Network Settings; Allow Voip Over 3G; Maintain 3G Connection - Aastra AMC 3 User Manual

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12.4 Network Settings

Unlike Wi-Fi connections, cellular connections cannot carry data. A data channel is not

necessary to make use of certain services, such as accessing PBX (in-call) features,

but it makes signaling faster. Availability of data channels depends on your provider and

on your contract. Many contracts come with a certain amount of data trafﬁc included

Packet Data.

The Packet Data settings described here allow you to determine if and how the AMC

is allowed to use cellular Packet Data. You can choose to generally disable it for the

AMC (Off ), use it exclusively for HTTP(S) requests (Minimal, i.e. Corporate Contacts

access, HTTPS Callbacks etc.), or allow its usage only in your provider's network (Local

Network ). To use it whenever needed for a system registration (no Voice over 3G) set

this to GPRS Dynamic.

Local Network + Roaming = Minimal

Please note that while in roaming in other provider networks and while the

setting Local Network is active, the actual usage of the cellular data channel

is done according to the setting Minimal, i.e. registrations are not possible

and only HTTP(S) requests are allowed.

The checkbox Allow VoIP over 3G allows incoming and outgoing VoIP calls to be estab-

lished over Packet Data connections. It also keeps a packet-data connection open even

if the screen backlight is turned off by the operating system due to user inactivity. This

enables a constant system registration and with it, succesfull receptions of incoming

responses to service requests, e.g., Call Reverse etc.

The setting Maintain 3G Connection is a subset of Allow VoIP over 3G, i.e., it keeps

packet-data connections open even if the backlight is turned off, but it does not allow this

connection to be used for VoIP. Maintain 3G Connection is enabled automatically if the

setting Call Reverse (refer to 12.7.9) is enabled. Please note that without enabling either

of these two settings, a packet-data connection is interrupted whenever the backlight is

turned off.

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12 Administrator Settings

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