- When PB-ISDN receives an in-coming call from a local device, it goes to a look-up table and either converts the ISDN number to an IP address, or if it is an “off-network” call, it will route it to any locally-connected ISDN.
- NOTE: Patapsco are soon shipping a SIP-enabled version of PacketBand-ISDN which will access a SIP server for destination addresses, authorisation and billing.
- At this stage it can also change any of the dialled numbers or add a CLI.
- If the call is to be passed across the Packet Network, Layer 2 call set-up information is established to the remote end and the remote end will “ring”, showing any CLI.
- When the call is answered, the “B” channel(s) are established and the application has end-to-end connectivity.
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- From the calling PacketBand’s point-of-view, it receives the in-coming call from the Packet Network, checks to see if it is a valid number and authorised and then either passes the calling information to a local device or out to any locally-connected ISDN.
- PacketBand can inter-connect ISDN device and the ISDN network because the PacketBands are synchronised to a common clock.
- NOTE: Carriers and customers may want all calls routed to a single destination, such as a Class 5 switch, which then either routes the call back to a PB-ISDN across the Packet Network or out via the inter-connect with other carriers.
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