When is voice worth adding?
When the phone is where your customers already are. Some people call because the matter feels urgent, some because they are driving or away from a screen, and some because talking is easier for them than typing. An AI agent on the line serves all three, at any hour, without a queue.
The clearest cases are visible in your own call data: calls that ring out or go to voicemail, a queue that backs up at peak, calls that arrive when nobody is in. Each of those is a customer who either waited or gave up, and the agent answers them the way it answers in chat, from the same knowledge.
The weaker case is a line that is mostly account work: changes that need verification, disputes, anything your agent would hand to a person in chat as well. Voice doesn't change that. The agent will mostly greet, gather details and transfer, and each of those calls still costs the minutes before the transfer.
What does a call cost next to a chat?
WireDesk prices voice at $0.20 per started minute, rounded up per call, and chat and email at $0.02 per agent reply. A four-reply chat is $0.08. An email answered in one reply is $0.02. A call that lasts three minutes ten seconds is four started minutes, so $0.80, ten times the chat.
Per-call rounding adds up across many short calls. A 70-second call bills as two minutes, and if call lengths are spread evenly, rounding adds about half a minute per call on average. So when you estimate, take your average call length and add half a minute: 1,000 calls averaging three and a half minutes come to about 4,000 billed minutes, or $800. The same 1,000 conversations as four-reply chats would be $80.
That $800 is the figure to set against what those 1,000 calls cost you today, whether that is your team's time on the phone, an answering service, or the customers lost when nobody picks up. Every plan's included usage is one allowance shared across channels: Growth's covers 300 voice minutes if it all goes on calls, Scale's 1,500. Past that, a monthly spend cap keeps the voice bill a decision rather than a surprise.
What do callers need from an AI agent?
First, to know they are talking to an AI. It is the courteous thing to do, and some jurisdictions now require it. WireDesk can say it for you: the agent's phone settings have a checkbox, 'On phone calls, say it's an AI and the call may be recorded', which speaks 'Quick heads-up: you're speaking with an AI assistant, and this call may be recorded' just before your greeting. It is off by default, because the decision is yours and your greeting may already cover it. For most support lines it should be on.
Second, honesty about recording. Rules differ by country and, in the US, by state, and several states require everyone on a call to consent to it being recorded. WireDesk stores a transcript of each call, not the audio, but a transcript is still a record of the call, which is why the disclosure mentions it. Take advice for the places your callers are in; this post is not legal advice.
Third, short answers and a way out. Speech has no scrollback, so a good voice agent answers in a sentence or two and checks before going on. A caller who asks for a person should get one: WireDesk transfers the live call to the handover number you set for the agent, and takes a message with the caller's number if the transfer fails or no number is set. For anything that needs follow-up, the agent can open a ticket in your helpdesk with the transcript attached and give the caller the ticket number.
How do we put it on our existing number?
Forward it. You buy a local number for the agent from the dashboard, with an area code if you want one, and set call forwarding on your published line at your carrier or phone system. Customers keep dialling the number they know. There is no porting and nothing to move: switch the forwarding off and calls go back to wherever they went before.
Forwarding is also the gentlest way to start. Many phone systems can forward conditionally (when the line is busy, when nobody answers, or out of hours) so the agent can take overflow and nights first while your team keeps the calls it already handles. If it covers nights, point the handover number at whoever is on call, or switch call transfer off out of hours: business hours govern chat and email handover, not call transfer.
Two more details. The handover number must be a different line from the one you forward, or a transferred call would loop back to the agent. And if your calls already run through your own SIP trunk or PBX and you would rather attach a number you own directly, we switch that on per workspace on request; it is not self-serve.
Before any of that, talk to the agent in the browser. It answers from the same content it will use on the phone, so ask it the questions your callers actually ask, and the ones it shouldn't answer.