Cisco Cisco IOS Software Release 12.4(6)T

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SIP: Cisco IOS SIP Gateway Signaling Support Over TLS Transport
  Feature Information for SIP: Cisco IOS SIP Gateway Signaling Support Over TLS Transport
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Cisco IOS Release 12.4(6)T
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Table 2
Feature Information for <Phrase Based on Module Title>
Feature Name
Releases
Feature Information
SIP: Cisco IOS SIP Gateway Signaling Support 
Over TLS Transport
12.4(6)T
This feature module describes the SIP: Cisco IOS 
SIP Gateway Signaling Support Over TLS Transport 
feature which implements the Transport Layer Security 
(TLS) protocol on the Transmission Control Protocol (TCP) 
transport for Cisco IOS SIP gateways. The feature leverages 
the existing SIP gateway’s support of the public-key 
infrastructure (PKI) (for certificate management) and 
utilizes TLS functionality to provide SIP signaling over 
TLS transport. The use of PKI on the Cisco IOS software 
requires that the clock on the session initiation protocol 
(SIP) gateway be synchronized with the network time to 
ensure proper validation of certificates.
The following sections provide information about this 
feature:
The following commands were introduced or modified by 
this feature:
, and 
.