This object specifies the base virtual template
for an APN. To create a sub-interface for each PDP or
Bearer, a base virtual-template needs to be configured so
that virtual-access interface can be cloned from it. Many
APN can share one base virtual-template. But one APN
can only use one base virtual-template.
This object must be set to appropriate value for IPv6
APN i.e., when the object cgprsAccPtIpv6Enable or
cgprsAccPtIpv6Exclusive is set to 'true'.