Hi!
As CER does not support overlapping dial-plan, the callback will always go to the phones of the partition listed first in the CSS of the
route point.
This is mentioned on the CER guide below:
"The dial plans must be unique between all Cisco Unified Communications Manager clusters supported by a Cisco ER cluster."
https://www.cisco.com/en/US/docs/voice_ip_comm/cer/7_0/english/administration/guide/e911ccm.html
The only thing you can do is as you said make the necessary changes (like Translation Patterns) to use a 10 digit number before reaching CER and the same number
for callback.
Regards,
Teresa.
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Regards,
Tere.
If you find this post helpful, please rate! :)