Psion Teklogix 7527S User's Guide download pdf (Page 228)

Chapter 22: Wireless Wide-Area Networking

WWAN Supplementary Services

216 Psion Teklogix Mobile Devices SDK Developers Guide

22.11 WWAN Supplementary Services

Some WWAN networks support supplementary services.These services can complement both

voice calls and data services. Setting and querying each supplementary service takes between 30

and 60 seconds, as the Psion Teklogix computer must contact the WWAN network and wait for a

reply. The Mobile Devices SDK provides access to the following supplementary services, if they

are supported by your WWAN network:

Incall Supplementary Services

Call Hold

This service enables the subscriber to interrupt an ongoing call and then subsequently reestablish

the call. The call hold service is only applicable to normal telephony.

Call Waiting

This service enables the mobile subscriber to be notified of an incoming call during a call. The

subscriber can answer, reject, or ignore the incoming call. Call waiting is applicable to all GSM

telecommunications services using a circuit-switched connection.

Multiparty Service (Conference Calls)

The multiparty service enables a mobile subscriber to establish a multiparty conversation—that is,

a simultaneous conversation between from three to six subscribers. This service is only applicable

to normal telephony.

Explicit Call Transfer

This service allows a subscriber who has two calls to connect the other parties in those calls, and at

the same time disconnect themselves from the call. This service is only supported by the HC25

modem.

Other Supplementary Services

Call Forwarding

This service gives the subscriber the ability to forward incoming calls to another number if the

called mobile unit is not reachable, if it is busy, if there is no reply, or if call forwarding is allowed

unconditionally.

Calling Line Identification Presentation/Restriction (Caller ID)

These services supply the called party with the integrated services digital network (ISDN) number

of the calling party. The restriction service enables the calling party to prevent the presentation of

the number. The restriction overrides the presentation.

Call Barring

This service allows a subscriber to restrict selected types of calls. Typically these calls are: all in-

coming calls; all incoming calls when roaming; all outgoing calls; or, all outgoing

international calls.

This service is not supported by the Mobile Devices SDK; however, it is available through the

Control Panel.

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Psion Teklogix 7527S User's Guide Page 228