LYNC: How to remove OCS Conference Dial-In from LYNC when OCS is decommissioned

Hi

I did a mistake and have decommissioned OCS systems, when I have forgot to move dial-in access number to LYNC.
The old access number is deprecated, since we use a new number on the LYNC and it works fine.
But, the old number still shows under "find a local number" which is somehow not hygienic.

The Get-CsConferenceDirectory PS lists me the following:

Identity             : 1
ServiceId            : UserServer:LYNC.domain.com
TargetServerIfMoving :
Id                   : 1
Fingerprint          : 4a72adaf-5ded-406b-b226-5015225200b3

Identity             : 3
ServiceId            : BackCompatSite-UserServices-1
TargetServerIfMoving :
Id                   : 3
Fingerprint          :

The Identity 3 is the one to be removed.

Do anyone has any ideas how to resolve this situation?
Thank you in advance

Herbert Knavs