Polycom SIP 2.2.0 manual Presence, Phone Operation for Registration

Configuring Your System

	Phone Operation for Registration
	After the phone has booted up, it will register to all the servers that are
	configured.
	Server 1 is the primary server and supports greater SIP functionality than any
	of servers. For example, SUBSCRIBE/NOTIFY services (used for features such
	as shared lines, presence, and BLF) will only be established with Server 1.
	Upon registration timer expiry of each server registration, the phone will
	attempt to re-register. If this is unsuccessful, normal SIP re-registration
	behavior (typically at intervals of 30 to 60 seconds) will proceed and continue
	until the registration is successful (for example, when the Internet link is once
	again operational). While the primary server registration is unavailable, the
	next highest priority server in the list will serve as the working server. As soon
	as the primary server registration succeeds, it will return to being the working
	server.
Note
	If reg.x.server.y.register is set to 0, then phone will not register to that server.
	However, the INVITE will fail over to that server if all higher priority servers are
	down.
	Recommended Practices for Fallback Deployments
	In situations where server redundancy for fall-back purpose is used, the
	following measures should be taken to optimize the effectiveness of the
	solution:
	1. Deploy an on-site DNS server to avoid long call initiation delays that can
	result if the DNS server records expire.
	2. Do not use OutBoundProxy configurations on the phone if the
	OutBoundProxy could be unreachable when the fallback occurs.
	SoundPoint IP phones can only be configured with one OutBoundProxy
	per registration and all traffic for that registration will be routed through
	this proxy for all servers attached to that registration. If Server 2 is not
	accessible through the configured proxy, call signaling with Server 2 will
	fail.
	3. Avoid using too many servers as part of the redundancy configuration as
	each registration will generate more traffic.
	4. Educate users as to the features that will not be available when in
	“fallback” operating mode.

Presence

The Presence feature allows the phone to monitor the status of other users/devices and allows other users to monitor it. The status of monitored users is displayed visually and is updated in real time in the Buddies display screen or, for speed dial entries, on the phone’s idle display. Users can block others from monitoring their phones and are notified when a change in

4 - 37