Seasonal call overflow: busy and no-answer forwarding to Anna in peak season

When the overflow happens

Peaks differ by trade and by region, and the only reliable peak is the one in your own call log. Export two years of calls by week, mark the weeks where unanswered calls climb, and plan forwarding for those weeks.

For one trade there is public data. ServiceTitan's call records for residential HVAC contractors show off-hours calls rising in summer, and the two figures below are from that study.

• After-hours weekday calls (before 8 a.m. and after 5 p.m.) peaked at 9.3% of HVAC contractors' inbound calls in June, against 6.8% in October. Method: anonymized inbound call records from ServiceTitan customers' residential HVAC contractors, January to December 2025, tenant-weighted across a same-store cohort active all twelve months; the study says it is not nationally representative. Checked 2026-10-18. Source: ServiceTitan State of the Trades, June 3, 2026.
• Weekend calls peaked at 4.9% of inbound calls in August, against 2.95% in October. Method: the same ServiceTitan call records, with weekend hours counted in each contractor's local time zone; the study describes timing patterns and does not establish causes. Checked 2026-10-18. Source: ServiceTitan State of the Trades, June 3, 2026.

The three forwarding settings that matter

Phone carriers and business phone systems use the same three ideas under different names. Pick the ones that match the problem.

• Forward when busy. The call moves on when your line is already in use. This is the core overflow rule, because a second caller never hears a busy tone.
• Forward on no answer. The call moves on after a set number of rings. This covers the caller who rings while everyone is on a roof.
• Forward always. Every call moves on at once. Use it for a whole after-hours window or a storm week, and switch it off afterwards.

• Verizon calls its busy and no-answer rule conditional forwarding: a call goes to the number you set when the phone is busy or unanswered after 3-6 rings. Method: read from two Verizon support pages, one giving the code *71 followed by a 10-digit number to turn it on and one giving *73 to turn it off. Checked 2026-10-18. Sources: Verizon call forwarding support and Verizon: turn call forwarding off.
• T-Mobile lets you forward if you do not answer, if the phone is off or if you are out of signal range, only to 10- or 11-digit numbers and not to international numbers. Method: read from T-Mobile's calling services page, which describes the settings without listing codes. Checked 2026-10-18. Source: T-Mobile calling services.

Other carriers and VoIP systems differ, and codes on third-party blogs are often out of date. Use your carrier's own page or your phone system's admin screen, and confirm with a test call before relying on it.

Forwarding setup checklist

1. Get the forwarding number. Our team gives you the number assigned to Anna during onboarding; never forward to a number from a stranger or a blog.
2. Choose your rule. Busy plus no-answer for overflow, or forward-always on a schedule for a storm week.
3. Set the ring count. A short count gets callers to Anna sooner and gives your staff less time to pick up; a long count does the opposite. Start at 4 and adjust after a week of logs.
4. Turn the rule on from your phone's call-forwarding menu, the carrier code on the carrier's own page, or your phone system's admin screen.
5. Test three calls: one while your line is busy, one left unanswered, and one routine call you answer yourself. Check that the first two reach Anna and the third does not.
6. Decide your emergency number so an urgent call goes to a person on your side and not to a message.
7. Write down how to switch it off and who is allowed to, so a forgotten rule does not forward your calls in January.

Sample call flow: one overflow call in a heat wave

Sample flow, not a recorded call. Features marked "where on" depend on what your account has switched on.

1. The caller dials your public number while your line is busy, so the carrier forwards the call to Anna.
2. Anna greets the caller with your business name and asks what is wrong and where.
3. A caller with an urgent problem, such as no cooling for a vulnerable occupant, is passed by emergency transfer to the number you named.
4. For a routine request she runs check availability for the day the caller wants and books a slot, where booking is on.
5. A confirmation text follows for the caller who booked, where texting is on; a caller who needs to reschedule or cancel is handled the same way.
6. A caller who would rather not book leaves a message, or asks for details and gets a follow-up email.
7. When your staff are free and the caller asks for a person, Anna transfers the call to your own team.
8. Once the call ends, the call summary is emailed to the address set for call summaries.

A second caller can reach Anna while the first is still talking. VantaWeb publishes no concurrent-call figure, so ask for one in writing before you rely on a storm week.

What a busy month costs

VantaWeb is $0.41 a minute plus $45 a month for the receptionist number. VantaWeb bills each call by the minute, rounded up, so the table assumes every call is billed as 3 minutes. That is an assumption, not a measurement; time your own calls, round each one up to the minute and substitute your average.

Premium voice is $0.51 a minute. Website chat is $0.04 per message and needs no receptionist number.

Questions about overflow forwarding

What is seasonal call overflow?

It is the period when inbound calls exceed what your team can answer, such as a heat wave, a storm week or a spring rush. Calls that find the line busy or go unanswered are the overflow. Forwarding those calls to an answering service or AI receptionist keeps callers from reaching voicemail or a busy tone.

How do I forward only busy and unanswered calls to Anna?

Turn on your carrier's busy and no-answer forwarding and enter the number our team gives you in onboarding. On Verizon that is *71 followed by the number; other carriers use a phone menu or their own code. Test with a busy line and an unanswered call before you rely on it.

How many rings should I wait before the call forwards?

Verizon describes forwarding after 3-6 unanswered rings. Fewer rings reach Anna sooner but give your staff less time to pick up; more rings favor your team. Start at four, read a week of call logs, and move one ring at a time. The right number depends on how fast your staff really answer.

Can Anna take several overflow calls at once?

A second caller can reach Anna while the first is still talking. VantaWeb publishes no figure for how many simultaneous calls an account can handle, and has no storm-week load test to cite. If your peak depends on a number, ask for it in writing and test it with a few simultaneous calls.

What does a peak month cost on VantaWeb?

VantaWeb is $0.41 a minute plus $45 a month for the receptionist number. At 100 overflow calls, each billed as 3 minutes, that is 300 billed minutes and $168 for the month. Your own average call length changes the total, so time your calls first.

Pick someone else if

Facts as read on 2026-10-18. Overflow forwarding is the wrong answer in these cases:

• Your dispatch lives in ServiceTitan. ServiceTitan's AI Virtual Agent in Contact Center Pro takes overflow and after-hours calls, schedules against your ServiceTitan capacity and escalates to a live agent, per its feature page, checked 2026-10-18.
• Your jobs live in Jobber or Housecall Pro. Jobber Receptionist and Housecall Pro's CSR AI work from the account data in their own products, per Jobber and Housecall Pro, checked 2026-10-18.
• You want a person to take the overflow. No humans sit behind Anna. A human receptionist service, for example Smith.ai's human plans, which per its pricing page can take over a call at any hour (checked 2026-10-18), is the right tool when a live voice is the requirement.

Limits that decide it: VantaWeb does not write into ServiceTitan, Jobber, Housecall Pro or any CRM. Anna does not take Spanish-language calls. VantaWeb is not offered for healthcare practices and Anna does not handle PHI. VantaWeb has no missed-call text-back: a caller who hangs up during the ring gets no text from us.