ATA Voice Field Reference
Line page
Cisco Small Business ATA Administration Guide 169
B
Audio Configuration section
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 G.729a 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.
Secure Call Serv
Enable Secure Call Service.
The default is yes.
Referral Serv
Enable Referral Service. See the
parameter for more details.
The default is yes.
Feature Dial Serv
Enable Feature Dial Service. See the
parameter for more details.
The default is yes.
Service
Announcement
Serv
Enable Service Announcement Service.
The default is yes.
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,
G726-16, G726-24, G726-32, G726-40, G729a, or
G723.
The default is G711u.
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