Linksys SPA921 Cisco Small Business IP Phone SPA9X1 Administration Guide - Page 149

Use Pref Codec Only, FAX CED Detect Enable

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Ext Tab Chapter 5 Linksys IP Phone Field Reference 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 uses of the G.723/G.726 codecs. Field Preferred Codec Silence Supp Enable Use Pref Codec Only Echo Canc Enable Echo Canc Adapt Enable Echo Supp Enable G729a Enable G723 Enable G726-16 Enable G726-24 Enable G726-32 Enable G726-40 Enable FAX CED Detect Enable 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. Defaults to G711u. To enable silence suppression so that silent audio frames are not transmitted, select yes. Otherwise, select no. Defaults to 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. Defaults to no. Enable the use of the echo canceller. Defaults to yes. Enable the echo canceller to adapt. Defaults to yes. Enable the use of echo suppressor. If is "no," this parameter is ignored. Defaults to yes. To enable the use of the G.729a codec at 8 kbps, select yes. Otherwise, select no. Defaults to yes. To enable the use of the G.723a codec at 6.3 kbps, select yes. Otherwise, select no. Defaults to yes. To enable the use of the G.726 codec at 16 kbps, select yes. Otherwise, select no. Defaults to yes. To enable the use of the G.726 codec at 24 kbps, select yes. Otherwise, select no. Defaults to yes. To enable the use of the G.726 codec at 32 kbps, select yes. Otherwise, select no. Defaults to yes. To enable the use of the G.726 codec at 40 kbps, select yes. Otherwise, select no. Defaults to yes. To enable detection of the fax Caller-Entered Digits (CED) tone, select yes. Otherwise, select no. Defaults to yes. 5-44 Linksys IP Phone Administrator Guide Firmware Version 5.1

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5-44
Linksys IP Phone Administrator Guide
Firmware Version 5.1
Chapter 5
Linksys IP Phone Field Reference
Ext Tab
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 uses of the G.723/G.726 codecs.
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, G726-16,
G726-24, G726-32, G726-40, G729a, or G723.
Defaults to G711u.
Silence Supp Enable
To enable silence suppression so that silent audio frames are not transmitted, select yes. Oth-
erwise, select no.
Defaults to no.
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.
Defaults to no.
Echo Canc Enable
Enable the use of the echo canceller.
Defaults to yes.
Echo Canc Adapt Enable
Enable the echo canceller to adapt.
Defaults to yes.
Echo Supp Enable
Enable the use of echo suppressor. If <Echo Canc Enable> is “no,” this parameter is
ignored.
Defaults to yes.
G729a Enable
To enable the use of the G.729a codec at 8 kbps, select yes. Otherwise, select no.
Defaults to yes.
G723 Enable
To enable the use of the G.723a codec at 6.3 kbps, select yes. Otherwise, select no.
Defaults to yes.
G726-16 Enable
To enable the use of the G.726 codec at 16 kbps, select yes. Otherwise, select no.
Defaults to yes.
G726-24 Enable
To enable the use of the G.726 codec at 24 kbps, select yes. Otherwise, select no.
Defaults to yes.
G726-32 Enable
To enable the use of the G.726 codec at 32 kbps, select yes. Otherwise, select no.
Defaults to yes.
G726-40 Enable
To enable the use of the G.726 codec at 40 kbps, select yes. Otherwise, select no.
Defaults to yes.
FAX CED Detect Enable
To enable detection of the fax Caller-Entered Digits (CED) tone, select yes. Otherwise,
select no.
Defaults to yes.