IP phone(C7960, DN:2001) calls are no problem in the local site with CCM 3.1.3a, but a IP Phones(3001) in the remote site connected via the VPN calls the 2001, the 2001 can hear the connection tone but the call will be droped when pick up the phone. Even both phone are both in the remote site.
I checked the CCM Evenviewer and indicated some phone unregistered errors. I know the issue is the phone can't keep the TCP connection with the CCM and maybe the network issue.
Because the connection tone can be got, so the SIP call setup packects can be passed the VPN, looks like the RTP voice stream triggered the TCP connection drop when pickup the phone, but why?
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The short answer is that you don't.... That isn't entirely true while at
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Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...