Aastra Telecom SISIP 57I CT - Manual (Page 128)

Advanced Network Settings
4-62 41-001160-00, Rev 01 Release 2.0
IP Phone Administrator Guide
Configuring the IP Phones
5 Enter a "Customized Codec Preference List" which all
payload=8;ptime=10;
silsupp=on;
payload=0;ptime=10;
silsupp=off
Valid values are:
6 ISelect a method to use from the DTMF Method list box. Valid values are RTP, SIP Info, Both.
Note: You can also configure the DTMF Method on a per-line basis at Advanced Settings->
Line N (1-9).
7 Silence suppression is enabled by default. If required, disable the "Silence Suppression" field by
unchecking the check box.
8 Click to save your changes.
9 Select Operation->Reset and click ..
Aastra Web UI
Step Action
Attribute Value
payload 0 for G.711 u-Law
8 for G.711 a-Law
18 for G.729a
ptime (in milliseconds) 5, 10, 15, 20.....90
silsupp on
off