Concurrent Call Channel
Concurrent calls are phone calls active at the same time. One concurrent-call channel provides capacity for one call; two overlapping calls need two channels.
What does Concurrent Call Channel mean in practice?
Concurrent calls are inbound or outbound phone calls that overlap in time. A concurrent-call channel is one unit of that simultaneous-call capacity. It is different from calls per second (CPS): CPS limits how quickly new calls can start, while concurrency limits how many calls can remain active together. Phone numbers identify where calls arrive or which caller ID is shown; they do not create extra capacity. Several numbers can therefore share one channel and still allow only one active call at a time. The Dvaarik partner plan is ₹2,000 a month, flat at any client count, and usage is charged at wholesale: ₹0.30 for each call minute, in 30-second steps, and ₹0.03 for each AI reply. A Dvaarik live transfer temporarily needs two channels because the caller-to-AI leg and AI-to-human leg overlap. An active outbound campaign call also occupies one channel, so a business that wants to keep one inbound call path open while one campaign call runs needs at least two channels.
Step-by-step answer
How does Concurrent Call Channel work?
- 1
Count calls that overlap
Measure the busiest moment, not the daily total. Three calls happening together need three units of concurrent capacity even if the business makes only 20 calls that day.
- 2
Include ringing and connecting calls
A call can occupy capacity before the conversation is fully connected. Capacity becomes available again after that call ends or fails.
- 3
Keep numbers separate from channels
A phone number is an address or caller ID. Adding another number does not add another simultaneous call path unless another channel is also available.
- 4
Reserve capacity for transfers and campaigns
A Dvaarik live transfer needs two overlapping call paths. Each active outbound campaign call uses one path, so retain spare capacity if inbound callers must still connect.
Primary documentation
- Twilio Voice: call concurrency limit
Official documentation read 18 Aug 2026. Twilio defines concurrent calls as the inbound and outbound calls active on an account at the same time.
- Plivo Voice: account and feature limits
Official documentation read 18 Aug 2026. Plivo distinguishes active concurrent calls from CPS, the rate at which new calls start. Its provider-specific limits are not presented as Dvaarik limits.
Concurrent Call Channel FAQ
What does concurrent calls mean?
Concurrent calls are phone calls active at the same time. If one call is active and a second call starts before the first ends, the system is handling two concurrent calls.
Are concurrent calls and calls per second the same?
No. Concurrent calls measure how many calls are active together. Calls per second, or CPS, measures how quickly new calls can begin. A system can have a low start rate but many long calls active at once.
Do more phone numbers create more concurrent-call capacity?
No. Phone numbers identify call destinations or caller IDs; channels provide simultaneous-call capacity. A business or partner can use several numbers from its connected phone company account, but that account's concurrent-call limit still decides how many calls run at once.
How many channels are needed for two simultaneous calls?
Two simultaneous calls need two channels. For Dvaarik live transfer, two channels are also needed while the caller's AI leg overlaps with the outbound leg to the human recipient.
What happens when every channel on the connected phone account is occupied?
A new call cannot use an occupied channel. During an outbound campaign, Dvaarik warns that inbound callers receive a busy signal when the only channel is in use. For a human handoff without a spare channel, the configured callback fallback records the handoff instead of opening a second live leg.
What does Dvaarik charge for a phone channel?
Nothing. Dvaarik does not supply phone numbers: you connect your own Plivo, Telnyx or Twilio account, and that company bills you directly for numbers and call minutes. A business or partner connects its own phone company account (Plivo, Telnyx or Twilio), and that company bills number rental, call charges and capacity directly. Dvaarik's own fee is for each call minute: ₹0.50 direct or ₹0.30 partner wholesale, charged in 30-second steps.
Real example
A clinic has one reception number and two campaign caller IDs on a single channel. If a campaign call is active, an inbound patient call cannot connect on that same channel. A second channel lets one campaign call and one inbound call run together.
Related terms
More terms in this category
IVR (Interactive Voice Response)
IVR (Interactive Voice Response) is an automated phone system that greets callers and routes them using a menu — 'press 1 for sales, press 2 for support' — or spoken keywords, without a human answering first.
Missed Call Alert
A missed call alert notifies a business that an attempted phone call did not connect, usually with the caller's number and time, so someone can follow up. It records the attempt but does not answer the caller or capture why they called.
Cloud Telephony
Cloud telephony in India is business phone infrastructure delivered over the internet instead of office PBX hardware or physical phone lines: virtual numbers, cloud calling, call routing, recordings, logs, and voice APIs.
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