The A/V Conferencing Service and Mediation Server can be collocated on a Front End pool. Collocation requires fewer computers, ...

The A/V Conferencing Service and Mediation Server can be collocated on a Front End pool. Collocation requires fewer computers, but in larger deployments a standalone A/V Conferencing pool and/or Mediation Server pool can provide better voice quality and greater scalability.  For a Standard Edition Front End Server, the A/V Conferencing service is always collocated.