Transfer ringback tone

[bcmir]

All,
I am transferring a call from Extn 101 on OXO A to Extn 201 on OXO B
The issue is the transfer ringback tone over the Private Numbering network.
Call transfer from Extn 101 to Extn 102 (both on OXO A) play the correct standard ringback tone.. the issue is only when transferring from OXO A to B.

At the moment it is the OXO Tone (same tone as can be used for MOH).
How can I change it to normal ringback tone or use MOH as ringback tone?

[bcmir]

I checked 'Generate ringback for external calls'... now at least we get ringback instead of double-beeps.... but no MOH.. I guess this is beyond the OXO