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Configuring the Voice Settings
PSTN (LINE Port)
Cisco SPA232D Administration Guide 134
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.
Password Password for this line.
Use Auth ID To use the authentication ID and password for SIP
authentication, select yes. Otherwise, select no to use the
user ID and password.
Default setting: no
Auth ID The Authentication ID for SIP authentication.
Field Description
Field Description
Preferred Codec Preferred codec for all calls. (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, or G729a.
Default setting: G711u
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
G729a Enable To enable the use of the G729a codec at 8 kbps, select
yes. Otherwise, select no.
Default setting: no