Polycom 3725-76302-001O manual Gateway Dialing Prefix Dialog Box on page 272. In this case

MCU Management

Field	Description
Signaling IP for SIP	The address that the MCU uses for SIP signaling. If you specify the login
	information for the MCU, this field is optional (the system can get the address
	from the MCU). If not, and SIP is enabled, this field is required.
Transport type	The SIP transport type to use with this MCU. If the Polycom RealPresence
	DMA system‘s security settings don’t allow unencrypted connections, this
	must be TLS.
Signaling type	Select SIP, H.323, or both, depending on the configuration of the Polycom
	RealPresence DMA system and the MCU.
Enable for conference rooms	Makes the MCU available as a conferencing resource for the Polycom
	RealPresence DMA system’s Conference Manager.
	Up to 64 MCUs can be enabled for conference rooms.
	Caution: Before adding an MCU to the RealPresence DMA system’s
	conferencing resources, make sure that MCU isn’t already a RealPresence
	Resource Manager system conferencing resource. The RealPresence
	Resource Manager system must have exclusive use of any MCUs on which it
	directly schedules conferences.
Enable gateway profiles	Makes the MCU available for selection as an ISDN gateway device and
	enables the Gateway Profiles tab for configuring gateway session profiles.
	Gateway session profiles indicate to the MCU the bandwidth parameters to be
	used for the ISDN connection. They can be used for:
	• ISDN gateway calls to the MCU’s direct dial-in prefix. In this case, the caller
	specifies the session profile prefix in the dial string:
	<direct dial-in prefix><session profile
	prefix><delimiter><E.164 number>
	• Calls to simplified ISDN gateway dialing prefixes (see Add Simplified ISDN
	Gateway Dialing Prefix Dialog Box on page 272). In this case, the
	RealPresence DMA system selects the MCU/gateway and its session
	profile. See ISDN Gateway Selection Process on page 139.
Class of service	Select to specify the default class of service and the bit rate limits for this
	MCU.
	If specified, calls to the MCU use its class of service or the calling endpoint’s,
	whichever is better.
Maximum bit rate (kbps)	Select the maximum bit rate for calls to this MCU.
Minimum downspeed bit rate	Select the minimum bit rate to which calls to this MCU can be downspeeded
(kbps)	to manage bandwidth. If this minimum isn’t available, the call is dropped.
	The minimum that applies to a call is the higher of the MCU’s and the calling
	endpoint’s.
Permanent	Prevents the MCU’s registration with the Call Server from ever expiring. For
	MCUs, this option should always be selected (the default).
Alert when MCU unregisters	If the MCU unregisters from the Call Server or its registration expires (if
	Permanent is turned off), an informational alert is triggered (see Alert 5003 on
	page 365).

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