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Call Server Configuration
Polycom, Inc. 274
See also:
Call Server Configuration on page 233
Prefix Service on page 271
Embedded DNS
In a superclustered configuration, the clusters that make up the supercluster automatically take over for
each other in the event of an outage. In order to gain the full benefit of this feature, however, the endpoints
that are registered to each cluster must re-register to a new cluster when the new cluster takes over.
This can be accomplished by specifying the gatekeeper or SIP proxy that each endpoint will register to as
a site’s domain name, rather than an IP address. Then, when there is a failover, the DNS A record for that
site’s domain name can be mapped to a different IP address, changing the Call Server that each endpoint
is registered to.
The embedded DNS capability of the Polycom RealPresence DMA system automates this procedure.
Each Polycom RealPresence DMA server hosts its own embedded DNS server. It publishes a DNS CNAME
record for each site. That CNAME record maps to the active cluster with which endpoints at the site should
register. Whenever responsibility for the site moves from one cluster to another, the change is automatically
published by the embedded DNS server. Endpoints will automatically re-register to the correct cluster.
You can enable these embedded DNS servers on the Embedded DNS page. This is a supercluster-wide
setting.
If you wish to use this feature, your enterprise DNS must place the Polycom RealPresence DMA
supercluster in charge of resolving the sub-domain specified on this page. To do this, you must:
● Add NS records to your enterprise DNS so that it refers requests to resolve the site-based logical host
name (see Site Information Dialog Box) to these embedded DNS servers.
● Configure your enterprise DNS to forward requests for names in the site-based logical host name to
any of the clusters in the supercluster.
For more information, see Add Required DNS Records for the Polycom RealPresence DMA System.
Column Description
Type The type of service. Display only.
Name A display name for this service.
Code The vertical service code (VSC) for this service. Must consist of an
asterisk/star (*) followed by two digits.
Registered endpoints can activate this feature by dialing the VSC followed by
the alias. They can deactivate it by dialing the VSC alone.
Description Brief description of the service.
Enabled Clearing this check box lets you turn off the service.
Note: Embedded DNS Server does not support IPv6
The embedded DNS functionality is not supported in an IPv6 environment.