Polycom 3725-77601-001H manual Alias@IP , for example

User Management Operations

Field	Description
Dial Options	Specify whether the guest will dial into conferences,
	or require that the system dial out to the guest.

Note

To support both options, create a separate Guest

Book entry for each.

3If the guest has an H.323 (IP) endpoint, configure these settings:

Field	Description
Number and	The specific dial string for the guest, and the format
Number Type	of the number that the MCU must resolve to contact
	the guest. This may be an IP address, E.164
	address, H.323, or Annex-O.
	For Annex-O dialing, in the Number field enter the
	H.323.alias@IP, for example:
	•	1001@11.12.13.14
	•	1001@domain.com
	•	username@domain.com
	•	username@11.12.13.14

	Notes
	• Polycom endpoints must register with a
	gatekeeper before they will attempt an Annex-O
	call.
	• You can enter a dial string for another MCU as a
	guest. If so, you may need to specify the
	conference ID in the Extension field also.
Extension	Use this field to connect the conference to another
	conference on another MCU. In this field, specify the
	conference ID or passcode for the conference on the
	other MCU.
MCU Service	Choose from the list of MCU services defined on the
	MCUs with which the CMA system is registered.
	Leave this at Any Available Service unless you
	have specific knowledge of MCU services.

4If the guest has a SIP (IP) endpoint, configure these settings:

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