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Chapter 5
SPA900 Series Phone Field Reference
Use Auth ID
Auth ID
Cfwd No Ans Delay
Mini Certificate
SRTP Private Key
Audio Configuration
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.
Field
Preferred Codec
Silence Supp Enable
Use Pref Codec Only
Document Version 3.0
To use the authentication ID and password for SIP authentication, select yes.
Otherwise, select no to use the user ID and password.
The default is no.
Authentication ID for SIP authentication.
Delay, in seconds, before the call forwarding of no-answer calls feature is
triggered.
The default is 20.
Base64 encoded of Mini-Certificate concatenated with the 1024-bit public key of
the CA signing the MC of all subscribers in the group.
The default is empty.
Base64 encoded of the 512-bit private key per subscriber for establishment of a
secure call.
The default is empty.
Description
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.
To enable silence suppression so that silent audio frames are not transmitted,
select yes. Otherwise, select no.
The default is no.
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.
The default is no.
Linksys 900 Series IP Phone Administrator Guide
Ext 1/2/3/4/5/6 Tab
5-45
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