Version 6.2 359 February 2011
SIP User's Manual 10. Configuration Parameters Reference
Parameter Description
Web/EMS: Media Security
Behavior
[MediaSecurityBehaviour]
Determines the device's mode of operation when SRTP is used
(i.e., when the parameter EnableMediaSecurity is set to 1).
[0] Preferable = The device initiates encrypted calls. If
negotiation of the cipher suite fails, an unencrypted call is
established. Incoming calls that don't include encryption
information are accepted. (default)
[1] Mandatory = The device initiates encrypted calls, but if
negotiation of the cipher suite fails, the call is terminated.
Incoming calls that don't include encryption information are
rejected.
[2] Disable = The profile does not support encrypted calls (i.e.,
SRTP).
[3] Preferable - Single Media = The device sends SDP with a
single media ('m=') line only (e.g., m=audio 6000 RTP/AVP 4 0
70 96) with RTP/AVP and crypto keys. If the remote SIP UA
does not support SRTP, it ignores the crypto lines.
Notes:
Before configuring this parameter, set the EnableMediaSecurity
parameter to 1.
This parameter can also be configured per IP Profile, using the
IPProfile parameter (see ''Configuring IP Profiles'' on page 122).
Web: Master Key Identifier
(MKI) Size
EMS: Packet MKI Size
[SRTPTxPacketMKISize]
Determines the size (in bytes) of the Master Key Identifier (MKI) in
SRTP Tx packets.
The range is 0 to 4. The default value is 0.
Web/EMS: SRTP offered Suites
[SRTPofferedSuites]
Defines the offered crypto suites (cipher encryption algorithms) for
SRTP.
[0] All = All available crypto suites (default)
[1] AES_CM_128_HMAC_SHA1_80 = device uses AES-CM
encryption with a 128-bit key and HMAC-SHA1 message
authentication with a 80-bit tag.
[2] AES_CM_128_HMAC_SHA1_32 = device uses AES-CM
encryption with a 128-bit key and HMAC-SHA1 message
authentication with a 32-bit tag.
Web: Disable Authentication On
Transmitted RTP Packets
EMS: RTP
AuthenticationDisable Tx
[RTPAuthenticationDisableTx]
On a secured RTP session, this parameter determines whether to
enable authentication on transmitted RTP packets.
[0] Enable (default)
[1] Disable
Web: Disable Encryption On
Transmitted RTP Packets
EMS: RTP EncryptionDisable
Tx
[RTPEncryptionDisableTx]
On a secured RTP session, this parameter determines whether to
enable encryption on transmitted RTP packets.
[0] Enable (default)
[1] Disable
Web: Disable Encryption On
Transmitted RTCP Packets
EMS: RTCP EncryptionDisable
Tx
[RTCPEncryptionDisableTx]
On a secured RTP session, this parameter determines whether to
enable encryption on transmitted RTCP packets.
[0] Enable (default)
[1] Disable
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