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connection the B channel reverts automatically to use for the Internet connection. This function is available for inco-
ming and outgoing voice links.
This performance feature requires that the ISDN Speed Manager be installed, or that Internet access is made via the
router! The Speed Manager is included in the T-Online installation.
Completion of call to busy subscriber:
You can not be reached by an external telephone call when you are surfing the Internet and are using two B channels
for downloading. As signaling of a further call is made via the D channel, your telephone system has the capability of
specifically de-activating one B channel (depending on current settings) so that you can take a call. You can define the
following settings in the PC Configurator.
Rejecting a call:
The caller will hear the busy signal and both B channels remain active.
Internal MSN extension number:
One B channel is de-activated (the call briefly hears music on hold, see also Page ) and the call is signaled at the sub-
scriber entered under »Internal number«. This terminal device may not be located on the same ISDN bus or at the
same USB port as the PC.
Forwarding (Call Deflection) to an external extension number :
One B channel is de-activated and the call signaled at the subscriber entered under »External number«. You can also
have the call forwarded to an external subscriber by the exchange, allowing both B channels to remain active. Calls
can also be transferred (for example for T-NetBox or cell phone) without a B channel of the telephone system being
allocated.
Normal call distribution:
One B channel is de-activated and the call signaled at the subscriber entered under »Call allocation« for the »External
number«.
Dynamic ISDN for all outgoing calls
You can not make an outside call if you are surfing in the Internet while using two B channels for downloading. Ho-
wever, depending on the PC configuration, your telephone system does have the capability to specifically de-activate
one B channel so that you can make calls while connected to the Internet.
DHCP server
PCs can be provided with a major portion of the configuration required for LAN and Internet access via the DHCP
(Dynamic Host Configuration Protocol). The DHCP server integrated into the PABX is capable of supplying corre-
sponding configurations to several PCs (LAN-clients). IP addresses are dynamically allocated to the clients. This
mode is recommended to dispense with the complicated, manual configuration of the IP addresses for the PC that
would otherwise be required.
DNS server
The DNS server (Domain Name Server) has the task of establishing names within a network. In this process the IP ad-
dresses of the PCs (e.g. LAN clients) are transformed into names. You must therefore know the name, and not the IP
address, of a PC that you wish to access, or are searching for. The DNS server can also establish names that are not in-
cluded in the local network.
DNS-Proxy
A proxy assumes a surrogate function for the local network (LAN) in a different / external network. Here, the DNS
proxy accepts the name queries from the LAN client and submits them to the external network, e.g. Internet, as its
Router functions Introduction
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