AudioCodes 420HD - 33 Configuring SRTP; Figure 33-1: Web Interface - SRTP

Administrator's Manual 33.Configuring SRTP
Version 2.2.8 217 400HD Series IP Phones
33 Configuring SRTP
Secure Real-time Transport Protocol (SRTP) is a protocol that allows encryption for RTP
data. Since the RTP encryption key is delivered via SIP, this feature is relevant only when
SIP transport is secured, so when using this feature you also need to use SIP over TLS.
SRTP can be configured using the Web interface or configuration file.
 To configure SRTP using the Web interface:
1. Access the Media Streaming page (Configuration tab > Voice Over IP menu > Media
Streaming).
Figure 33-1: Web Interface - SRTP
2. Configure the SRTP settings according to the parameters in the table below, and then
click Submit.
 To configure SRTP using the configuration file:
• Use the table below as reference.
Table 33-1: SRTP Parameters
Parameter Description
Enable SRTP Encryption and
Authentication
[voip/media/srtp/enabled]
Enables secured RTP (SRTP).
 [0] Disable (default)
 [1] Enable
Method
[voip/media/srtp/method]
The SRTP encryption method.
 [AES_CM_128_HMAC_SHA1_32] (default)
 [AES_CM_128_HMAC_SHA1_80]
 [AES_CM_128_ALL_METHODS]
/voip/media/srtp/use_MKI
Defines the Master Key Index from SDP.
/voip/media/srtp/MKI_length
Defines the maximum length of the Master Key Index.
Range: 1 - 4. Default: 1.