Aastra VentureIP 480i, Руководство администратора

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26 IP Phone SIP Admin Guide
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Configuring RTP
From the IP phone:
1 Press
w
on the phone to
enter the Options List.
2 Select SIP Settings.
3 Select RTP Port Base to change
the RTP port base setting.
Default is 3000.
4 Press Done to save the RTP Port
Base setting.
From the Aastra Web UI:
1 Click on Advanced
Settings->Global SIP.
2 Enter an RTP Port Base in the
RTP Port field. Default is 3000.
3 Enable the "Basic Codecs (G.711
u-Law, G.711 a-Law, G.729)"
field by checking the check box.
(Disable this field by uncheck-
ing the box). Enabling this
parameter allows the IP phone
to use the basic Codecs when
sending/receiving RTP packets.
4 Enable the "Force RFC2833 Out-
of-Band DTMF" field by check-
ing the check box. (Disable this
field by unchecking the box).
Enabling this parameter forces
the IP phone to use out-of-band
DTMF according to RFC2833.
5 Enter a customized Codec
preference list which allows you
to use the preferred Codecs for
this IP phone.
For example, enter the following
on one line:
payload=8;ptime=10;
silsupp=on;
payload=0;ptime=10;
silsupp=off
.
Valid values are:
6 Click to save your
changes.
Attribute Value
payload 0 for G.711 u-Law
8 for G.711 a-Law
18 for G.729a
ptime
(in millisec-
onds) 10
20
30
silsupp on
off