79afe4ac_nfiguring_the_Blades___DocWiki__Parameter
[Default] HDB3 [Explanation] Specifies the zero code suppression for the span. Determined by the service provider. We recommend using HDB3 only. [Possible Values] HDB3 [Parameter] 
Zero code suppression
Cisco Unified MeetingPlace Release 6.1 -- About Configuring the Blades - DocWiki