Cisco SPA301 Administration Manual page 153

Configuring Security, Quality, and Network Features
Configuring Voice Codecs
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
To enable the release of codecs not used after codec
negotiation on the first call so that other codecs can be
used for the second line, select yes. Otherwise, select no.
Defaults to yes.
Processes RTP DTMF events. When yes DTMF is relayed
by using Named Telephony Events (NTEs) in Real-Time
Transport Protocol (RTP) packets (RFC-2833, RTP Payload
for DTMF Digits, Telephony Tones and Telephony Signals).
Defaults to yes.
To enable silence suppression so that silent audio frames
are not transmitted, select yes. Otherwise, select no.
Defaults to no.
The method for transmitting DTMF signals to the far end.
The options are: InBand, audio video transport (AVT), INFO,
Auto, InBand+INFO, or AVT+INFO.
• InBand sends DTMF by 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.
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