Polycom SIP 3.0.2 manual Multiple Registrations, IP 4000 supports a single registration

		Configuring Your System
Local	Web Server	For one-touch voice mail access, enable the “one-touch voice mail”
	(if enabled)	user preference and bypass instant messages to remove the step of
		selecting between instant messages and voice mail after pressing the
		Messages key on the SoundPoint IP 430, 500, 501, 550, 560, 600,
		601, and 650 (instant messages are still accessible from the Main
		Menu).
		Navigate to http://<phoneIPAddress>/coreConf.htm#us
		On a per-registration basis, specify a subscribe contact for solicited
		NOTIFY applications, a callback mode (self call-back or another
		contact) to call when the user accesses voice mail.
		Navigate to http://<phoneIPAddress>/reg.htm
		Changes are saved to local flash and backed up to <Ethernet
		address>-phone.cfgon the boot server. Changes will permanently
		override global settings unless deleted through the Reset Local
		Config menu selection and the <Ethernet address>-phone.cfg is
		removed from the boot server.
Multiple Registrations
	The SoundPoint IP 301, 320, 330, and 430 support a maximum of two
	registrations, the SoundPoint IP 501 supports three, the SoundPoint IP 550 and
	560 supports four, and the SoundPoint IP 600, 601, and 650 support 6. Up to
	three SoundPoint IP Expansion Modules can be added to a single host
	SoundPoint IP 601 and 650 phone increasing the total number of buttons to 12
	registrations on the IP 601 and 34 registrations on the IP 650. The SoundStation
	IP 4000 supports a single registration.
	Each registration can be mapped to one or more line keys (a line key can be
	used for only one registration). The user can select which registration to use for
	outgoing calls or which to use when initiating new instant message dialogs.
	Configuration changes can performed centrally at the boot server or locally:
Central	Configuration file:	Specify the local SIP signaling port and an array of SIP servers to
(boot server)	sip.cfg	register to. For each server specify the registration period and the
		signaling failure behavior.
		• For more information, refer to Local <local/> on page A-6and
		Server <server/> on page A-7.
	Configuration file:	For up to maximum number of registrations, specify a display name,
	phone1.cfg	a SIP address, an optional display label, an authentication user ID
		and password, the number of line keys to use, and an optional array
		of registration servers. The authentication user ID and password are
		optional and for security reasons can be omitted from the
		configuration files. The local flash parameters will be used instead.
		The optional array of servers and their associated parameters will
		override the servers specified in sip.cfg if non-Null.
		• For more information, refer to Registration <reg/> on page A-89.

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