Softphone Conference Calls: Merge, Swap and Split
Tom Reed · Updated 6 November 2026
A softphone conference call is an ad-hoc multi-party call you build from the app: host up to six participants, then merge separate calls into one, swap between active calls, or split someone back onto their own line. Use it for quick work calls; use a hosted PBX bridge when guests need a dial-in number and PIN.
This guide is for teams who start conferences from the softphone rather than a dial-in bridge, whether they are on Windows, macOS, iOS or Android. It explains what six-way conferencing means, what merge, swap and split do, when a PBX bridge is still the better tool, and how to run a clean ad-hoc conference from the app. It links the hosted-PBX bridge guide once and does not rebuild that setup.
What is a softphone conference call (and how is it different from a PBX conference bridge)?
A softphone conference call is built in the moment from ordinary calls. You are already talking to someone, you need a third person, or you have two live calls and need everyone on one line. The conference lives on the device that started it, and the people on it are whoever you dialled or merged in.
A PBX conference bridge is different. Guests dial a number, enter a PIN and join a meet-me room that the phone system hosts. That pattern suits scheduled meetings and external guests who should not depend on your handset staying online. Our guide to conference calling for small business covers PBX bridges and meet-me setup. This post stays on the in-app side: the business softphone with 6-way conferencing.
If you are still choosing which softphone features matter day to day, our tour of softphone features every business needs places conferencing alongside hold, transfer and the rest. Here we go deeper on the conference controls themselves.
What does 6-way conferencing mean on the softphone?
Six-way conferencing means you can host a multi-party call with up to six participants. That is the cap shown on SessionTalk's softphones page: host conference calls with up to six participants, then merge, swap and split calls with the call-management controls.
On desktop the same ceiling appears with line capacity. The Windows and Mac desktop softphone with 6-way conferencing handles six concurrent lines with six-way conferencing, alongside attended and blind transfers, call forwarding and real-time Busy Lamp Field monitoring. Do not invent a larger conference size than six; when you need more people on a dial-in, use a PBX bridge instead.
Six participants is enough for a customer plus two specialists, a small project huddle or a quick escalation call. It is not a webinar room and it is not a scheduled all-hands. Keep the tool matched to the job.
What do merge, swap and split do?
Merge, swap and split are the three controls that reshape an ad-hoc conference without ending the calls you already have. Desktop softphones also manage holds, transfers and forwarding alongside those three; use hold, transfer and forward deliberately mid-conference so you do not drop the main call by accident.
Table: merge, swap and split (what each control is for)
| Control | What it does | Typical use |
|---|---|---|
| Merge | Joins separate active calls into one conference | Customer on line 1, specialist on line 2 → one three-way |
| Swap | Moves your attention between active calls without ending them | Hold the conference while you take a short side call, then return |
| Split | Pulls a participant (or a call) back out of the conference onto its own line | Remove a private side conversation without ending the main call |
| 6-way conference | Hosts a multi-party call with up to 6 participants | Small team huddle or customer + two specialists |
In plain words:
- Merge turns two (or more) separate live calls into one conversation. The classic case is a customer on line one and a specialist on line two: merge them so everyone can talk together.
- Swap moves you between active calls without hanging either up. Useful when the conference needs to wait while you take a short private call, then you return.
- Split pulls a participant or a call back out of the conference onto its own line. Use it when two people need a private aside and the rest of the conference should keep going.
Those controls sit next to the holds, transfers and forwarding you already use on desk phones. The difference is that they are built for reshaping a live multi-party call, not only for parking a single caller.
A practical habit is to announce each change. Say you are about to merge before you do it, say when you swap away, and say when you split someone out. People on the call hear silence differently from how you hear it on your headset, and a one-line announcement prevents the "did we lose them?" moment.
When should you conference from the softphone vs a PBX bridge?
Use the softphone when the conference is ad-hoc and small:
- You are already on a call and need to add a specialist mid-conversation
- You have two live customer or vendor calls and need to join them
- A small internal huddle of three to six people is enough
- Nobody needs a dial-in number or a PIN
Use a hosted PBX conference bridge when:
- Guests need a dial-in number and a PIN
- The meeting is scheduled or recurring
- You want bridge controls, recording or routing that live on the PBX side
The softphone path is faster for day-to-day work. The bridge path is cleaner when people outside your company must join without depending on your device.
Another way to decide: if the meeting exists only because you are already on a call, start from the softphone. If the meeting exists on the calendar before anyone dials, start from a bridge. Mixing the two mid-call is possible, but it usually creates more confusion than it saves. Details for bridges stay in the conference-calling guide linked above; do not rebuild that setup here.
How do you run a clean ad-hoc conference from the app?
A clean conference is mostly etiquette and order, not special hardware. Confirm audio first, add people one at a time, and tell the first caller before you merge someone in. Keep the conference under six participants; for larger dial-ins, switch to a PBX bridge.
Checklist: before you start an ad-hoc softphone conference
- Confirm headset or speaker is selected and levels are sane (especially on desktop)
- Know whether you will add people by dialling out or by merging an existing second call
- Tell the first caller you are about to add someone before you merge
- Add one participant at a time and check they can hear everyone
- Keep the conference under six participants; for larger dial-ins use a PBX bridge
- If you need hold, transfer or forward mid-call, use those controls deliberately so you don't drop the conference
- After the call, note whether a recurring dial-in bridge would have been simpler next time
Before a wider rollout, walk staff through the controls on a quiet day. Pair that practice with the rest of your softphone setup checklist so audio devices, accounts and notifications are already solid before anyone tries a six-way call with a customer on the line.
Pay special attention to headset selection on shared desktops. A conference that starts on laptop speakers and then jumps to a headset mid-call is a common source of echo complaints. Confirm the device before the first merge, not after the third person has joined.
Pair it with a hosted PBX
Pair it with a hosted PBX when you need dial-in bridges, routing and extensions managed with the same softphones: SessionPBX hosted PBX. SessionPBX doesn't supply numbers or lines: it is a bring-your-own SIP trunk system, so you connect the SIP trunk you already use for outside calls, and staff still run the softphones covered above.
FAQ
How many people can join a softphone conference call?
SessionTalk softphones support 6-way conferencing: up to 6 participants. That cap is the same idea on mobile and on the Windows and Mac desktop softphone. For larger or dial-in meetings, use a hosted PBX conference bridge instead of stretching the in-app conference.
What does merge mean on a softphone?
Merge joins separate active calls into one conference so everyone can talk together. A common pattern is a customer on one line and a specialist on another: merge them into a three-way without hanging up either call first.
What is the difference between swap and split?
Swap moves your attention between active calls without ending them, so you can step away to a side call and return. Split pulls a call or participant back out of the conference onto its own line, which is useful for a private aside while the main conference continues.
Can I run conferences from desktop as well as mobile?
Yes. The Windows and Mac desktop softphone includes 6-way conferencing with merge, swap and split alongside holds, transfers and forwarding. Mobile softphones also support 6-way conferencing with the same merge, swap and split idea for ad-hoc work calls.
When should I use a hosted PBX conference bridge instead?
Use a hosted PBX bridge when guests need a dial-in number and PIN, the meeting is scheduled or recurring, or you need PBX-side bridge controls. The conference-calling guide covers that setup; keep the softphone for quick ad-hoc conferences of up to six people.
