Transport Layer Security
Transport Layer Security (TLS) is a standard protocol for securing and authenticating communications over
the Internet. SIP over TLS encrypts the SIP messages between the service provider SIP proxy and the end
user. SIP over TLS encrypts only the signaling messages, not the media.
TLS has two layers:
•
TLS Record Protocol
—
Layered on a reliable transport protocol, such as SIP or TCH, this layer ensures
that the connection is private through use of symmetric data encryption and it ensures that the connection
is reliable.
•
TLS Handshake Protocol
—
Authenticates the server and client, and negotiates the encryption algorithm
and cryptographic keys before the application protocol transmits or receives data.
The Cisco IP Phone uses UDP as the standard for SIP transport, but the phone also supports SIP over TLS
for added security.
Configure SIP Over TLS Signaling Encryption
Procedure
Step 1
To enable TLS for the phone, in the phone web user interface, navigate to
Admin Login
>
advanced
>
Voice
>
Ext(n)
, where n is an extension number.
Step 2
In the
SIP Settings
section, select
TLS
from the
SIP Transport
drop-down list box.
Step 3
Click
Submit All Changes
.
Documentation, Support, and Security Guidelines
For information on obtaining documentation, obtaining support, providing documentation feedback, reviewing
security guidelines, and also recommended aliases and general Cisco documents, see the monthly
What
’
s New
in Cisco Product Documentation
, which also lists all new and revised Cisco technical documentation, at:
http://www.cisco.com/c/en/us/td/docs/general/whatsnew/whatsnew.html
Subscribe to the
What
’
s New in Cisco Product Documentation
as a Really Simple Syndication (RSS) feed
and set content to be delivered directly to your desktop using a reader application. The RSS feeds are a free
service and Cisco currently supports RSS Version 2.0.
Cisco Product Security Overview
This product contains cryptographic features and is subject to U.S. and local country laws that govern import,
export, transfer, and use. Delivery of Cisco cryptographic products does not imply third-party authority to
import, export, distribute, or use encryption. Importers, exporters, distributors, and users are responsible for
compliance with U.S. and local country laws. By using this product, you agree to comply with applicable
laws and regulations. If you are unable to comply with U.S. and local laws, return this product immediately.
Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide
124
Documentation, Support, and Security Guidelines
Summary of Contents for 8851
Page 23: ...P A R T I About the Cisco IP Phone Technical Details page 9 Cisco IP Phone Hardware page 21 ...
Page 24: ......
Page 36: ...Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide 20 USB Port Information ...
Page 48: ......
Page 98: ......
Page 136: ......
Page 168: ...Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide 152 XML Services ...
Page 204: ...Cisco IP Phone 8800 Series Multiplatform Phones Administration Guide 188 Capture Packets ...
Page 210: ......