asterisk users - Jun 2011 - Setting the Source IP on asterisk 1.8

I am running Asterisk 1.8 on Slackware linux.  The system is running fine we
just added a new SIP trunk from XO and I am having problems getting it to
place outbound call.
I am working with XO support but getting little to no help.

Has anyone gotten SIP Trunking working with XO SIP Trunking.  From all I
have read it is suppose to work.

Thanks in advance.
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