FreeVoIP runs on the open SIP standard, so almost any modern phone or app will work — a smart desk phone, a cordless handset, a free app on your mobile, or the analogue phone already on your desk. No proprietary hardware, no lock-in. Scroll down for setup samples covering IP phones, ATAs, softphones and PBX trunks.
Every option below needs just three things to connect — your user ID, password and our SIP proxy. Mix and match as many as you like.
Purpose-built SIP handsets from Yealink, Grandstream, Fanvil, Snom, Poly and Cisco. Plug into your network, enter your details and you have a full-featured office phone with lines, transfer, hold and speed dials.
Wireless SIP handsets and base stations — roam around the home or office while staying on your VoIP line. A single base can register several cordless handsets, each on its own free account.
Keep the analogue phone you already own. An ATA (Analogue Telephone Adapter) sits between your ordinary handset and your router, turning it into a VoIP line — ideal for reusing a much-loved deskphone or a DECT set.
Turn your Android or iPhone into a VoIP handset with a free softphone app such as Zoiper or Linphone. Take your number and low rates anywhere you have Wi-Fi or data — perfect for travel and remote work.
Make and take calls straight from your laptop, PC or Mac with a free softphone — MicroSIP, Zoiper or Linphone — using your headset or the built-in mic and speakers. No extra hardware needed.
SIP conference units for the meeting room, and PBX gateways or door-entry and paging devices for larger sites. If it speaks SIP, it works on the FreeVoIP network.
The exact fields differ slightly by make, but the values are always the same — your user ID, your password and our SIP server sip.transcom.net. The examples below use the account 158461_myoffice; swap in your own.
Yealink, Grandstream, Fanvil, Snom, Poly and Cisco phones — and Grandstream/Cisco ATAs for an analogue phone — all take the same account details in their web interface. Log into the phone’s IP address in a browser and open the account/line page.
| Field (varies by brand) | Value |
|---|---|
| Enable / Register line | On |
| Display / Label name | My Office |
| User ID / SIP User / Auth name | 158461_myoffice |
| Register name / Authenticate ID | 158461_myoffice |
| Password | your account password |
| SIP server / Registrar / Host | sip.transcom.net |
| Outbound proxy | sip.transcom.net |
| Port | 5060 (UDP) · 5061 for TLS |
| Codecs (in order) | PCMU / G.711u, G.729, G.722 |
Menu paths: Yealink Account → Register · Grandstream Accounts → General Settings · Fanvil Line → SIP · Snom Identity · Grandstream ATA FXS Port. One free account per line — add more accounts for more handsets.
Free apps like Zoiper, Linphone and MicroSIP take the same three details. Add a new SIP account and enter:
| Field | Value |
|---|---|
| Account name | FreeVoIP |
| Username / User ID | 158461_myoffice |
| Password | your account password |
| Domain / SIP server / Host | sip.transcom.net |
| Outbound proxy (if asked) | sip.transcom.net |
| Transport | UDP (or TLS) |
Zoiper: Settings → Accounts → Add → SIP, enter 158461_myoffice@sip.transcom.net and your password · Linphone: Assistant → Use a SIP account · MicroSIP: Menu → Add account.
Point your own PBX at FreeVoIP with a registering SIP trunk. In FreePBX go to Connectivity → Trunks → Add (pjsip); the same values apply to a raw Asterisk pjsip.conf or a 3CX generic SIP trunk.
| Trunk field | Value |
|---|---|
| Trunk / provider name | freevoip |
| Username / Auth ID | 158461_myoffice |
| Secret / Password | your account password |
| SIP server / Host / Registrar | sip.transcom.net |
| Port | 5060 |
| Transport | udp |
| Registration | Send (register) |
| Inbound context | from-trunk |
| Allowed codecs | ulaw, g729, g722 |
Legacy Asterisk chan_sip register string: 158461_myoffice:password@sip.transcom.net. In 3CX pick “Generic SIP Trunk” and set the registrar/outbound proxy to sip.transcom.net.
Because FreeVoIP is built on open standards, you’re never tied to one manufacturer or a single supplier’s hardware. Buy a phone once and it works with us today and with any other SIP provider tomorrow — the choice, and the number, stay yours.
Need more than one phone? Simply create a free account for each device or line — there’s no limit — and register them all to the same softphones, desk phones or cordless handsets. Add a DID or FreeFone number to any device, including a computer.
There are hundreds of SIP clients out there and many are completely free — any of them will work. Not sure which to pick, or which codec suits a slow connection? Just ask and we’ll recommend the best fit.
