Polycom SOUNDPOINT SIP 3.1 - Manual (Page 114)

Administrator’s Guide SoundPoint IP / SoundStation IP
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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.
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
monitored status occurs. Phone status changes are broadcast automatically to
monitoring phones when the user engages in calls or invokes do-not-disturb.
The user can also manually specify a state to convey, overriding, and perhaps
masking, the automatic behavior.
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.
Note Notification when a change in monitored status occurs will be available in a
subsequent release.