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ATA Voice Field Reference
Line page
Cisco Small Business ATA Administration Guide
177
B
FAX Codec
Symmetric
To force the ATA to use a symmetric codec during fax
passthrough, select yes. Otherwise, select no.
The default is
yes
.
DTMF Process
AVT
To use the DTMF process AVT feature, select yes.
Otherwise, select no. This field is not available for the
PAP2T.
The default is
yes
.
FAX Passthru
Method
Select the fax passthrough method: None, NSE, or
ReINVITE.
The default is
NSE
.
DTMF Tx Method
Select the method to transmit DTMF signals to the far end:
InBand, AVT, INFO, Auto, 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 Tx Mode
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