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SRTP

Created by: oej,Last modification on Wed 09 of Jul, 2008 [06:36 UTC] by hypherion
SRTP is a security profile for RTP that adds confidentiality, message authentication, and replay protection to that protocol. It is an action item in the IETF Audio-Video Transport Working Group, where it is an Internet Draft and is currently in IETF WG last call.

SRTP is ideal for protecting Voice over IP traffic because it can be used in conjunction with header compression and has no effect on IP Quality of Service. These facts provide significant advantages, especially for voice traffic using low-bitrate voice codecs such as G.729 and iLBC.

From the IETF RFC:


This document describes the Secure Real-time Transport Protocol
(SRTP), a profile of the Real-time Transport Protocol (RTP), which
can provide confidentiality, message authentication, and replay
protection to the RTP traffic and to the control traffic for RTP, the
Real-time Transport Control Protocol (RTCP).




Devices and Clients known to utilize SRTP:

  • Sipura sometime during early realeses of their 2.x firmware
  • pbxnsip supports SRTP and SDES/TLS
  • CounterPath Bria and eyeBeam softphones support SRTP and SDES/TLS
  • snom phones phones support SRTP and SDES/TLS
  • It seems that Cisco phones support SRTP (only skinny)
  • InGate was one of the first firewalls supporting SRTP
  • OpenWengo supports SRTP
  • Nokia Series 40 VoIP capable devices seems to support SRTP according to the implementation specifications
  • VegaStream supports SRTP adn SIP / TLS on its VoIP gateways

Comments

Comments Filter
222

333

by jburbage, Friday 10 of March, 2006 [21:55:55 UTC]
SRTP support is in development; there is an SVN branch for it. As of today they seem to be in the phase of testing and ironing out details, so I imagine the branch will be merged with the main SVN trunk and the functionality will be available in 1.4, though that's just my personal suspicion as I am in no position to make any official declaration. See the link below to keep up-to-date.

http://bugs.digium.com/view.php?id=5413
222

333Implemented??

by , Thursday 16 of December, 2004 [22:18:57 UTC]
Is SRTP available in asterisk? I understand the Cisco 7690 supports SRTP, so I'm interested in using the two for secure VoIP.
222

333The proposal is now a standard (RFC 3711)

by , Monday 23 of August, 2004 [19:22:27 UTC]
See http://www.ietf.org/rfc/rfc3711.txt