Specifications

Administrator's Manual 29. Secure Real-time Transport Protocol
29 Secure Real-time Transport Protocol
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. Therefore, when using this feature you also need to use SIP over
TLS.
SRTP can be configured using the Web or Configuration File, as described below.
 To configure SRTP:
 Using the Web:
1. Access the ‘Media Streaming’ page (Configuration tab > Voice Over IP menu >
Media Streaming).
Figure 29-1: Enabling SRTP Web Fields
2. Configure the SRTP settings according to the parameters in the table below, and
then click Submit.
 Using the Configuration File:
Table 29-1: 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]
ARIA
[voip/media/srtp/aria_support_enabled]
Adds the ARIA encryption method to the list of
supported encryption the phone publishes.
 [0] Disable (default)
 [1] Enable
Defines the Master Key Index from SDP.
/voip/media/srtp/use_MKI
Defines the Maximum length of the Master Key Index.
/voip/media/srtp/MKI_length
Version 2.0.0 191 October 2012