Customer (Single- or Multi-Site) Without PSTN Prefix

Most of the calls made by these customers are PSTN calls. The Cisco Unified Communications Manager interprets calls without any prefix as PSTN or off-net calls. To differentiate between PSTN and intra- or inter-site calls, a prefix is required.

Single or Multi-Site Customer without PSTN Prefix

Dialing Format (A-Party)

Display Format (B-Party)

Notes

Intra-Site Dialing (single site only)

  • Extension Prefix + Extension (for example, *4321)

  • Extension Prefix + Extension

Since any digit 0-9 is treated as a PSTN call, extension prefix or ISP is limited to only * or #. For a single site customer, the dialing plan for intra-site calls is just an extension prefix + extension.

Intra-Site and Inter-Site Dialing (Multi-Site)

ISP + Site Code + Extension (for example, *2551234)

For a multi-site customer, it is recommended that extension dialing is not supported and all calls are dialed as ISP + Site Code + Extension.

Note:

ISP must not conflict with PSTN dialing and is therefore limited to * or #.

PSTN Dialing

  • PSTN Number (for example, 19197221234

  • E.164 Number (for example, +19728134321

  • NN

  • Local Number

  • E.164 Number (+CC NN)

There are several alternatives for display. Some of the phones support E.164 dialing (including + sign Some customers prefer to display the number as it would be dialed.

DN Format

  • Extension(Single Site) (for example, 4321)

  • Site Code + Extension (Multi-Site) (for example, 2554321)

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Multi-Site Customer with ISP