Hybrid Model

The hybrid model is useful for environments that want a keyswitch feel, where each line maps directly to a PSTN line, but also want to allow simple intra-office calling. In a pure keyswitch environment with three lines on each phone, an intra-office call between two employees would use up two of the lines, leaving only one line remaining for incoming or outgoing PSTN calls. In the hybrid model, each user would receive a unique extension in addition to the shared "keyswitch" lines, as shown in Figure 4.5.

Depending on your configuration, the extension unique to each user may or may not be able to reach the PSTN. If you have a limited number of PSTN lines available at the office, you may want to restrict PSTN access from the unique extension on each phone. You can also have this unique extension be the default active line when the user picks up the phone so that a user does not temporarily tie up one of the shared, PSTN lines each time the receiver is lifted.

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Figure 4.5 Cisco Unified CME Hybrid Model

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