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ASA Phone-Proxy RTP problem with external IP Phone

Hi,

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:203.20.33.52

IPC Internal IP behind DSL Router:172.31.254.4

Internal IP Phone:192.168.185.36

Media-session: 203.20.33.52/26700 :: client ip 192.168.185.36/16850

  Lcl RTP conn 203.20.33.52/26700 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

Please help me to resolve this problem

Regards

Uday

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