SRTP is used to encrypt and secure the speech path to and from the phone. You must configure the following parameters on the phones.
Note:
You must configure equivalent parameters in Communication Manager or System Manager.
Parameter Name
Type
Default Value
Description
ENFORCE_SIPS_URI
Numeric
1
Specifies if a SIPS URI must be used for SRTP.
The valid options are the following:
0: Not enforced
1: Enforced (Default)
SDPCAPNEG
Numeric
1
Specifies if SDP capability negotiation is enabled.
The valid options are the following:
0: SDP capability negotiation is disabled.
1: SDP capability negotiation is enabled. (Default)
MEDIAENCRYPTION
String
9
Specifies which media encryption (SRTP) options are supported.3 options can be specified in a comma-separated list. These defined options must match those specified in Avaya Aura®Communication Manager IP-codec-set form.
The valid options are the following:
1: aescm128-hmac80
2: aescm128-hmac32
3: aescm128-hmac80-unauth
4:aescm128-hmac32-unauth
5: aescm128-hmac80-unenc
6: aescm128-hmac32-unenc
7: aescm128-hmac80-unenc-unauth
8: aescm128-hmac32-unenc-unauth
9: none (Default)
10: aescm256-hmac80
11: aescm256-hmac32
The list of media encryption options is ordered from high (left) to the low (right) options. The phone publishes this list in the SDP-OFFER or chooses from SDP-OFFER list according to the list order defined by MEDIAENCRYPTION. Avaya Aura® Communication Manager (CM) has the capability to change the list order in the SDP-OFFER (for audio only) when it passes through CM.
