Hello,
Please provide more information about the issue you are facing?
Also you can refer the below link-
https://www.cisco.com/c/en/us/support/docs/unified-communications/expressway/213864-configure-business-to-business-audio-and.html
Thanks
Please rate if it is helpful and mark as accepted solution if applicable.
Thanks
Please rate if it is helpful and mark as accepted solution if applicable....