You would need to configure translation patterns that can be reached by the remote destination profile to change the ANI you send or to create specific route patterns only for mobility usage for the same purpose.
Be aware many telcos won't allow you to send a DN you don't own as ANI and might overwrite with something else like the main number.
Make sure you're sending a valid mask to the pstn.
HTH
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HTH
java
if this helps, please rate