How to configure SRTP/TLS in a GXP 1620 Telephone IP?
[GXP16XX series small-medium business IP phone]
(4)
Firmware 1.0.19.4 for DP752/750/760/730/722/720 released as official
[DP75x/DP730/DP72x/DP760 Cordless Phones]
(2)
Firmware 1.0.3.3 for GSC3510/GSC3505 released as official
[GSC3505/3510 SIP Intercom Speaker / Microphone]
(2)