Stillink VoIP Gateway, Signaling, Protocol Converters
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ISDN, SS7, V5.2 , CAS, VoIP Gateway and Signaling Converters  

Call Routing

Stillink has advanced routing algorithms.

Routing Capabilities

The advanced routing algorithm within the Stillink system is carried out in four steps:

  • First Step: Incoming A-Party Analysis
  • Second Step: B-Party (called-party) Pre-Analysis
  • Third Step: B-Party (called-party) Main Analysis
  • Fourth Step: Outgoing A-Party Analysis

The same routing algorithm is applied for both TDM and VoIP calls.

Incoming A-Party Analysis (optional)

Incoming A-Party (calling-party) analysis is the first (optional) step in Routing Analysis. It is applied to each originating or incoming interface. In order to facilitate this analysis, an incoming A-party analysis table is assigned to the originating user (TDM or VoIP). The incoming A-party analysis is done by analyzing the calling-party`s Number (up to 32 digits), Category, Nature of Address (or type of number), Numbering Plan, Presentation Status, Screening Status, etc. after which any or all of these parameters may be translated and then selected for a called-party pre-analysis table.

Called-Party Pre-Analysis (optional)

The Pre-Analysis is carried out prior to the main called-party analysis to truncate some called-party prefixes or reject certain addresses (destinations) altogether. Telesis has developed pre-analysis in order to simplfy the main analysis, especially for when a Stillink system services several operators in transit mode. Pre-analysis is applied to as many as 16-digit called-party prefixes.

Main Analysis

The main called-party analysis is carried out on the called-party prefixes resulting from the pre-analysis. Up to 16-digit-long prefixes may be analyzed. It is possible to define the minimum and maximum digits for starting the analysis. This analysis is date- and time-dependent, i.e., for different days of the week  and different times of the day, the analysis may result in different outcomes:

  • Route
  • Called-party number replacement (up to 32 digits)
  • Call class to be used for detailed CMDR
  • Authorization level necessary to realize the routing
  • Tariff

The route that is decided on after this analysis may be:

  • A V5.2 PSTN user
  • A  V5.2 BRI ISDN user
  • A SIP UA registered to the Stillink
  • A SIP resgistrar, proxy, server
  • An H.323 user registered to the Stillink
  • An H.323 gatekeeper
  • A trunk group from which the call is to be routed outward
  • A physical address of a TDM trunk port or channel
  • A subscriber or user service, which is available within the Stillink
  • A system service for maintenance and administrative purposes
  • A system resource like integrated voice mail, message-storage hardware etc.
  • A tone or a system message stored in the Stillink

Outgoing A-Party Analysis (optional)

Outgoing A-party (calling-party) analysis is the last (optional) step in the routing procedure. It is applied to the terminating or outgoing interface. In order to facilitate this analysis, an outgoing A-party analysis table is assigned to the called subscriber/outgoing trunk. The outgoing A-party analysis is done by analyzing the calling party`s number (up to 32 digits), Category, Nature of address, Numbering Plan, Presentation Status, Screening Status, etc. and, additionally, the Called-Party`s Nature of Address, after which any or all of these parameters may be translated.

 

Telesis A.S. 2006-2013
STB Design Services