System information

Getting Started
Feature Overview
Cisco SPA232D Administration Guide 13
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string, and a short timeout, signaling that more digits are expected. For more
information, see Configuring Dial Plans, page 213.
• Polarity Control
The ATA allows the polarity to be set when a call is connected and when a
call is disconnected. This feature is required to support some pay phone
system and answering machines. You can configure these settings in the
FXS Port Polarity Configuration section of the Line 1 Settings (PHONE
Port) page.
• Calling Party Control
Calling Party Control (CPC) signals to the called party equipment that the
calling party has hung up during a connected call by momentarily removing
the voltage between the tip and the ring. This feature is useful for
auto-answer equipment. You can configure these settings in the Control
Timer Values section of the Regional page.
• Event Logging
You can enable logging and select the relative priority of events to be
logged. The information can be sent to a Syslog Server. You can configure
the syslog and debug settings in the Miscellaneous Settings section of the
System page.
• SIP over TLS
The ATA allows the use of SIP over Transport Layer Security (TLS) SIP over
TLS is designed to eliminate the possibility of malicious activity by
encrypting the SIP messages between the service provider and the end
user. SIP over TLS relies on the widely-deployed and standardized TLS
protocol. SIP over TLS encrypts only the signaling messages and not the
media. A separate secure protocol such as Secure Real-Time Transport
Protocol (SRTP) can be used to encrypt voice packets. You can configure
the SIP Transport parameter in the SIP Settings section of these pages:
Line 1 Settings (PHONE Port), PSTN (LINE Port), and DECT Line 1 -
DECT Line 10.