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Gateway Mode

Overview

You can configure the IP Network Interface Series 2 card for Gateway Mode which increases the capacity of the CSP to 4,096 physical channels for connections that comprise both circuit-switched and packet-switched channels.

Gateway Mode is not supported on the VDAC-ONE card.

Important! A successful connection requires at least one channel in Normal (Non-Gateway) Mode. A call cannot be placed between two Gateway Mode channels.

TDM/IP Gateway

The diagram below shows how the CSP can be used in gateway mode, specifically as an SS7 front end gateway.

Figure 3-9 TDM/IP Gateway

Call Flow

The following call flow reflects a network like the one in the previous diagram.

DSP Cards

The DSP-ONE and DSP Series 2 cards both operate in Gateway Mode only. A call or connection cannot be placed between two Gateway Mode channels. Therefore you cannot have media services (such as Digit Collection, Tone Generation, and Announcement Playing) on Gateway Mode IP Network Interface Series 2 card channels. You can have a "gateway" call that involves a Normal Mode TDM channel and a Gateway Mode IP Network Interface Series 2 card channel with DSP services on the TDM channel only.

EXNET-ONE Card

The EXNET-ONE is a Gateway Mode card and does not operate with the IP Network Interface Series 2 card when it is in Gateway Mode. Connections can not be made between IPN 2 channels in Gateway mode across the Exnet® ring.

Resource Attribute Configure message

See the Gateway Mode TLV in the Resource Attribute Configure message in the API Reference.

Internet Protocol. Part of the TCP/IP family of protocols used to route messages and tracks the addresses of nodes.
A device that translates calls between an IP network and another network, typically the PSTN.
See Time Division Multiplexing.
See Signaling System Number Seven.
Digital Signal Processor
Excel's open architecture, proprietary, 1.3 Gbps fiber optic network using a packet-based protocol.
Tag-Length-Value block. A standardized block that allows data to inserted in a standard way into API messages.