DID stands for Direct Inward Dialing — and it's one of those telephony concepts that sounds technical but is actually quite intuitive once explained. If you've ever dialed a company's 10-digit direct number and reached a specific person (not a receptionist or phone tree), you used a DID number. Understanding DIDs helps you design your business phone system more effectively.
How DID Numbers Work
Without DID, a business has one main phone number. All incoming calls hit that number, and your PBX or receptionist routes them to the right person or department. The caller always goes through a central point first.
With DID, your business has a bank of phone numbers that each map directly to a specific extension, department, person, or voicemail box. Callers who know the DID number bypass the main menu entirely and ring the specific destination immediately.
Common DID Use Cases
- Employee direct numbers — "Here's my direct number: (803) 555-1234." Clients bypass the main IVR and reach the employee's extension directly.
- Department direct lines — Sales gets one number, Support gets another. Both ring the appropriate ring group without going through the main auto-attendant.
- Dedicated fax numbers — A DID can be configured as a fax line, routing faxes to a vFax inbox rather than a phone extension.
- Direct marketing tracking — Assign a unique DID to each advertising campaign or lead source. Track which calls (and ultimately which deals) came from which marketing channel.
- Multi-location numbers — A business with offices in Columbia and Charleston might have one DID for each location, both routing through the same VoIP system.
How DID Numbers Are Assigned
In a VoIP system, you purchase DID numbers (from a pool of available local or toll-free numbers) and configure them in your portal to route to specific destinations. A DID might route to:
- A specific extension (individual employee's phone)
- A ring group (rings multiple phones)
- An IVR menu (plays a menu for the caller)
- A voicemail box
- An external number (forwarded to a mobile, for example)
Local DIDs vs. Toll-Free Numbers
Local DIDs have area codes that match a specific geographic market (803 for Aiken, 404 for Atlanta, 303 for Denver). They build local credibility — customers are more likely to answer calls from a local area code than an unfamiliar one.
Toll-free numbers (800, 833, 844, 855, 866, 877, 888) are routable from anywhere in the US at no cost to the caller. They convey a sense of national presence and are useful for customer service lines and marketing campaigns where you want to remove any barrier to calling.
DID Pricing
At Broadtela, local DID numbers are available for a small monthly fee per number (in addition to the per-seat VoIP cost). We can provision numbers in virtually any US area code, including all South Carolina, Georgia, and Colorado area codes. Toll-free DIDs are priced similarly. Vanity number searches are available at no extra search cost — we search available inventory for your preferred number pattern.