however, that statement (TCP gives TLS) is no longer true since TLS
over UDP (DTLS) is now defined (RFC4347) and sip using DTLS is in draft.
Marc.
Le 06-07-14 à 09:08, Enzo Michelangeli a écrit :
----- Original Message ----- From: "Bret McDanel" <[EMAIL PROTECTED]>
Sent: Friday, July 14, 2006 9:05 PM
On Fri, 2006-07-14 at 05:49 -0700, vivek relan wrote:
Hi everybody,
If we add the TCP support to the Asterisk, will it
provide same voice quality and what will be the impact on delay,
security and performance ?
Waiting for the suggestion !!!
If you have a dropped packet it will cause horrible delay until that
packet is retransmitted. Basically its not advisable for things that
can tolerate some packet loss and require 'real time' processing.
Well, TCP should be used as transport for the SIP signalling,
rather than for the media data. The main advantage of using TCP is
that TLS becomes immediately available as security layer ("sips"
URI's) so the session key used to secure the media data with SRTP
(http://srtp.sourceforge.net/srtp.html ) can be easily transmitted
as cleartext (encapsulated in TLS) rather than having to rely on
awkward content encryption schemes such as S/MIME.
Of course, this all applies to SIP sessions, not IAX2.
Enzo
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IPv6 book: Migrating to IPv6, Wiley, 2006. http://www.ipv6book.ca
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