Linksys Linksys SPA9000, Administration Manual

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Linksys Voice System Administration Guide 193
Voice tab
Voice tab > FXS 1/2 page
Audio Configuration section
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 codecs.
Conference Bridge URL This feature supports external conference bridging for n-way
conference calls (n > 2), instead of mixing audio locally. To use this
feature, set this parameter to that of the server's name; for example,
conf@myserver.com:12345 or conf (which uses the Proxy value as the
domain).
Default: blank
Conference Bridge Ports Maximum number of conference call participants. The range is 3 to 10.
Default: 3
Enable IP Dialing To use IP dialing, select yes. Otherwise, select no.
Default: no
Emergency Number Comma-separated list of emergency number patterns. If an outbound
call matches one of the patterns, the SPA9000 disables call waiting, hook
flash event handling, and fax tone detection. Operation is restored to
normal when the phone is on-hook again. If you leave this field blank,
the SPA9000 has no emergency number.
Mailbox ID Enter the ID number of the mailbox for this line.
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
Default: G711u
Second Preferred Codec,
Third Preferred Codec Other codecs to be preferred if the preferred codec is not available due
to the codec negotiation protocol.
Default: Unspecified
Use Pref Codec Only If set to yes, the call can be completed only with the preferred codec.
Default: no
Silence Supp Enable To enable silence suppression so that silent audio frames are not
transmitted, select yes. Otherwise, select no.
Default: no