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Configuring the Voice Settings
DECT Line 1 - DECT Line 10
Cisco SPA232D Administration Guide 168
4
Audio Configuration
NOTE A codec resource is considered as allocated if it has been included in the SDP
codec list of an active call, even though it eventually may not be the one chosen for
the connection. So, if the G.729a codec is enabled and included in the codec list,
that resource is tied up until the end of the call whether or not the call actually uses
G.729a. If the G729a resource is already allocated and since only one G.729a
resource is allowed per device, no other low-bit-rate codec may be allocated for
subsequent calls; the only choices are G711a and G711u. On the other hand, two
G.723.1/G.726 resources are available per device. Therefore it is important to
disable the use of G.729a in order to guarantee the support of two simultaneous
G.723/G.726 codec.
Field Description
Preferred Codec,
Second Preferred
Codec, Third
Preferred Codec
Up to three codecs to be used for all calls from this
handset, listed order of preference. The actual codec
used in a call still depends on the outcome of the codec
negotiation protocol. Select one of the following: G711u,
G711a, G726-32, G729a, or G722.
Default setting for Preferred Codec: G711u
Default setting for Second and Third Preferred Codec:
Unspecified
Use Pref Codec
Only
To use only the preferred codec for all calls, select yes.
(The call fails if the far end does not support this codec.)
Otherwise, select no.
Default setting: yes
Use Remote Pref
Codec
To use the preferred codec specified by the remote peer,
select yes. Otherwise, select no.
Default setting:
Codec Negotiation Specify the codecs for codec negotiation: Default or List
All.
Default setting: Default
Silence Supp
Enable
To enable silence suppression so that silent audio frames
are not transmitted, select yes. Otherwise, select no.
Default setting: no