Direct dial

How a direct dial works

A company's phone system has three kinds of number. The main line rings a receptionist, a call queue or a phone menu. An extension is a short internal number that only works once a caller is inside the system. A direct dial is a full outside number that rings one person's desk phone or phone app.

The standard name for the desk version is direct inward dialing, or DID. ATIS defines it as a service feature that lets calls coming in to a PBX reach a specific extension without human intervention 1. The phone system maps each outside number to one extension, so a caller who dials it skips the receptionist and the menu. On a cloud or VoIP phone system, the same number can also ring a softphone app on a laptop.

Sales teams use the term more loosely. To a rep, a direct dial is any number that puts them straight through to the buyer, which often includes a work mobile. Many data vendors store the two in separate fields, and the mobile number field often sits next to the direct dial field in the same record.

A direct dial belongs to the employer. When the person leaves, the company usually reassigns or retires the number, so a direct dial goes stale with the rest of the job fields through data decay. A mobile usually stays with the person across jobs. That difference decides which number is worth paying for, and how often each needs a fresh check inside your B2B contact data.

How to tell a direct dial from a main line

Many phone fields in a contact record hold the company's main number. Four checks separate a real direct dial from a switchboard before a rep wastes a call.

• Compare it with the company number. If the phone field matches the number on the company's contact page, it is likely the main line.
• Read the label. Providers often tag numbers as mobile, direct, work or company. Keep the label with the number when you import it.
• Read the status field. RichAPI's phone finder documentation says to gate an auto-dialer on the status field, and never on the mere presence of a number 4.
• Test a sample. Call a small slice of new numbers and record how many reach the named person, a voicemail in their name, or a menu.

Rules for calling also depend on where the number sits. In the UK, the ICO says that live B2B marketing calls must not go to numbers on the CTPS or the TPS unless the business has consented, and some sole traders register with the TPS rather than the CTPS 2. In the US, the Telemarketing Sales Rule exempts most business-to-business calls, though calls that sell nondurable office or cleaning supplies stay covered 3. Keep a do-not-call list of your own either way, and check the rules for mobile numbers separately.

Example of a phone lookup for a call step

A sales team wants phone numbers for a call step and holds a LinkedIn profile URL for every contact on its list. RichAPI's phone finder takes a profile URL, or a first name, last name and company domain, and runs a provider waterfall cheapest first 4. It returns a mobile number in E.164 format and a status label, and it bills a flat 25 credits per successful call 4. That is a mobile, not a desk DID, so it fits the looser sales meaning of a direct dial. A miss uses the same response envelope with success set to false 4.

{"success": false, "result": null, "provider": null, "billed": false}

That miss bills zero credits, and so does any 4xx or 5xx response 4. If the run covers 400 contacts and finds 150 numbers, the team pays 3,750 credits for those hits and nothing for the 250 misses, so each number found costs 25 credits 4. Under per-request billing at the same price, all 400 calls would cost 10,000 credits, or about 67 credits per number found 4. The phone finder page makes the same point, that with zero-cost misses the hit rate sets the cost per contactable prospect and list size stops mattering 4.

The numbers found still need sorting before anyone dials. The team reads the status field on each one and sends only numbers with a status it trusts to the dialer 4. The rest go to a manual check or stay off the call step. For contacts with no number, the email finder is the next lookup, which is how a phone append step usually sits inside a waterfall enrichment flow.

Direct dial vs mobile number

Both reach the person, and callers often treat them as the same thing. A direct dial is a business line assigned by the employer. The desk version is a DID, a feature that lets inward calls to a PBX reach a specific extension without human intervention 1. A mobile number is usually the person's own phone, which stays with them when they change jobs. That makes a mobile last longer in a contact record. Calling rules can also differ between business lines and mobiles, so check them by country before a call campaign.