A destination number is the specific phone number, or SIP address, that a buyer designates as where an inbound call should ring once it has been routed to them. It is the last stop in the routing path: where the call actually lands.
How it fits into call routing
Once a marketplace decides a call belongs to a specific buyer, based on campaign and availability, it still needs to know where to send the audio. That is what a destination handles. A buyer can point delivery at a mobile number, a desk phone connected through a carrier, a SIP endpoint, or the browser softphone built into the platform.
What can serve as a destination
| Destination type | What it is |
|---|---|
| Phone number (DID) | A standard telephone number a buyer designates to receive calls. |
| SIP address | A VoIP endpoint identified by an address rather than a phone number. See SIP vs PSTN. |
| Browser softphone | Callmart's own softphone inside app.callmart.io, built on the Twilio Voice SDK. |
Why teams often use more than one destination
An agency with separate agent logins typically gives each agent their own destination, so calls land with the right person rather than a shared line. The owner can still see team usage across all of those separate destinations. A solo buyer may only need one.
Setting and changing a destination
Destination numbers are configured in the buyer's workspace, tied to the campaigns and delivery rules for that account. Getting a destination wrong, such as pointing at a disconnected number or an unstaffed line, can affect which calls count as answered and therefore which calls start accumulating connected time.
Destinations for wholesale and ping-based delivery
Wholesale buyers using buyer preacceptance ping still designate a destination for calls their system accepts. The ping step decides whether a proposed call is accepted at all; the destination decides where an accepted call actually rings.
What Callmart supports
Calls can be delivered to a phone number (DID) or a SIP address the buyer designates, or answered in the Callmart softphone. Availability of specific routing features depends on the services enabled for the account.
What happens when a destination cannot be reached
If a destination does not answer, whether because it is disconnected, busy, or simply not staffed at that moment, the call has no connected time and cannot be billed. From a buyer's side, this looks like a missed opportunity rather than a billing event: the call was offered and delivered, but never actually connected. Keeping a destination current and properly staffed is what prevents this from happening repeatedly.
A destination that intermittently fails to answer is worth investigating the same way a dropped signal on a phone line would be: check that the number or SIP endpoint is active, that call forwarding rules have not changed, and that whatever device or software is meant to ring is actually online. Testing a destination periodically, especially after any change to phone service, carrier settings, or team staffing, is a simple habit that avoids losing connected time to something that has nothing to do with the quality of the calls themselves.
- A forwarding rule was changed or removed on a carrier account.
- A SIP endpoint went offline or lost its registration.
- A device tied to the softphone lost network connectivity.
- A team member's personal device settings silenced or blocked incoming calls.
- 01Confirm the number or SIP address is activeCheck it directly with your carrier or VoIP provider before setting it as a destination.
- 02Enter it as your destinationSet it in your Callmart workspace against the campaigns you want it to receive.
- 03Test it before relying on itConfirm it rings the right device or system before using it for live volume.
Common questions
01What is the difference between a destination number and a DID?
A DID is one specific type of destination, a standard phone number. Destination is the broader term that also covers a SIP address or the browser softphone.
02Can I have more than one destination?
Yes, especially on an agency account where each agent typically has their own destination and login.
03Does my destination affect billing?
Indirectly. Connected time only starts once your destination answers, so a destination that does not answer correctly can prevent a call from ever reaching the buffer.
04Can I route calls to a SIP address instead of a phone number?
Yes. Buyers can designate a SIP address as their destination. See SIP vs PSTN for how that differs technically from a phone number.