Bintec-elmeg Elmeg T240 Provozní pokyny stáhnout pdf (Strana 11)

Note

If you set the pa ra me ter »Ter mi na te on inac ti vi ty« too high, this may re sult in con si der able costs for time-ba sed

char ges.

Note

If you have a flat rate char ge with your ISP you can de ac ti va te the pa ra me ter »Ter mi na te .

on inac ti vi ty«. In this case the PABX sys tem will not au to ma ti cal ly ter mi na te the In ter net con nec ti on, but will

re-estab lish the con nec ti on if re qui red (for ex am ple B: af ter being dis con nec ted by the ISP). If you have con fi gu red

se ve ral ISPs, make sure that you make this set ting for the cor rect ISP en try in the ISP list.

Terminating the connection to the internet

If the ISDN rou ter of the PABX sys tem de ter mi nes that the re is in co ming data from the In ter net the con nec ti on will

not be ter mi na ted au to ma ti cal ly when the set inac ti vi ty time ex pi res. This can re sult in con si der able costs, even

though you are not ac tu al ly using the In ter net con nec ti on. This can oc cur, for ex am ple, when a port scan is con duc -

ted to ward the ISDN rou ter of the PABX (fre quent ly the ad van ce sta ge of a ha cker at tack). A furt her pos si bi li ty is that

peer-to-peer file sha ring soft wa re has been run using the IP ad dress that was as sig ned au to ma ti cal ly to the ISDN rou -

ter of the PABX by the ISP. In this case, que ries for downloa ding fi les from the In ter net to the IP ad dress cur rent ly

being used for your In ter net con nec ti on can con ti nue to ar ri ve over an ex ten ded pe ri od of time. Alt hough the se que -

ries can not be re spon ded to they can not be tech ni cal ly pre vented ei ther.

Note

To en su re that no costs are char ged to you also use the Con trol Cen ter to ter mi na te the In ter net con nec ti on, or in hi -

bit the ISDN rou ter against au to ma tic con nec ti on to the In ter net (see Con trol Cen ter, Page 2). Also check af ter you

have swit ched off your PC to en su re that the ISDN LED in di ca tes that the con nec ti on has been ter mi na ted.

Note

When you use the ma nu al dis con nec ti on me thod via the Con trol Cen ter, the In ter net con nec ti on is ter mi na ted im -

me di ate ly when you click the but ton »Dis con nect«.

Using a fallback

Let’s as su me you have an ISDN con nec ti on with T-Com and have se lec ted T-On li ne as your ISP.

You have con fi gu red two ISPs:

· 1. In ter net ac cess over ISDN. The PABX sys tem will use an ISDN dial-up con nec ti on and the PPP

pro to col. En ter your ac cess data (mark the ISP in the list, field »Edit«, field »Ac cess data for T-On -

li ne«).

· 2. In ter net ac cess using an In ter net-by-call pro vi der. The PABX sys tem will use an ISDN dial-up

con nec ti on and the PPP pro to col. En ter any ot her re qui red data.

When the con fi gu red time pe ri od (in ter val) ex pi res the PABX sys tem at tempts to set up an In ter net con nec ti on as of -

ten as con fi gu red in the field »Con nec ti on at tempts«. You can de fi ne the time bet ween at tempts un der »Con nec ti on

at tempts« »In ter val« un der the con fi gu ra ti on item »Net work« »In ter net«, »In ter net ac cess«. You can set the »Num -

ber« for each ISP that has been con fig ured.

Af ter that, the PABX sys tem will use the next ISP con fi gu red in the list for at temp ting to set up a con nec ti on.

IP address allocation Des crip ti on of the ISDN rou ter functions

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Bintec-elmeg Elmeg T240 Provozní pokyny Strana 11