Multi-Tech Systems MVP-2410/3010, MVP-410ST/810ST, MVP-130/130FXS manual Knowing When to Drop Digits

MultiVOIP User Guide Quick Start Instructions

(b)access codes. There are digits (PSTN access codes) that must be dialed to gain access to an operator, to access the publicly switched ‘long-distance’ calling system(North America), to access the publicly switched ‘national’ calling system (Europe and elsewhere), or to access the publicly switched ‘international’ calling system (worldwide).

There are digits (PBX access codes) that must be dialed by phones connected to PBX systems or key systems. Often a “9” must be dialed on a PBX phone to gain access to the PSTN (‘to get an outside line’). Sometimes “8” must be dialed on a PBX phone to divert calls onto a leased line or to a voip system. However, sometimes PBX systems are ‘smart’ enough to route calls to a voip system without a special access code (so that “9” might still be used for all calls outside of the building).

There are also digits (special access codes) that must be dialed to gain access to a particular discount long-distance carrier or to some other closed or proprietary telephone system.

(c)local exchange numbers. Within any calling area there will be many local exchange numbers. A single exchange may be used for an entire small town. In cities, an exchange may be used for a particular neighborhood (although exchanges in cities do not always cover easily discernible areas). Organizations like businesses, governments, schools, and universities are also commonly assigned exchange numbers for their exclusive use. In some cases, these organizational- assigned exchanges can become non-localized because the exchange is assigned to one facility and linked, by the organization’s private network, to other sometimes distant locations.

(d)specialized codes. Some proprietary voip units assign, to sites and phone stations, numbers that are not compatible with PSTN numbering. This can also occur in PBX or key systems. These specialized numbers must be handled on a case-by-case basis.

3.Knowing When to Drop Digits.

When calling area codes and access codes are used in combination, a leading “1” or “0” must sometimes be dropped.

Phonebook Entry Æ

Example

Area code for Inner London is listed as “0207.” However, in international calls the leading “0” is dropped.

U.K.

Country

Code

International	Leading Zero
Access Code	Dropped from
	Area Code

71