Operational, Basic, and Advanced Parameters
41-001343-02 REV04 – 05.2014 A-102
Parameter –
sip dtmf method
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description Sets the Dual-tone multifrequency (DTMF) method to use on the IP phone.
Note:
See “Out-of-Band DTMF and DTMF Method on page 4-79” for DTMF behavior informa-
tion when this parameter is used in conjunction with the “sip out-of-band dtmf”
parameter.
Format Boolean
Default Value 0 (RTP)
Range 0 (RTP)
1 (SIP INFO)
2 (BOTH)
Example sip dtmf method: 1
Parameter –
sip srtp mode
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description This parameter determines if SRTP is enabled on this IP phone, as follows:
• If set to 0, then disable SRTP.
• If set to 1 then SRTP calls are preferred.
• If set to 2, then SRTP calls only are generated/accepted.
Format Integer
Default Value 0 (SRTP Disabled)
Range 0 (SRTP Disabled)
1 (SRTP Preferred)
2 (SRTP Only)
Example sip srtp mode: 1
Parameter –
sip silence suppression
Configuration Files
aastra.cfg, <model>.cfg, <mac>.cfg
Description Silence suppression is enabled by default on the IP phones. The phone negotiates
whether or not to use silence suppression. Disabling this feature forces the phone to
ignore any negotiated value.
Format Boolean
Default Value 1 (enabled)
Range 0 (disabled)
1 (enabled)
Example sip silence suppression: 0