Yealink SIP-T2 SERIES Administrator's Manual page 886

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Parameters
Phone User Interface:
None
account.17.srtp_encryption
Description:
Configures whether to use voice encryption service for IP call.
0-Disabled
1-Optional
2-Compulsory
If it is set to 1 (Optional), the IP phone will negotiate with the other IP phone what
type of encryption to utilize for the session.
If it is set to 2 (Compulsory), the IP phone is forced to use SRTP during a call.
Note: It is only applicable to SIP VP-T49G IP phones.
Web User Interface:
Account->SIP IP Call->RTP Encryption(SRTP)
Phone User Interface:
Menu->Advanced (default password: admin) ->VC Accounts->SIP IP Call->SRTP
To configure SRTP feature for account via web user interface (take SIP-T23G IP phones
for example):
1. Click on Account->Advanced.
2. Select the desired account from the pull-down list of Account.
864
Permitted Values
0, 1 or 2
Default
0