Securing VOIP?

[reberc () post ch]

Hi 

I have to review our concept for implementing VOIP. I have to make sure, that all security issues are covered. If 
anybody could give me some help on this question:

Our provider says, that we need no firewall for VOIP because our Voice Gateway receives only PRI requests/transfers. He 
says that it is possible to restrict the Voice Gateway for only PRI-Traffic and that it is impossible to bring data 
along with PRI. The PRI is always converted to voice. Now I have seen, that you can send Voice, Video and Data on PRI. 
Is it really necessary to have an Firewall between our CallManager and Voice Gateway or can I trust the provider and be 
sure, that nothing else (IP-Transfers) is coming over this line? 

Many thanks in advance!

Claudia Reber
IT-Security Officer

Die Schweizerische Post
Information Technology Services
IT5 IT-Security
Webergutstrasse 12
CH-3030 Bern (Zollikofen)

Tel:    ++41 (0)31 338 16 44
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Fax:    ++41 (0)31 338 74 92
> e-Mail mailto:reberc () post ch
>
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There was a belief that it was going to be easy. They were wrong!


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