network<br />
providers. If it is offered, the service invoke string is not identical for all networks.<br />
Therefore it has to be configured properly (“transfer code”, see below).<br />
created: page: file:<br />
11/04/07 50 <strong>coM</strong><strong>sat</strong> <strong>ISDN</strong> <strong>Basic</strong> Manual <strong>UMTS</strong>.doc<br />
Note Protection Mark according to DIN 34!
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