SRTP Parameters

As per RFC 3711, you cannot turn off authentication of RTCP.

The next table lists SRTP parameters.

Table 1. SRTP Parameters

Template

Parameter

Permitted Values

Change Causes

Restart or Reboot

sip-interop.cfg

sec.srtp.answerWithNewKey

1 (default) - Provides a new key when answering a call.

0 - Does not provide a new key when answering the call.

No

sip-interop.cfg

sec.srtp.key.lifetime

Specifies the lifetime of the key used for the cryptographic parameter in SDP.

Null (default) -

0 - The master key lifetime is not set.

Positive integer minimum 1024 or power of 2 notation - The master key lifetime is set.

Setting this parameter to a non-zero value may affect the performance of the phone.

Yes

sip-interop.cfg

sec.srtp.mki.enabled

0 (default) - The phone sends two encrypted attributes in the SDP, one with MKI and one without MKI when the base profile is set as Generic.

1 - The phone sends only one encrypted value without MKI when the base profile is set as Skype.

Yes

sip-interop.cfg

sec.srtp.mki.startSessionAtOne

0 (default) - The phone uses MKI value of 1.

1 - The MKI value increments for each new crypto key.

No

sip-interop.cfg

sec.srtp.padRtpToFourByteAlignment

0 (default) - The RTP packet padding is not required when sending or receiving video.

1 - The RTP packet padding is required when sending or receiving video.

Yes

sip-interop.cfg

sec.srtp.simplifiedBestEffort

1 (default) - The SRTP is supported with Microsoft Description Protocol Version 2.0 Extensions.

0 - The SRTP is not supported with Microsoft Description Protocol Version 2.0 Extensions.

No