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Practical reception guide · By Yes AI

Connect an AI receptionist to a VoIP phone system

Published 5 min read

Divert codes work for a single mobile or landline, but many offices run a hosted PBX, 3CX or Microsoft Teams Phone with ring groups and queues. In those systems the AI receptionist becomes one more destination in the call flow. This guide explains where to attach it, what information has to travel with the call and how to test transfers back to your staff.

Quick answer

On a VoIP phone system, connect the AI receptionist as a destination inside your call flow instead of diverting the whole number. Point the ring group's no-answer rule, the queue's overflow or timeout rule, or the after-hours schedule at the receptionist's number or SIP address. Then confirm that the caller's number reaches it, that it can tell which of your numbers was dialled and that its transfers back to staff arrive as normal calls.

IT contractor configuring a desk phone and laptop beside a network cabinet in a small Melbourne office

Where in the call flow should the receptionist sit?

Start by listing every path a call can take through your system today, using the list below as a guide. Then pick the points where the receptionist takes over. Microsoft Teams call queues, for example, have separate exception settings for overflow (too many calls waiting), timeout (a caller has waited too long) and no agents signed in, and each can redirect calls to a different destination. Microsoft documents separate requirements for transferring calls to external numbers, so check those before choosing an external destination.

  • Auto attendant menu options
  • Each ring group and its no-answer rule
  • Each queue and its overflow, timeout and no-agent rules
  • Business hours, after-hours and holiday schedules

Should you forward to a number or connect over SIP?

Forwarding to an Australian phone number is the simplest option and works on any system that allows forwarding to external numbers. The trade-off is capacity: a forwarded call can occupy one inbound and one outbound channel on your trunk for its whole length, so check how many concurrent calls your plan allows. A direct SIP connection between your phone system and the receptionist platform avoids sending the call back out through your carrier, but it needs configuration on both sides and a provider that supports it. Ask your phone provider which options it offers before choosing.

How does the receptionist know which number was dialled?

If you have separate numbers for sales, service or each location, the receptionist needs to know which one the caller rang so it can greet them correctly and route the message. A plain forward may present only your main number or the receptionist's own number. SIP has headers for this: the Diversion header (RFC 5806) and History-Info (RFC 7044) both carry information about how a call was redirected. Ask your provider which one it sends, then confirm the receptionist reads it. If neither is available, give each of your numbers its own forwarding destination.

Will the caller's number come through?

The receptionist needs the caller's real number to recognise returning customers and to text confirmations. Some phone systems present the business's own number on forwarded calls instead of the original caller's. Find the setting that controls caller ID on forwarded or external calls, then make a test call from a mobile whose number you know. Also decide what happens when a caller withholds their number: the receptionist should ask for a callback number and read it back, because it cannot rely on caller ID for that call.

How do transfers back to staff work?

Transfers can work in two ways. With a SIP REFER, defined in RFC 3515, the receptionist asks the phone system to call the transfer target and is notified whether that worked. Alternatively, the receptionist places a new call to the staff member and bridges the two calls, staying on the line until someone answers. Whichever method is used, check where the transfer lands. Transferring to a ring group that overflows back to the receptionist creates a loop. Transferring to a mobile that sends unknown numbers to voicemail can make a failed transfer look like a success.

What should you test before switching it on?

Test each event you routed, one at a time, and record what the caller hears and what staff see. Let a ring group ring out. Fill a queue past its limit. Call outside hours and on a date in your holiday schedule. Call each of your numbers to confirm the receptionist knows which was dialled. Ring from a withheld number. Ask for a transfer while the staff member is busy, not answering and logged out. Finally, place several calls at the same time to check capacity, and confirm no route sends a transferred call back into the receptionist.

Where to attach an AI receptionist in common call flows

Call flow eventExample setting nameCalls that reach the receptionistWhat to test
Ring group not answeredNo-answer destination or ring timeoutCalls staff did not pick up in timeThe ring time gives staff a fair chance to answer
Queue overflowOverflow, or maximum calls in the queue (Teams)Callers beyond the queue limitThe limit is low enough to trigger in busy periods
Queue timeoutCall timeout or maximum wait time (Teams)Callers who waited past the limitThe greeting acknowledges the wait
Nobody signed inNo agents opted in or logged in (Teams)Calls when the queue is emptyStaff who forget to sign out do not leave calls ringing
After hours and holidaysTime-of-day or holiday scheduleAll calls outside business hoursThe year's holiday dates are loaded
Every callAuto attendant or first destinationAll inbound callsTransfers to staff do not loop back

Practical checklist

  • Each call-flow event that reaches the receptionist is recorded with its setting and value.
  • The receptionist receives the caller's number, not your own.
  • It can tell which of your numbers or locations the caller dialled.
  • Transfers back to staff were tested when the destination was busy, not answering and logged out.
  • No route sends a transferred call back into the receptionist.
  • Your trunk or plan has enough concurrent calls for forwarded calls in busy periods.

Common questions

Do we need to change phone providers?

Not if your current system can forward calls to an external number or route them to a SIP destination. Check with your provider or whoever manages your phone system. Changing providers is only worth considering if the system cannot forward externally or cannot pass the caller's number through to the receptionist.

Will forwarded calls show in our phone system reports?

Check how your system labels them. It records that the call left your system, not what happened next. Use the receptionist's call records for outcomes and your phone system's reports for volumes, and reconcile the two for the first few weeks so you can see any calls that went missing between them.

What about Microsoft Teams Phone?

Teams call queues can redirect calls on overflow, timeout and when no agents are signed in. Microsoft documents separate requirements for transferring calls to external numbers, so confirm your Teams setup meets them, or ask whether the receptionist provider can connect over a direct SIP route instead.

Will callers hear extra ringing?

They may hear your ring group ring first and then the receptionist answer. Keep the ring time short enough that callers do not give up, and test it from a mobile. If the receptionist answers every call first, there is no ring group delay at all.

What happens if our internet connection drops?

If your phone system is hosted in the cloud and the routing rules live there, calls can still reach the receptionist while your office is offline. An on-premises system that loses its connection may stop routing calls entirely. Ask your provider about failover destinations, such as forwarding to the receptionist when the office system is unreachable.

Sources and further reading

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