where I work we use the Ozeki Phone System XE (http://www.ozekiphone.com), that supports SRTP and other secure ways of telecommunication. We are satisfied with the service, there has never been any successful attacks against us.
You are both very welcome! Telecommunications is a big part of my life (8:00am-4:00pm, Mon-Fri), and it certainly is enjoyable to be able to discuss the VoIP side of things with like-minded people on InternetEvolution. Keep the discussions coming and I shall do the same. :-)
You are both very welcome! Telecommunications is a big part of my life (8:00am-4:00pm, Mon-Fri), and it certainly is enjoyable to be able to discuss the VoIP side of things with like-minded people on InternetEvolution. Keep the discussions coming, and I shall do the same. :-)
Thanks for the expanded reply, Nathan... seems like we're headed to encrypted everything, especially if all this cloud hype is true (or maybe I just drank too much of the Kool-Aide at RSA this week).
"One last note: SIP trunking allows companies to keep legacy equipment and transition to all-IP incrementally. This fact alone has gotten the attention of many large enterprises with significant analog telecom equipment investments."
Great question. I've worked in the VoIP/telecom industry since 2005 (and have studied telecommunications as a hobby - mostly TDM networks, mobile, pager networks since 1997).
To answer your question; yes, SRTP is supported by some carriers, though to be perfectly honest with you not too many do. If you're looking for a decent carrier (many will be resellers of CLECs or resellers of resellers of CLECs), keep your eyes peeled for VoIP SIP-providers that support these as well:
SIPS, MIKEY, SDES, and IPSec.
Currently my employer supports IPSec encryption for SIP signalling and the RTP.
--
Miscellaneous:
For anyone looking to setting up their own PBX (Private Branch Exchange - think: that IVR system that you reach when you call any major business which includes voicemail, call forwarding, call waiting, and in some cases conferences services), then I highly recommend taking a look at these:
FreeSwitch (highly recommended), TrixBox (based upon Asterisk), FreePBX, AsteriskNOW.
If you're someone who wants control over packet routing engine with SIP and you plan to implement it on a carrier-grade VoIP Switch, check out OpenSIPS.
Though any soft phone (I recommend X-Lite and SJPhone) or device (Hardphone, ATA) will work fine so long as they support the SIP protocol. Try to stay away from the IAX2 protocol by Digium (creators of Asterisk) if you can; it has its stability/memory issues after about 100 calls... and is only recommended for small business users. The SIP implementation on Asterisk is fine and is more flexible for a variety of platforms.
Thanks for joining the conversation, Terry. Secure RTTP is virgin territory for me. I haven't taken a dive into that tech pool yet. I'm guessing (just guessing) that algorithm layers and authentication/encryption take a bite out of performance... but, with an optimized set-up (e.g. dedicated channels, QoS etc), that effect could be eliminated.
Thanks for your interest, Chris. When you talk about providers, there are really three layers to SIP trunking. 1) infrastructure (companies like Qwest, Global Crossing, AT&T and Verizon offer MPLS networks that are end-to-end IP), 2) hardware manufacturers that make IP-PBX equipment (like 3COM, Cisco, Siemens, Nortel, Avaya), then 3) the user interface co's mentioned in the article (Microsoft OCS and Cisco UCM).
There are plenty of other "piggy-back" and/or parallel service providers and manufacturers playing in this space, as well. It's evolving rapidly.
The fact that expensive/complex gateways are not required is notable. End-to-end IP brings the cloud or client/server metaphor to telephony. It's like a managed service rather than a premise-based hassle. Once you're cleanly connected to the infrastructure, the software becomes much more important (in terms of matching utility with user demands).
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