Microsoft files EU Android complaint

[James Knott]

D. Hugh Redelmeier wrote:
> Forgot to mention, SIP support IPSec, for encrypted calls.
>
> SIP doesn't support IPSec, IPSec supports SIP and essentially all
> other IP protocols.

While SIP can certainly travel over an IPSec VPN, and I have set that 
up, that's not what I was referring to.  IPSec can also be used directly 
by applications, without a VPN.

>From 
http://www.softwell.se/index.php?option=com_content&view=article&id=82&Itemid=131

"A successful IMS AKA Registration is accomplished by two SIP Register 
request messages sent to the subscriber's S-CSCF and two SIP Register 
response messages to the requesting subscriber. Information neccesary to 
performa authentication and set up the two IPsec channels are provided 
in the SIP message headers. Some of the SIP message headers are specific 
for IMS."

With this, the connection is set up to use IPSec, for carrying the 
connection.

And this:
http://pic.dhe.ibm.com/infocenter/wvraix/v6r1m0/index.jsp?topic=%2Fcom.ibm.wvraix.voip.doc%2Fipsec.html

Or from this book:
http://www1.avaya.com/pc/SIP_for_Dummies.pdf

Pg 45
"Secure Real-Time Transport Protocol (SRTP) or IP Security (IPSEC) using 
Advance Encryption Standard (AES) encryption to provide authentication, 
cofigentiality, and integrity for protection of the media

And here's some info on SRTP:
https://en.wikipedia.org/wiki/Secure_Real-time_Transport_Protocol

SIP normally uses Real Time Protocol (RTP) to carry a call, but it can 
also use SRTP to provide end to end encryption of the call. That is 
right from one phone to the other, encrypted all the way.

So, bottom line, IPSec *IS* supported by SIP.

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