Audio Configuration - Cisco Small Business SPA509G Administration Manual

Cisco SPA IP Phone Field Reference
Ext Tab
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide
Parameter
Auth ID
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 uses of the G.723/G.726 codecs.
Parameter
Preferred Codec
Description
Authentication ID for SIP authentication.
Defaults to blank.
Base64 encoded of Mini-Certificate concatenated with
the 1024-bit public key of the CA signing the MC of all
subscribers in the group.
Defaults to blank.
Base64 encoded of the 512-bit private key per
subscriber for establishment of a secure call.
Defaults to blank.
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, G722, G726-16, G726-24, G726-32,
G726-40, G729a, or G723.
NOTE Cisco SPA525G/525G2 choices are: G711u,
G711a, G726-32, G729a, and G722. G.723 not available
on SPA300 Series or SPA500 Series. G722 not
available on WIP310.
Defaults to G711u.
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