[cisco-voip] Unable to register CME with VOIP Carrier

[Gregory Wong]

I have the following topology:

Internet ‹ 2651 ‹ Switch ‹ 2651XM

The 2651 is acting as a gateway running NAT for my Comcast internet line.
The 2651XM is running CME. I am trying to establish connectivity with my
Voip carrier but they are claiming that 1) You are sending a phone number as
your username and 2) You are sending an internal IP in the Via header which
is why the registration is failing.

How can I  configure CME to send the username and not the phone number for
the registration along with setting the IP public IP address (which is the
IP on f0/0 on the 2651) on the Via header?

Below is a debug of the REGISTER and Received messages along with my sip-ua
configuration.

Jan 23 03:37:24.207: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
Sent: 
REGISTER sip:carriers.icall.net:5060 SIP/2.0
Via: SIP/2.0/UDP 192.168.15.5:5060;branch=z9hG4bK6744A
From: <sip:16174461220 at carriers.icall.net>;tag=1190E67-B05
To: <sip:16174461220 at carriers.icall.net>
Date: Wed, 23 Jan 2008 03:37:24 GMT
Call-ID: 81A69C86-C89A11DC-80D7880D-52652CB2
User-Agent: Cisco-SIPGateway/IOS-12.x
Max-Forwards: 70
Timestamp: 1201059444
CSeq: 4 REGISTER
Contact: <sip:16174461220 at 192.168.15.5:5060>
Expires:  3600
Content-Length: 0

Jan 23 03:37:24.291: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
Received: 
SIP/2.0 404 Not found
Via: SIP/2.0/UDP 192.168.15.5:5060;branch=z9hG4bK6744A;received=192.168.15.5
From: <sip:16174461220 at carriers.icall.net>;tag=1190E67-B05
To: <sip:16174461220 at carriers.icall.net>;tag=as56529005
Call-ID: 81A69C86-C89A11DC-80D7880D-52652CB2
CSeq: 4 REGISTER
User-Agent: iCall MGW
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
Content-Length: 0

sip-ua 
 authentication username cust_gwong86 password 7 <password>
 no remote-party-id
 retry invite 4
 retry response 3
 retry bye 2
 retry cancel 2
 retry register 5
 timers register 250
 mwi-server dns:carriers.icall.net expires 3600 port 5060 transport udp
unsolicited
 registrar dns:carriers.icall.net expires 3600
 sip-server dns:carriers.icall.net

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