Polycom 3725-76302-001O manual Rule Effect, Edit Site Dialog Box on

	Call Server Configuration
Rule	Effect
1 Dial registered endpoints by alias	If the dial string is the alias or SIP URI of a registered endpoint, the call
	is routed to that endpoint.
2 Dial by conference room ID	Otherwise, if the dial string is the dial-in number of a conference room
	on the Polycom RealPresence DMA system, the call is routed to that
	conference room.
3 Dial by virtual entry queue ID	Otherwise, if the dial string is the dial-in number of a virtual entry queue
	on the Polycom RealPresence DMA system, the call is routed to that
	VEQ.
4 Dial by Lync conference ID	Otherwise, if the dial string is the dial-in number of a Lync conference
	on the Lync AVMCU, the call is routed to an available Polycom MCU
	that supports Lync 2013 and automatically connected to the
	corresponding Lync conference on the AVMCU. (If no Polycom MCUs
	that support Lync 2013 are available, the conference fails to start).
5 Dial services by prefix	Otherwise, if the dial string begins with the configured prefix of a service
	(such as an MCU, ISDN gateway, SBC, neighbor gatekeeper, SIP peer
	proxy, or simplified ISDN dialing service) the call is routed to that
	service.
	Note: For a SIP peer, the dial string must either include the protocol or
	consist of only the prefix and user name (no @domain). For instance, if
	the SIP peer’s prefix is 123, the dial string for a call to
	alice@polycom.com must be one of the following:
	sip:123alice@polycom.com
	123alice

6Dial external networks by H.323 Otherwise, if the address is an external address, the call is routed to

URL, email ID, or SIP URI	that external address (H.323 calls use the designated SBC for the
	originating site to reach addresses outside the enterprise network; see
	Edit Site Dialog Box on page 285).
	Examples of external addresses:
	H323:johnsmith@someothercompany.com
	sip:johnsmith@someothercompany.com
7 Dial endpoints by IP address	Otherwise, if the address is an IP address, the call is routed to that IP
	address (H.323 calls use the designated SBC for the originating site to
	reach addresses outside the enterprise network).
	Examples of IP addresses:
	1.2.3.4
	1.2.3.4##abc
	sip:abc@1.2.3.4
	sip:1.2.3.4@mycompany.com

If you have special configuration needs and want to modify the dial plan, be aware that some of the default dial rules are necessary for “normal” operation. Removing or modifying them takes the system out of compliance with ITU and IEEE standards.

Here are some suggestions and guidelines for modifying the dial plan:

Polycom, Inc. 242