-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 2012-08-25 16:06, Per Jessen wrote:
Carlos E. R. wrote:
I don't have field experience with asterisk, only some training. Reading the documentation I understood it was a risk, but I don't recall exactly why. On a bussiness you might get a call from a longtime and good client, dispatch a cargo to be charged 30 days later, and then learn it was a fired employee or someone from a rival company, faking the ID on the phone. Yes, it is social engineering, but trusting the number you see in your terminal is part of the issue.
But that goes for POTS too, it isn't specific to Asterisk or VOIP.
At least here the ID via POTs could be trusted, the network was closed.
I don't think anyone has ever called me using purely VoIP, but running an Asterisk server that refuses inbound SIP calls seems like having a POTS PBX that doesn't accept external calls.
No, you accept calls identified by the Telco.
One security risk with Asterisk is perhaps external SIP-clients. We have a number of people who primarily work from home. They're all have office phones at home, connected to the Asterisk box over VoIP over the internet.
Two risks -
1) the SIP sign-on (userid+password) is, AFAIK, not encrypted, so it could be intercepted, giving someone access to use our internal system. 2) brute force attack trying to guess the password. It is easily countered, but we had a case last year where someone managed to guess a SIP userid+password. It meant a slightly higher phone-bill that month :-)
You can encrypt both login data and conversations (two separate configs). We did that during my training. - -- Cheers / Saludos, Carlos E. R. (from 12.1 x86_64 "Asparagus" at Telcontar) -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAlA4544ACgkQIvFNjefEBxqaSQCdEmaCIIwmZa8sTFr4rT1FdTPK jfgAoIAjsfACiZ5GxBVPio6jn9Pl+xmX =c1ei -----END PGP SIGNATURE----- -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org