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VoIP Networks with PSTN — Example 13
Page 3-31
VoIP Networks with PSTN — Example 13
North American PSTN and VoIP Calls
This dialing scheme is used for calls going through the North American PSTN and the VoIP
Network. The following four diagrams are used to demonstrate how these calls are handled:
• North American PSTN Calls — Overview
• North American PSTN Calls — Outbound
• North American PSTN Calls — Inbound
• North American PSTN Calls — VoIP Network
Note that DID (Direct Inward Dial) is used only on inbound calls, and that all calls are
connected using the North American Numbering Plan (NANP) that also includes Canada. See
Dialing Scheme Example 15 for details on North American and International calls going
through the PSTN or the VoIP network.
To use this dialing scheme, the voice phone group type must be set to NANP extensions. The
site prefix digits and strip digits must be set to seven digits. NANP PSTN numbers depend on
the configuration of the local exchange, of which there are three types: 1) those that support
7 digit dialing to get calls across the street (nxx-xxxx), and 2) those that support 10 digit dial-
ing to get calls across the street (npa-nxx-xxxx) where NPA is the area code, and 3) those that
support 11 digit dialing to get calls across the street (1-npa-nxx-xxxx) where npa is the area
code.
When using voice phone group type NANP PSTN, the PSTN functionality is supported with
the following exceptions:
• DID extensions (add numbers) and the NANP PSTN cannot be the same numbers.
• DID extensions (add numbers) and the site prefix digits cannot be the same numbers.
• Site prefix digits and NANP PSTN numbers cannot be the same numbers.
The phone group type NANP PSTN may be substituted by using site prefixes (forces callers to
dial one or more digits, e.g., 9, to place an external call. For more information on using site
prefixes, see also
VoIP Networks without PSTN — Example 10 on page 3-25.
♦
Cautions
♦
Voice daughtercards using either voice phone group
type of NANP PSTN or International PSTN dialing
schemes cannot handle PBXs with extensions starting
with 0, 1, 411 or 911. The following extensions are also
not allowed: 0000 to 0999, 1000 to 1999, 4110 to 4119,
and 9000 to 9999. (For more details, see Chapter 5,
“VoIP Commands.”)
Companies using Alcatel’s VoIP feature are responsible
for programming and testing all dialing schemes to
reduce the likelihood or to eliminate the possibility of
toll fraud from the PSTN.