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Global SIP Settings
41-001160-00, Release 2.1, Rev 04 4-73
Configuring Network and Session Initiation Protocol (SIP) Features
Configuring the IP Phones
5 Enter a "Customized Codec Preference List". For example,
payload=8;ptime=10;
silsupp=on;
payload=0;ptime=10;
silsupp=off
Valid values are:
For this parameter, you specify a customized codec list which allows you to use the preferred Codecs
for this IP phone. Default for the “Customized Codec Preference List” is blank.
6 Select a method to use from the “DTMF Method” list box. Valid values are RTP, SIP Info, Both.
Default is RTP.
Note: You can configure the DTMF Method on a global or per-line basis.
7 Select the type of RTP encryption to use from the “RTP Encryption” list box. Valid values are SRTP
Disabled, SRTP Preferred, or SRTP Only. Default is SRTP Disabled.
Note: You can configure RTP Encryption on a global or per-line basis.
8The “Silence Suppression” field is enabled by default. Disable this field by unchecking the check
box.
When enabled, the phone negotiates whether or not to use silence suppression. Disabling this
feature forces the phone to ignore any negotiated value.
9 Click to save your changes.
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