The setup and release of VCCs at the user-network interface (UNI) can be performed in various ways:
• Without using signaling procedures. Circuits are set up at subscription with permanent or semipermanent connections.
• By meta-signaling procedures, where a special VCC is used to establish or release a VCC used for signaling. Meta-signaling is a simple protocol used to establish and remove signaling channels. All information interchanges in meta-signaling are carried out via single cell messages.
• User-to-network signaling procedures, such as a signaling VCC to establish or release a VCC used for end-to-end connectivity.
• User-to-user signaling procedures, such as a signaling VCC to establish or release a VCC within a preestablished VPC between two UNIs.
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