Host teleconference broadcast rest VOIP

No, but each user can select their choice when they enter the meeting. The Host can prevent any VOIP users from using the mics if that is the concern.

this from the help system:

Audio for meetings is not enabled by default. To start an audio conference, do the following:

1. Navigate to the Meeting Information page for a specific meeting.
2. Click Enter Meeting Room.
3. From the Audio menu, choose one of the following: Microphone Rights for Participants This option appears if there is no audio profile attached to the meeting. Choose this option to enable audio conference using VoIP.
   Start Meeting Audio This option appears if an audio profile is attached to the meeting.
   
4. Specify how you want the attendees to join the meeting’s audio conference. You can specify one or more of the following. The availability of the options depend on the meeting’s audio and system configuration. Using Computers Choose this option if you want attendees to join the audio conference using their computer speaker and microphone (VoIP). All users can hear meeting audio using the computer’s speakers. To enable Participants to speak, click Enable Microphone Rights for Participants.
   Using Phone Choose this option if you want attendees to join the audio conference over the telephone. Users can dial-in to the audio conference or receive a call from the meeting. Click Start Broadcasting Telephony Audio to enable attendees using computers to interact with attendees on phones.
   
   Note: If Universal Voice is configured, you can select both options. Participants can join the audio conference either using their computer’s microphones, or join the meeting using their phone. Start broadcasting to enable participants to hear any telephone-based audio through the computer speakers and broadcast their voices to telephone users using the microphone. When you stop broadcasting, VoIP users will be audible to phone users, but phone users will not be audible to the meeting users.
   
5. Click Start.

Once meeting audio has been started, attendees need to join the audio conference.