AFAIK, the Cisco/Linksys SPA series ATAs do not support SDES key exchange to appropriately support SRTP and FreeSWITCH. They do their proprietary Sipura key exchange only, not sure if Cisco plans on upgrading the firmware to ever support SDES on the ATAs. They added support for SDES to their IP Phones about 1 year ago, but nothing has happened with the ATAs as of yet. Gabe On Thu, Dec 3, 2009 at 2:05 PM, Mark Campbell-Smith <mcampbellsmith@gmail.com> wrote:
Hi All,
I managed to borrow a SPA3102 with the latest firmware and have got it to register using TLS, but I am still struggling with SRTP. Has anyone managed to get SRTP working with the Linksys devices and if so, can they direct me on how to do this.
I have generated a mini-certificates and SRTP Private Key using the gen-mc tool found at http://www.megajournal.ru/journal/users_data/11049/msg_files/24120/gen-mc.c-.... However, when ever I initiate a call from the SPA, I can see that the call is not encrypted.
Help appreciated.
Thanks!
On Sat, Nov 28, 2009 at 6:31 AM, eman <eman@chabotel.com> wrote:
Check out the Linksys SPA2102
On Wed, Nov 25, 2009 at 3:34 AM, Mark Campbell-Smith <mcampbellsmith@gmail.com> wrote:
The only ATA mentioned on the WIKI that supports TLS/SRTP is the Grandstream HandyTone 503. But, again according to the wiki, that doesn't seem to behave to well with TLS ...
On Wed, Nov 25, 2009 at 7:14 PM, Jason White <jason@jasonjgw.net> wrote:
Mark Campbell-Smith <mcampbellsmith@gmail.com> wrote:
Does the SPA3102 support TLS or only SRTP?
I don't know, but supporting only SRTP would be ridiculous, since the keys would then be transmitted in the clear and therefore amenable to interception. SRTP requires the SIP channel to be encrypted by TLS in order to be secure. ZRTP, on the other hand, doesn't have this limitation: it works entirely in RTP.
I would be rather surprised were a hardware manufacturer to implement SRTP without TLS for the SIP traffic. On the other hand, we've seen often in this forum that some manufacturers are really clueless...
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