ASA Phone-Proxy RTP problem with external IP Phone
With ASA Phone Proxy setup when my laptop connected with public IP to internet IP Communicator installed on my laptop successfully register with Cisco Unified communication Manager located in my company and audio calls also working perfectly but problem here is when my laptop got private IP from wireless DSL Router that time IPC successfully register with CUCM and I am able to calls other Phone and also hear ring but when call connected both party not able to here audio.
Show output of ASA phone proxy show that it is trying to establish RTP with IPC physical IP address not with nated IP address.
Internal MTP IP :192.168.175.71
External MTP IP:18.104.22.168
IPC Internal IP behind DSL Router:172.31.254.4
Internal IP Phone:192.168.185.36
Media-session: 22.214.171.124/26700 :: client ip 192.168.185.36/16850
Lcl RTP conn 126.96.36.199/26700 to 172.31.254.4/24578 tx_pkts 444 rx_pkts 0
Media-session: 192.168.175.71/25476 :: client ip 172.31.254.4/24578
Lcl RTP conn 192.168.175.71/25476 to 192.168.185.36/16850 tx_pkts 0 rx_pkts 444
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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 ...