Polycom 1500 Administrator's Manual page 449

RealPresence Collaboration Server (RMX) 1500/1800/2000/4000 Administrator's Guide
Request to Speak is:
● Activated when the participant enters the appropriate DTMF code (default: 99).
The DTMF code can be modified in the conference IVR Service Properties - DTMF Codes dialog box.
● Available for dial-in and dial-out participants.
● A participant can request to speak more than once during the conference.
● Supported in all conference types.
● Supported in H.323 and SIP environments.
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