
SMG digital gateway
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APPENDIX D. CORRELATION BETWEEN ROUTING, SUBSCRIBERS, AND SIGNAL LINK PARAMETERS
An incoming call from an IP or TDM channel arrives to the incoming interface, then the call further routing
is determined by a trunk group (TG) using the RADIUS protocol (if applicable). The TG performs number
modifications for incoming communication. After that, the call is routed by prefix into the outgoing channel or to
a SIP subscriber. If a "direct prefix" is configured in the incoming TG, the call is routed to the outgoing TG
configured in the prefix parameters without caller and callee number analysis. The outgoing TG performs
number modifications. After that, the call arrives to the outgoing interface/channel. If the outgoing direction in
not available, the call will be directed to the backup direction (if configured).