Yes. Genesys Cloud BYOC Cloud can be added to existing or new organizations that use Genesys Cloud Voice. For example, a Genesys Cloud Voice customer may want to route certain calls to an IP-PBX. A BYOC Cloud trunk could be created between Genesys Cloud and the IP-PBX and Number Plans, and Outbound Routes could be configured to deliver the appropriate calls to the IP-PBX by the BYOC Cloud Trunk rather than the Genesys Cloud Voice PSTN trunks.