Linksys SPA9000 Administration Manual page 197

FAX Passthru Method
DTMF Tx Method
DTMF Detection Mode
FAX Process NSE
Hook Flash Tx Method
FAX Disable ECAN
Release Unused Codec
FAX Enable T38
FAX Tone Detect Mode
FAX T38 Redundancy
FAX Tone Detect Mode:
Linksys Voice System Administration Guide
Select the fax passthrough method: None, NSE, or ReINVITE.
Default: 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 AVT events. INFO uses the SIP INFO
method. Auto uses InBand or AVT based on the outcome of codec
negotiation.
Default: Auto
Determines where to use Normal or Strict DTMF detection
Strict mode reduces the likelihood of false DTMF detection but requires
an extra hold time after detection. Also the DTMF level is raised. Under
strict mode, the minimum duration threshold is 60 and 90 ms for AVT
and SIP-INFO respectively. The level threshold is -20 dBm.
Default: Strict
To use the fax process NSE feature, select yes. Otherwise, select no.
Default: 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: None
If enabled, this feature automatically disables the echo canceller when a
fax tone is detected. To use this feature, select yes. Otherwise, select no.
Default: no
This feature allows the release of codecs not used after codec
negotiation on the first call, so that other codecs can be used for the
second line. To use this feature, select yes. Otherwise, select no.
Default: yes
To enable the use of the ITU-T T.38 standard for faxing, select yes.
Otherwise, select no.
Default: yes
This parameter has three possible values:
caller or callee - SPA will detect FAX tone whether it is callee or caller
caller only - SPA will detect FAX tone only if it is the caller
callee only - SPA will detect FAX tone only if it is the callee
Default: caller or callee
The redundancy factor for the T.38 Fax Relay from 0 (none) to 4
Default: 1
The method of fax tone dection: caller and callee, caller only, or callee
only
Default: caller or callee
NOTE: This setting allows a fax tone to be detected from either side of
the call.
Voice tab
195