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SIP to FXO not working

I have have 2 UC series boxes connected via SIP dial-peers.  Read as simple site-to-site peers.

Box 1 has an FXO port connected to the PSTN.

If a call comes in from box 2 via the SIP dial-peer,  with digits matching the destination-pattern of the POTS dial-peer, the  call fails.

If I attempt to dial the same pattern from a registered SCCP phone on box 1, the call succeeds via the POTS line.

I also tested with x-lite SIP client pointing it to an  inside IP of box 1 dialing the same pattern and the call failed to  complete via the POTS.

Also on Box 1 I have a SIP trunk  to an ITSP and all calls to that trunk via any phone, including  unregisterd x-lite, complete successfully.

It is only when I attempt an outbound call that is SIP to FXO.

Ideas?

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