27 Nov
2012
27 Nov
'12
11:16 p.m.
Hi, If you are using SRTP your conversations will be encrypted, so nobody
could eavesdrop it. Only if your Kamailio was compromised they could be
eavesdropped.
I think you are confusing SRTP (media) with signaling (SIP). You should
implement SIP over TLS too, it makes no sense to use SRTP without encrypt
signaling. If not, it could be possible to sniff conversations with a MiTM
but, anyway, I don't know any tool which supports it.
Here I speak a bit about VoIP encryption, I think it could help you:
http://nicerosniunos.blogspot.com.es/2011/08/voip-eavesdropping-counter-mea…
Best regards.
2012/11/27 Mino Haluz <mino.haluz(a)gmail.com>
Hi,
maybe it is not that kamailio related question, but I dont know any other
place with such good voip professionals ;) I have kamailio and mediaproxy.
Clients are BudgetTone 200 (Grandstream) and CSipSimple. I am forcing
clients to use SRTP but it does not support adding any certificate on both
sides. SRTP call is working fine.
The question is, in this case, is man-in-the-middle attack possible? Maybe
I should study SRTP more, but basically, if there are no certificates,
there is no method how to be 100% sure that the media goes directly between
clients. Is it true?
Thanks for response,
Mino
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Jesús Pérez
VoIP Engineer at Quobis
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