Cannot register phone pass NAT on ASA

[s.sitthichai]

I have installed cisco equipment to customers and would like register IP-Phone to Callmanager from outside.

Home  --------  Internet  -----------  ASA  --------  Callmanager

            - I have public IP Address for CallManger.

            - I have static NAT from inside to outside and add policy rule any for it.

            - I have Application Layer Gateway capability.

From outside can PING and WebUI to Callmanager.

            - IP Phone fix TFTP Server (Public IP).

I’m not sure, Do NAT won't work with CUCM ?

Thank you very much.

[s.sitthichai]

I have default inspetion on cisco ASA.

class-map inspection_default

match default-inspection-traffic

!

!

policy-map global_policy

class inspection_default

  inspect dns preset_dns_map

  inspect ftp

  inspect h323 h225

  inspect h323 ras

  inspect netbios

  inspect rsh

  inspect rtsp

  inspect skinny 

  inspect esmtp

  inspect sqlnet

  inspect sunrpc

  inspect tftp

  inspect sip 

  inspect xdmcp

!

service-policy global_policy global

[s.sitthichai]

Do you think I should do to solve the problem ?  Thank you.