Configuring Security Features
311
IDEA-CBC-SHA
DHE-DSS-RC4-SHA
RC4-SHA
RC4-MD5
EXP1024-DHE-DSS-DES-CBC-SHA
EXP1024-DES-CBC-SHA
EDH-RSA-DES-CBC-SHA
EDH-DSS-DES-CBC-SHA
DES-CBC-SHA
EXP1024-DHE-DSS-RC4-SHA
EXP1024-RC4-SHA
EXP1024-RC4-MD5
EXP-EDH-RSA-DES-CBC-SHA
EXP-EDH-DSS-DES-CBC-SHA
EXP-DES-CBC-SHA
EXP-RC4-MD5
The following figure illustrates the TLS messages exchanged between the Skype for Business
phone and TLS server to establish an encrypted communication channel:
Step1:
Skype for Business phone sends “Client Hello” message proposing SSL options.
Step2:
Server responds with “Server Hello” message selecting the SSL options, sends its public
key information in “Server Key Exchange” message and concludes its part of the negotiation
with “Server Hello Done” message.
Step3:
Skype for Business phone sends session key information (encrypted by server’s public
key) in the “Client Key Exchange” message.
Step4:
Server sends “Change Cipher Spec” message to activate the negotiated options for all
future messages it will send.
Skype for Business phones can encrypt SIP with TLS, which is called SIPS. When TLS is enabled
for an account, the SIP message of this account will be encrypted, and a lock icon appears on
the LCD screen after the successful TLS negotiation.
Summary of Contents for T46G Skype For Business Edition
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