Cisco SPA112 Administration Guide - Page 39

Echo Cancellation, Hook Flash Events, Hook Flash Timer, Configurable Dial Plan with Interdigit Timers

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Configuring Voice Getting Started with Voice Services 4 • Echo Cancellation Impedance mismatch between the telephone and the IP Telephony gateway phone port can lead to near-end echo. The ATA has a near-end echo canceller that compensates for impedance mismatch. The ATA also implements an echo suppressor with Comfort Noise Generator (CNG) so that any residual echo is not noticeable. These features are enabled by default. For more information, see the Audio Configuration section in Line 1 and Line 2 Settings (PHONE1 and PHONE2), page 90. • Hook Flash Events The ATA can signal hook flash events to the proxy during a connected call. This feature can be used to provide advanced mid-call services with thirdparty-call control. You may need to adjust the settings described below. - Depending on the features that the service provider offers using thirdparty-call-control, you may need to disable Call Waiting Service, Three Way Conference Service, or Three Way Call Service to correctly signal a hook flash event to the softswitch. For more information, see the Supplementary Service Subscription section in Line 1 and Line 2 Settings (PHONE1 and PHONE2), page 90. - You can configure the length of time allowed for detection of a hook flash by using the Hook Flash Timer parameter on the Regional page, Control Timer Values section. See Voice System Regional Settings, page 73. • Configurable Dial Plan with Interdigit Timers The ATA has three configurable interdigit timers: an initial timeout signaling that a phone is taken off hook, a long timeout signaling the end of a dialed string, and a short timeout, signaling that more digits are expected. For more information, see Configuring Dial Plans, page 42. • 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. For more information, see the FXS Port Polarity Configuration section in Line 1 and Line 2 Settings (PHONE1 and PHONE2), page 90. • 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. For more information, see the Control Timer Values section in Voice System Regional Settings, page 73. Cisco SPA100 Series Phone Adapters Administration Guide 39

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Configuring Voice
Getting Started with Voice Services
Cisco SPA100 Series Phone Adapters Administration Guide
39
4
•
Echo Cancellation
Impedance mismatch between the telephone and the IP Telephony
gateway phone port can lead to near-end echo. The ATA has a near-end
echo canceller that compensates for impedance mismatch. The ATA also
implements an echo suppressor with Comfort Noise Generator (CNG) so
that any residual echo is not noticeable. These features are enabled by
default. For more information, see the
Audio Configuration
section in
Line 1
and Line 2 Settings (PHONE1 and PHONE2), page 90
.
•
Hook Flash Events
The ATA can signal hook flash events to the proxy during a connected call.
This feature can be used to provide advanced mid-call services with third-
party-call control. You may need to adjust the settings described below.
-
Depending on the features that the service provider offers using third-
party-call-control, you may need to disable Call Waiting Service, Three
Way Conference Service, or Three Way Call Service to correctly signal a
hook flash event to the softswitch. For more information, see the
Supplementary Service Subscription
section in
Line 1 and Line 2
Settings (PHONE1 and PHONE2), page 90
.
-
You can configure the length of time allowed for detection of a hook flash
by using the
Hook Flash Timer
parameter on the
Regional
page,
Control Timer Values
section. See
Voice System Regional Settings,
page 73
.
•
Configurable Dial Plan with Interdigit Timers
The ATA has three configurable interdigit timers: an initial timeout signaling
that a phone is taken off hook, a long timeout signaling the end of a dialed
string, and a short timeout, signaling that more digits are expected. For more
information, see
Configuring Dial Plans, page 42
.
•
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. For more information, see the
FXS Port
Polarity Configuration
section in
Line 1 and Line 2 Settings (PHONE1 and
PHONE2), page 90
.
•
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. For more information, see the
Control Timer Values
section in
Voice System Regional Settings, page 73
.