Product Trivia
A DID Number lets businesses assign a unique phone number to each department or employee, without needing multiple physical phone lines.
How to Voice DID Number Work
Use Cases
Voice DID (Direct Inward Dialing) Number allows businesses to provide dedicated phone numbers that route callers directly to specific departments, services, or applications. It enables seamless inbound voice communication, supporting call routing, IVR flows, customer support, and automated voice workflows. With DID numbers, organizations can offer localized or international access points, improving reach, accessibility, and overall caller experience.
Banking and Finance
Banking and Finance
Banking and Finance
Frequently Ask Question (FAQ)
What is a Voice DID number?
A Voice Direct Inward Dialing (DID) number is a virtual phone number that routes incoming voice calls directly to a designated endpoint such as SIP trunk, PBX, call center platform, or external phone number without requiring physical phone lines.
How does call routing work for a DID number?
Incoming calls to a DID number are routed through the provider’s carrier network to your configured destination—SIP URI, IP address, forwarding number, or contact center platform—using SIP signaling and RTP for media transmission.
What types of DID numbers are available?
We provide Local DID, National, Toll-Free, and Mobile DID numbers depending on the country’s regulations and operator availability.
Can I forward DID calls to an external phone number?
Yes. DID numbers support call forwarding to PSTN or mobile numbers using global voice termination routes. Additional charges may apply based on the destination.
Do DID numbers support SIP trunk integration?
Absolutely. You can connect the DID number to your SIP trunk, PBX server, VoIP gateway, or call center solution via SIP/UDP or SIP/TCP.
What codecs are supported for voice traffic?
We support common codecs such as G.711 (A-law/μ-law), G.729, and in some cases OPUS, depending on country and carrier compatibility.
Can DID numbers receive DTMF tones?
Yes. DTMF is supported via RFC 2833, SIP INFO, and In-band, depending on your PBX configuration.
Are DID numbers compliant with local regulations?
Yes. Each country has its own compliance requirements. Some regions may require:
Business license documentation
Proof of address
End-user registration (KYC)
Compliance is mandatory before activation.
Do DID numbers support call concurrency?
Most DID numbers support unlimited or high concurrent channels, unless a specific country restricts channel capacity. You may scale channels based on traffic requirements.
How fast is the provisioning process?
Provisioning time varies by country:
Instant activation: Many global local numbers
1–3 business days: Countries requiring KYC validation
Up to 7 days: Regulated markets with strict telecommunication requirements