Cisco SPA2102-AN - Single Port Router Administration Manual page 33

Introducing Cisco Small Business Analog Telephone Adapters
ATA Software Features
Cisco Small Business ATA Administration Guide
Feature
SIP Over TLS
Media Loopback
Description
SPA2102, SPA3102, and SPA8800 devices allow 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 of 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. SIP over TLS is configured in the SIP Transport
parameter configured in the Line tab(s). See
Field Reference," on page
SPA2102, SPA3102, and PAP2T devices allow service
providers to use media loopback to quantitatively and
qualitatively measure the voice quality experienced by the
end user. One device acts as the audio transmitter and
receiver while the other device acts as the audio mirror.
The audio mirror transmits the audio packets that it
receives back to the transmitter/receiver instead of
transmitting the data sampled on its local microphone (IP
phone) or attached analog telephone (ATA-type device).
Media loopback is configured in the User tab. See
Voice Field Reference," on page
"ATA Voice
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