Di Al-In In To The Lan (Ras); Ras Call Back - elmeg T444 User Manual

In tro duc ti on
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Using xDSL (for ex am ple: SDSL) in con juncti on with a DSL mo dem that is com pa ti ble with your ISP with a
set, pub lic IP ad dress. The se con nec tions re qui re the pub lic IP ad dress that you have been as sig ned, the IP
ad dress of the next gate way (next hop) and the IP ad dress for the name ser ver of your provider.
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Tun ne ling. Here, data pa ckets of one pro to col are pa cked into the shell of a dif fe rent pro to col to rou te them
on to the In ter net. At the re ci pient the shell is then re mo ved and the data pa cket rou ted on with the ori gi nal
pro to col. This tun ne ling is used to over co me in com pa ti ble net works, or when ta king into con si der ati on se -
cu ri ty and cost aspects (for ex am ple PPTP). Nor mal ly, you only need your user name and pass word as ac -
cess data. In di ca te all the data that is also spe ci fied to you by your pro vi der (for example, number, IP
address and DNS server.
The ISP that you wish to use for your In ter net con nec tions is set in the con fi gu ra ti on of the PABX sys tem. You can
con fi gu re up to 10 ISPs. You can then de fi ne furt her set tings for each ISP, such as user name, pass word, pho ne num -
ber, etc.. You can also de fi ne whet her the con nec ti on to the In ter net is to be set up au to ma ti cal ly (de fault set ting) and
that the next ISP in your list is to be se lec ted once the con nec ti on has been estab lis hed (fall-back).
When the PABX sys tem rou ter re cei ves the com mand to estab lish an In ter net con nec ti on this con nec ti on is set up
using the first ISP in your list. If the con nec ti on is set up suc cess ful ly all of the clients in your net work can ac cess the
In ter net. If the In ter net con nec ti on is no lon ger nee ded (inac ti vi ty) it is ter mi na ted af ter a de fi ned time.
If an In ter net con nec ti on can not be set up using the se lec ted ISP an at tempt is made to estab lish the con nec ti on using
the next ISP in your list (fall-back).
When an In ter net con nec ti on is ter mi na ted, the first ISP in the list is used when the next con nec ti on at tempt is in iti -
al ly car ried out.
Note
For more in for ma ti on about con fi gu ring ISPs and estab lis hing an in ter net con nec ti on, re fer to the operator's ma -
nu al of your PABX.
Note
If "hubs" are in stal led in your net work, for ex am ple, or if a con nec ti on to the In ter net still exists, data pa ckets may
con ti nue to be sent to the rou ter and the con nec ti on can not be ter mi na ted.

Di al-in in to the LAN (RAS)

Using the Re mo te Ac cess Ser ver (RAS) a field re pre sen ta ti ve, for ex am ple, can call into the lo cal net work from an ex -
ter nal lo ca ti on and then via the lo cal net work ac cess the In ter net. Ac cess from an ex ter nal lo ca ti on is also pos si ble via
an ISDN con nec ti on.
Ex ter nal ac cess is pro vi ded with user-name and pass word pro tec ti on. If the call is made from an ex ter nal lo ca ti on
only, the pho ne num ber can also be mo ni to red as an ad ded pro tec ti on fea tu re. Ac cess can be en ab led for up to 8
users. A Wind ows en ab le (ac cess to com pu ter, fi les or prin ters) and In ter net en ab le can also be con fi gu red for each
user.
A PC that di als into the lo cal net work via RAS is au to ma ti cal ly as sig ned an IP ad dress by the in te gra ted DHCP ser ver.

RAS Call back:

If you do not want to be char ged for con nec tions wit hin your com pa ny net work you can con fi gu re the RAS con nec ti -
on as an au to ma tic call-back. For this, a brief con nec ti on is set up to the com pa ny net work (for which you are char -
ged) that then in itia tes a call-back. The PABX sys tem at your com pa ny then calls you back and you are not char ged
for the en suing con nec ti on time. You can en ter a num ber for the cor re spon ding RAS con nec ti on in the con fi gu ra ti -
on. Au to ma tic call-back is then only pos si ble from this num ber. If you do not en ter a num ber here, the au to ma tic
call-back can be made from any num ber.
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Di al-in in to the LAN (RAS)