Cisco SPA112 Administration Manual page 98

Configuring the Voice Settings
Line 1 and Line 2 Settings (PHONE Port1 and PHONE2)
Cisco SPA100Series Administration Guide
Field
DTMF Tx Mode
DTMF Tx Strict
Hold Off Time
FAX Enable T38
Hook Flash Tx
Method
Description
DTMF Detection Tx Mode is available for SIP information
and AVT. Options are: Strict or Normal.
Default setting: Strict for which the following are true:
• A DTMF digit requires an extra hold time after
detection.
• The DTMF level threshold is raised to -20 dBm.
The minimum and maximum duration thresholds are:
• strict mode for AVT: 70 ms
• normal mode for AVT: 40 ms
• strict mode for SIP info: 90 ms
• normal mode for SIP info: 50 ms
This parameter is in effect only when DTMF Tx Mode is set
to strict, and when DTMF Tx Method is set to out-ofband;
i.e. either AVT or SIP-INFO. The value can be set as low as
40 ms. There is no maximum limit. A larger value will
reduce the chance of talk-off (beeping) during
conversation, at the expense of reduced performance of
DTMF detection, which is needed for interactive voice
response systems (IVR) Default: 70 ms
To enable the use of ITU-T T.38 standard for FAX Relay,
select yes. Otherwise select no.
Default setting: yes
Select the method for signaling hook flash events: None,
AVT, or INFO. None does not signal hook flash events. AVT
uses RFC2833 AVT (event = 16) INFO uses SIP INFO with
the single line signal=hf in the message body. The MIME
type for this message body is taken from the Hook Flash
MIME Type setting.
Default setting: None
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