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Re: Securing VOIP?
From: "Jon O ." <jono () microshaft org>
Date: Mon, 15 Oct 2001 16:35:07 -0700


You should probably also consider the risks of sniffing as this tools shows:

http://vomit.xtdnet.nl/

The vomit utility converts a Cisco IP phone conversation into a wave file that can be played with ordinary sound 
players. The phone conversation can either be played directly from the network or from a tcpdump output file. Vomit is 
also capable of inserting wavefiles into ongoing telephone conversations. Vomit can be used as a network debugging 
tool, a speaker phone, etc ... 

http://vomit.xtdnet.nl/




On 15-Oct-2001, reberc () post ch wrote:
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
Handy:        ++41 (0)79 211 01 48
Fax:  ++41 (0)31 338 74 92
e-Mail mailto:reberc () post ch

visit our homepage:
http://pww.post.ch/oe/IP/corp//index.htm (intern)
http://www.post.ch (extern)


There was a belief that it was going to be easy. They were wrong!


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This list is provided by the SecurityFocus Security Intelligence Alert (SIA)
Service. For more information on SecurityFocus' SIA service which
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https://alerts.securityfocus.com/


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