A call manager receives a call setup request for a Voice over Internet Protocol
(VoP) call from a phone having an associated call originator. The call manager
then determines whether sufficient bandwidth exists for the VoP call over a link
using a bandwidth table. If insufficient bandwidth exists on the link for the VoP
call, the call manager presents a plurality of call completion options to the call
originator. One of the call completion options is a public switched telephone network
(PSTN) option. In response to the selection of the PSTN option, the call manager
routes the VoP call over a PSTN.