DRAFT
© 2003 - 2005 Linksys, a Division of Cisco Systems Proprietary (See Copyright Notice on Page 2)
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24, G726-32, G726-40, G729a, G723
Use Pref Codec Only Only use the preferred codec for all calls. The call will fail if
the far end does not support this codec.
Bool No
Silence Supp Enable Enable silence suppression so that silent audio frames are
not transmitted
Bool No
G729a Enable
1
Enable the use of G729a codec at 8 kbps. Bool Yes
G723 Enable
1
Enable the use of G723 codec at 6.3 kbps Bool Yes
G726-16 Enable
1
Enable the use of G726 codec at 16 kbps Bool Yes
G726-24 Enable
1
Enable the use of G726 codec at 24 kbps Bool Yes
G726-32 Enable
1
Enable the use of G726 codec at 32 kbps Bool Yes
G726-40 Enable
1
Enable the use of G726 codec at 40 kbps Bool Yes
DTMF Tx Method Method to transmit DTMF signals to the far end: Inband =
Send DTMF using the audio path; INFO = Use the SIP
INFO method, AVT = Send DTMF as AVT events; Auto =
Use Inband or AVT or INFO based on outcome of codec
negotiation
{InBand,
AVT,
INFO
Auto}
Auto
DTMF Process AVT If set to yes, SPA will include AVT payload type in its SDP
and will process AVT (DTMF) packets sent by the peer.
Else, it will not include AVT payload type in the SDP.
Bool Yes
Release Unused Codec If set to yes, SPA will relinquish all the low bit rate codecs
included in the original SDP that are not supported by the
called party; hence other concurrent calls can reuse these
low bit rate codecs (such as g729a). Otherwise, the SPA
will not relinquish these resources until the end of the call
even if the called party did not indicate support for these
codecs
Bool Yes
Notes:
1. 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 SPA, 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 SPA.
Therefore it is important to disable the use of G.729a in order to guarantee the support of 2 simultaneous
G.723/G.726 codec.
Dial Plan
Parameter Name Description Type Default
DIAL PLAN
Per-line dial plan script DialPlanScript See below
ENABLE IP DIALING
Enable IP Dialing Bool no
See the previous section for explanation of Dial Plan Script syntax.
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