[cisco-voip] NATed SIP trunk direct to CM (no CUBE)

[Ted Nugent]

Any chance of getting this working without CUBE? This is a lab environment
to an external SIP provider
Outbound calls are working without a hitch but internal are getting 404
errors becuase the invite has my external IP.
These are NATed through an ASA with the information below. Any and all help
is appreciated!
CUCM 8.5

Provider PBX: 10.10.10.10
My external IP: 10.20.20.20 - ASA outside
CM Address: 192.168.2.225 - internal network
called# 9195551212 - assigned to an IP phone
Calling# 9194755555 - PSTN Number

SIP/2.0 404 Not Found
Via: SIP/2.0/UDP 10.10.10.10:5060;branch=z9hG4bK615f910f;rport
From: "9194755555" <sip:9194755555 at 10.10.10.10>;tag=as2bb2da19
To: <sip:9195551212 at 10.20.20.20
>;tag=32~d17116a5-4521-4eab-b0b1-1592b390b4a2-32411046
Date: Fri, 13 Jul 2012 00:29:16 GMT
Call-ID: 571cb73b62128c9b25faa9530644ae92 at 10.10.10.10
CSeq: 102 INVITE
Allow-Events: presence
Reason: Q.850;cause=1
Content-Length: 0

|1,100,230,1.68^10.10.10.10^*
20:29:16.485 |//SIP/SIPUdp/wait_UdpDataInd: Incoming SIP UDP message size
448 from 10.10.10.10:[5060]:
[130,NET]
ACK sip:9195551212 at 10.20.20.20 SIP/2.0
Via: SIP/2.0/UDP 10.10.10.10:5060;branch=z9hG4bK615f910f;rport
Max-Forwards: 70
From: "9194755555" <sip:9194755555 at 10.10.10.10>;tag=as2bb2da19
To: <sip:9195551212 at 10.20.20.20
>;tag=32~d17116a5-4521-4eab-b0b1-1592b390b4a2-32411046
Contact: <sip:9194755555 at 10.10.10.10>
Call-ID: 571cb73b62128c9b25faa9530644ae92 at 10.10.10.10
CSeq: 102 ACK
User-Agent: Asterisk PBX 1.6.2.13
Content-Length: 0
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