[cisco-voip] Third Party Softphone w/ TLS

[Johnson, Tim]

Does anyone have a working configuration of using a third party SIP softphone with TLS? I have it working with Cisco phones and Jabber, but am trying to get a third party client working. I'm on CUCM 12.0.

So far, I'm running into an issue with the TLS handshake. The client is using TLS 1.0, and I confirmed that my CUCM nodes do support 1.0. I've put the CallManager cert in the trusted root (local machine) on the Windows client. When attempting to register the client, CUCM gives an error "peer did not return a certificate." That led me to think that I would need to get a signed cert uploaded as a CM-trust cert. I opened a ticket with TAC to ask if that's the case (would rather not have to do a client cert if I don't need to) and they suggested I may not need one. I haven't been able to get more out of them on this yet (after a week), so I figured I'd ask here.

Tim Johnson
Voice & Video Engineer
Central Michigan University

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