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Technical Bulletin
SoundPoint
®
IP, SIP 2.1
3
SIP 2.1 Server Fallback Implementation
In the SIP 2.1 release, the redundancy behavior of Polycom SoundPoint IP and
SoundStation IP phones has been changed and improved by adding the ability
for a single SIP Registration (Line) to be registered to more than one server
concurrently. In previous releases, the phone would only maintain one active
server registration per SIP Registration (Line). The concurrent server
registration capability adds an ability to do a faster and more efficient
hand-over to an independent call server both for incoming as well as outgoing
calls.
To assist in explaining the redundancy behavior, an illustrative example of
how a system may be deployed is defined in the following section.
Example Deployment
A small medium business (SMB) customer uses a hosted IP-Centrex service
from a Service provider. The Service provider has two redundant call servers
at their network operations center (NOC) and uses a DNS server to resolve the
IP addresses of these servers. The SMB customer also has an on-premise router
which has the ability to handle SIP call traffic and has a connection to an
on-site PSTN gateway. This gateway is intended to be used in conditions in
which the Internet connection to the service provider is not working.
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PSTN Gateway
Internet
PSTN
Hosted VoIP Service
Provider
VoIP SMB Customer
Premise
DNS Server
Call Server 1A
Call Server 1B
SIP Capable Router
Server2