Cisco SPA301 Administration Manual page 346

Cisco SPA IP Phone Field Reference
Ext Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
Parameter
Release Unused
Codec
DTMF Process AVT
Silence Supp Enable
DTMF Tx Method
Description
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.
Defaults to yes.
Select yes to process RTP DTMF events. Otherwise,
select no. If this parameter is set to no, the AVT
payload type is not included in outbound SDP.
Defaults to yes.
To enable silence suppression so that silent audio
frames are not transmitted, select yes. Otherwise,
select no.
Defaults to no.
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.
Defaults to Auto.
A
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