ISDN Protocol Administrator's and Developer's Guide ... - Intervoice

Optional EntriesThe optional entries for implementing Non-Facility AssociatedSignaling include:[ISDNNumNonNegotiableChannels]Prevents glare on bi-directional lines. Glare exists when an OmviaMedia Server tries to place an outbound call at the same time thatthe switch tries to place an inbound call.Normally, systems hunt for lines on which to process transactions.Switches normally hunt from lowest to highest channel. The OmviaMedia Server hunts from highest to lowest channel. When the twohunts collide, glare occurs. The[ISDNNumNonNegotiableChannels] entry reserves the specifiednumber of B Channels as non-negotiable, meaning they cannot beused for another purpose.[ISDNNumNonNegotiableChannels]1 ; Span number1 ; Number of non-negotiable channels2 ; Span number1 ; Number of non-negotiable channelsThe preferred/exclusive flag should be marked exclusive when theservice provider is provisioning the spans on the switch duringconfiguration. This is primarily for systems that have a test channelper system in which the call should not be negotiated. That way, thecall is guaranteed to set up on the targeted system and not getnegotiated to another one, especially in the case of NFAS.[ExplicitNonNegotiableChannels]Specifies specific channels to exclude from negotiation. Ifnegotiation is allowed, overlap can occur and cause difficultiesbetween lines.Leaving channels excluded from negotiation provides a buffer thatkeeps channels free, and prevents overlap on channels between theswitch and the Omvia Media Server.[ExplicitNonNegotiableChannels];8-8 ISDN Protocol Administrator’s and Developer’s Guide 60001262, First Edition