Configuring Voice
Configuring Voice Settings
Cisco SPA100 Series Phone Adapters Administration Guide 107
4
DTMF Tx Strict Hold
Off Time
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: 40 ms
FAX Enable T38 To enable the use of ITU-T T.38 standard for FAX
Relay, select yes. Otherwise select no. Default
setting: Yes
Hook Flash Tx Method 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
FAX T38 Redundancy Select the appropriate number to indicate the number
of previous packet payloads to repeat with each
packet. Choose 0 for no payload redundancy. The
higher the number, the larger the packet size and the
more bandwidth consumed. Default setting: 1
FAX T38 ECM Enable Select yes to enable T.38 Error Correction Mode.
Otherwise select no.
FAX Tone Detect Mode This parameter has three possible values:
• caller or callee: The ATA will detect FAX tone
whether it is callee or caller
• caller only: The ATA will detect FAX tone only
if it is the caller
• callee only: The ATA will detect FAX tone only
if it is the callee Default setting: caller or callee.
Field Description
