Aastra Telecom 675xi Series User Manual

6

RN-001029-03, Release 2.4.1, Rev 01 

IP Phone Release Notes 2.4.1

Release 2.4.1 includes support for additional code types. Previously, using the Aastra Web UI or 

the configuration files, an Administrator could enable or disable basic codecs for the phones 

(G.711 u-law, G.711 a-law, and G.729), customize a codec preference list, and enable or disable 

silence suppression.

Now using the Aastra Web UI or the configuration files, an Administrator can select from up to 

14 codecs for the phones AND customize a codec preference list of up to 10 codecs. Silence 

suppression can still be enable or disabled as required.

Using the configuration files, you can enter the following parameters to configure the codecs for 

the phones and customize a codec preference list.
•

sip customized codec (this parameter has not changed but now supports up to 14 codecs)

Parameter –

(in Web UI)

Advanced Settings->Global SIP->RTP Settings

Configuration Files aastra.cfg, <mac>.cfg

Specifies a customized Codec preference list which allows you to 

select the preferred Codecs for this IP phone. You can enter up to 10 

codec preferences.

Note: Enabling or disabling silence suppression (sil supp) enables/

disables it for all codecs in the customized list.

Comma-separated list of semicolon-separated values

Not Applicable

Valid values for the syntax are:

payload 

0   - G711u/8000

8   - G711a/8000

98  - G726-16/8000

97  - G726-24/8000

115 - G726-32/8000

96  - G726-40/8000

18  - G729/8000

106 - BV16/8000

107 - BV32/16000

110 - G711u/16000

111 - G711a/16000

9   - G722/8000

113 - L16/16000

112 - L16/8000

ptime (in milliseconds)

5, 10, 15, 20........90

on, off

Note: The “silsupp” value is either ON for all codecs or OFF for all 

codecs.

sip customized codec: 

payload=18;ptime=10;silsupp=on,payload=0;ptime=10;

silsupp=on