Secure Real-Time Transport Protocol(SRTP) Encrypted Algorithm
Last modified date: 2017/01/09 views: 67
Description

Secure Real-Time Transport Protocol (SRTP) encrypts the RTP during VoIP phone calls to avoid interception and eavesdropping. The parties participating in the call must enable SRTP feature simultaneously. When this feature is enabled on both phones, the type of encryption to utilize for the session is negotiated between the IP phones. This negotiation process is compliant with RFC 4568.


Resolution

The RTP streams may be encrypted using an AES(Advanced Encryption Standard) algorithm.

Yealink IP Phone support below three AES algorithms

AES algorithm

AES_CM_128_HMAC_SHA1_80

AES_CM_128_HMAC_SHA1_32

F8_128_HMAC_SHA1_80

 

The table below provides an overview of the crypto-suites and their parameters:

                              AES algorithm

crypto-suites

AES_CM_128_HMAC_SHA1_80

AES_CM_128_HMAC_SHA1_32

F8_128_HMAC_SHA1_80

Master key length

128 bits

128 bits

128 bits

Master salt length

112 bits

112 bits

112 bits

SRTP lifetime

2^48   packets

2^48   packets

2^48   packets

SRTCP lifetime

2^31   packets

2^31   packets

2^31   packets

Cipher

AES Counter Mode

AES Counter Mode

AES F8 Mode

Encryption   key

128   bits

128 bits

128   bits

MAC

HMAC-SHA1

HMAC-SHA1

HMAC-SHA1

SRTP auth. Tag

80 bits

32 bits

80 bits

SRTCP auth. Tag

80 bits

80 bits

80 bits

SRTP auth. Key len.

160 bits

160 bits

160 bits

SRTCP auth. Key len.

160 bits

160 bits

160 bits

NOTE: If you enable SRTP, then you should also enable TLS. This ensures   the security of SRTP encryption.


More Information

Refer to RFC4568: http://www.ietf.org/rfc/rfc4568.txt?number=4568

Any further support, please feel free to contact support@yealink.com


Product Type
CP860 , SIP VP-T49G , SIP-T48S , SIP-T48G , SIP-T46S , SIP-T46G , SIP-T42S , SIP-T42G , SIP-T41S , SIP-T41P , SIP-T40P , SIP-T29G , SIP-T27G , SIP-T27P , T4S , SIP-T23G , SIP-T23P , SIP-T21P E2 , SIP-T19P E2 , SFB-T40P , SFB-T46G , SFB-T42G , SFB-T41P , SFB-T48G , T48G Skype for Business , T46G Skype for Business , T42G Skype for Business , T41P Skype for Business , T40P Skype for Business , VP530 , SIP-T38G , SIP-T32G , SIP-T28P , SIP-T26P , SIP-T22P , SIP-T21P , SIP-T20P , SIP-T19P , IP Phone Expansion Module EXP38 , LCD Expansion Module EXP39
Version
Suggest to use V81
200/200
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