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242:. A telephone line is terminated at a telephone interface (fax modem) of a computer that runs fax server software. A set of digits of the assigned phone number is used to identify the recipient of the fax. This allows many recipients to have individual fax numbers while sharing only a few receiving interfaces (fax modems).
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within the organization without the need for an operator or attendant. The service provides inbound telephone service for many telephone numbers, often requiring far fewer physical telecommunication circuits to satisfy the demand for concurrent usage than the number of DID directory numbers provided.
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The majority of vendors charge a nominal amount per number per month (as little as $ 1/month in small quantities) and then bill per-minute or per number of channels which can be simultaneously in use. For the caller, these numbers can be assigned to locations which are a local call.
277:) for web or e-mail delivery. The fax traffic never passes through the VoIP infrastructure as a dial-up modem call and therefore arrives reliably even if T.38 is not properly supported at some points in the network.
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over one or more analog or digital physical circuits to the PBX, and transmits the dialed telephone number to the PBX so that a PBX extension is directly accessible for an outside caller, possibly by-passing an
355:(DDCO). This service is often combined with DID service and allows direct dialing of global telephone numbers by every extension covered by the service without the assistance of an operator. The
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For voice-over-IP resellers, some specialized CLECs (for local numbers) or interexchange carriers (for toll-free numbers) will deliver blocks of direct inward dial calls already converted to
316:(SIP) or common VoIP formats. The individual VoIP provider need only obtain an inventory of local or freephone numbers from VoIP-aware carriers in various regions, import them in bulk to an
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to the customer. Calls to such numbers are forwarded to the customer's PBX via the trunks. As calls are presented to the PBX, the dialed telephone number is signaled to the PBX with
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should have allowed VoIP subscribers to keep their existing fax equipment working locally; in practice, T.38 at the subscriber's site offers no benefit if the upstream provider is
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UK geographic DID numbers can often be obtained for free and can be terminated over SIP. A few US DIDs are available without monthly charges from vendors like
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to gateways that do not support T.38 and cannot reliably send or receive fax/modem traffic. A fax server at a central location, connected directly to
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service offered by telephone companies to subscribers who operate private branch exchange (PBX) systems. The feature provides service for multiple
184:(DNIS) using a prearranged, usually partial format, e.g., the last four digits. The PBX may use this information to route the call directly to a
204:(POTS) lines for which the central office provides signaling and talk battery. More recently, it was far more common to deliver DID service on
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equipment detects the level of the line and disables service if the circuit is not operational. This is the reverse arrangement from standard
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of an extension for outgoing calls is often set to the extension DID number but may be the organization's central switchboard number.
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lines and using direct inward dial to identify the intended addressees can convert incoming faxes to electronic documents (such as
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and issue them individually to end users. International DID numbers can be purchased in bulk from international providers.
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The trunks for DID service are unidirectional, inbound to the customer PBX. However, the service may be combined with
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215:(DOD) allowing PBX extensions direct outbound calling capability with identification of their DID telephone number.
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297:. The gateway connects the PSTN to the VoIP network, routing and translating calls between the two networks.
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In countries with multiple competing local providers, DID services can be purchased in bulk from a
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249:(VoIP) vendors have used one central, remotely located fax server as a means of offering
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293:(PSTN) users to directly reach users with VoIP phones, DID numbers are assigned to a
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Historically, DID service used analog circuits. In these types of DID trunks the
439:"CommPeak - VoIP Provider, Cloud PBX, DID Numbers, SMS and Auto Dialer Services"
403:"Understanding Direct-Inward-Dial (DID) on IOS Voice Digital (T1/E1) Interfaces"
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to the customer for connection to the customer's PBX, and allocates a range of
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CommPeak - VoIP Provider, Cloud PBX, DID Numbers, SMS and Auto Dialer
Services
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to a central office exchange, corresponding to DID, is
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service to their clients. In theory, standards such as
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https://www.fonada.com/blog/direct-inward-dialing-did/
60:. Unsourced material may be challenged and removed.
218:In the United States the feature was developed by
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222:in the 1960s, patterned upon the earlier
120:Learn how and when to remove this message
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168:For direct inward dialing service, the
329:call to some expensive, rural location
285:DID service has similar relevance for
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373:Dialed Number Identification Service
182:Dialed Number Identification Service
58:adding citations to reliable sources
307:competitive local exchange carrier
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291:public switched telephone network
263:public switched telephone network
289:(VoIP) communications. To allow
196:provided signaling battery. The
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45:needs additional citations for
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343:The outgoing service from a
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238:DID service is also used by
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314:Session Initiation Protocol
202:plain old telephone service
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164:Plain old telephone service
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353:direct dial central office
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349:direct outward dialing
339:Direct outward dialing
295:communications gateway
267:primary rate interface
213:direct outward dialing
206:Primary Rate Interface
172:provides one or more
133:Direct inward dialing
18:Direct inward dialing
69:"Direct inward dial"
54:improve this article
470:Telephone exchanges
234:Use in fax services
228:Deutsche Bundespost
186:telephone extension
427:. January 4, 2010.
259:least-cost routing
178:telephone numbers
170:telephone company
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110:January 2017
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52:Please help
47:verification
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240:fax servers
174:trunk lines
389:References
80:newspapers
425:Webopedia
378:Dial plan
361:caller-ID
359:(CLI) or
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367:See also
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220:AT&T
301:Sellers
94:scholar
325:IPKall
318:IP PBX
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407:Cisco
245:Some
101:JSTOR
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453:4. "
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255:T.38
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345:PBX
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