User`s guide

88 Dialogic
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1000 and 2000 Media Gateway Series User’s Guide
Parameter Reference
3.4.7 SRTP Group
The Secure Real-time Transport Protocol (RTP) subgroup includes the following parameters:
• SRTP Preference
• MKI on Transmit Stream
• Key Derivation Enable
• Key Derivation Rate
• Anti-replay Window Size Hint
• Cipher Mode
• Authentication Type
• Authentication Tag Length
• Unauthenticated SRTP Enable
• UnEncrypted SRTCP Enable
• UnEncrypted SRTP Enable
SRTP Preference
Description: Specifies whether the Media Gateway and server exchange voice packets as
encrypted or non-encrypted.
Allowed Values:
• RTP_Only = The Media Gateway uses only RTP. If the server only supports Secure RTP, then
the calls are rejected.
• SRTP_Only = The Media Gateway uses only Secure RTP. If the server does not support Secure
RTP, then the calls are rejected.
• SRTP_Preferred = The Media Gateway attempts to connect using Secure RTP. If the server
supports Secure RTP, the call is connected using Secure RTP. If the server does not support
Secure RTP, then the call is connected using RTP.
Note: SRTP_Preferred is not supported in Version 5.1 SU2 Software.
Default Value = RTP_Only
INI File Parameter Name = srtpPreference
Note: Unit requires a restart if this parameter value is changed.