Cisco Small Business SPA2102 Administration Manual page 177

ATA Voice Field Reference
Line page
Cisco Small Business ATA Administration Guide
FAX Codec
Symmetric
DTMF Process
AVT
FAX Passthru
Method
DTMF Tx Method
DTMF Tx Mode
DTMF Tx Strict
Hold Off Time:
To force the ATA to use a symmetric codec during fax
passthrough, select yes. Otherwise, select no.
The default is yes.
To use the DTMF process AVT feature, select yes.
Otherwise, select no. This field is not available for the
PAP2T.
The default is yes.
Select the fax passthrough method: None, NSE, or
ReINVITE.
The default is NSE.
Select the method to transmit DTMF signals to the far end:
InBand, AVT, INFO, Auto, InBand+INFO, or AVT+INFO.
InBand sends DTMF using the audio path. AVT sends
DTMF as eypents. INFO uses the SIP INFO method. Auto
uses InBand or AVT based on the outcome of codec
negotiation.
The default is Auto.
DTMF Detection Tx Mode is available for SIP information
and AVT . Options are: Strict or Normal. The default is
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-of-
band; 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: 90 ms
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