Cisco Cisco Prime IP Express 8.3 Technical References

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Releases the address associated with a Network Registrar Lease object. If reserved, the associated reservation is
also removed.
Request:
DELETE /web-services/rest/resource/Lease/{objectName}
objectName
: string representation of the Lease address property. Use the '-' character in place of
the '/' character, if present in the address name. 
Query Parameters 
  vpnId: the VPN identifier for the address, if applicable
Response:
Content: none