in Cisco documentation I found that secure sip trunk (authentication and/or encryption) is possible e.g. with an voicemail system (like Cycos/MRS-Server)
Has anyone already configured this feature ? please, could anyone provide a short HowTo or explain how to configure in both sides
In documentation I read srtp over secure cisco-sip trunk (CUCM 6.1) is not supported ...
But I dont understand reason:
because if we use alreday TLS for signaling why is "srtp over sip" not possible ?
Is this problem of Cisco sip protocol implementation ?