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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