Before you start — you will need the details from your welcome email: SIP domain, username (usually your trunk or extension number), password, and the outbound proxy if one was issued. If you do not have them, contact support.
| Setting | Value |
|---|---|
| SIP domain / registrar | sip.sipandvoip.com.cy |
| Outbound proxy | sip.sipandvoip.com.cy |
| SIP port (UDP / TCP) | 5060 |
| SIP port (TLS) | 5061 |
| Transport | UDP, TCP or TLS |
| Codecs | G.711 A-law (alaw), G.729, OPUS |
| DTMF | RFC 2833 |
| Username / password | From your welcome email |
⚠ These are placeholder values — set the real ones in the editor (Global tab) and they update on every guide at once.
Set up your account
Open account setup
Launch Zoiper and go to Settings → Accounts → Add account. Choose Yes when asked whether you already have an account, then select Manual configuration → SIP.
Enter your credentials
Username: your SIP username. Password: your SIP password. Domain: your SIP domain. Leave Caller ID blank unless you have been given a specific value — the network sets it.
Set the outbound proxy
On the same screen, open Optional (or Network settings on mobile) and enter the outbound proxy. Set transport to UDP unless you have requested TLS, in which case choose TLS and port 5061.
Choose codecs
Under Codecs, enable G.711 A-law and OPUS. On a mobile data connection, move OPUS or G.729 to the top — they use materially less bandwidth than G.711.
Register
Save. The account should show a green tick and “Registered” within a few seconds. A red icon means the credentials or the domain are wrong, or a firewall is blocking SIP.
Enable push (mobile only)
On iOS and Android, turn on Push notifications in the account settings so incoming calls wake the app. Without it, calls only arrive while Zoiper is open in the foreground.
Dialling
Dial internal extensions by their number. For external calls, dial the full international number — +357…, +44… and so on. Zoiper's Dialplan tab can rewrite numbers automatically if your users are used to dialling 00 or a local format.
If it does not register
- 401 / 403 on REGISTER — username or password is wrong, or the device is presenting a different username in the auth header than in the From header. Check both.
- No response at all — a firewall is dropping SIP. Allow outbound UDP 5060 (or TCP/TLS 5061) and the RTP range to our network, and make sure any SIP ALG on the router is disabled. SIP ALG causes more problems than it solves.
- Registers, but one-way or no audio — almost always NAT. Set the external address on your PBX, forward or open the RTP port range, and confirm the device is advertising its public IP in SDP.
- Calls drop after ~30 seconds — SIP session timers or ACK not reaching us. Enable session timers and re-check NAT traversal settings.
- Outbound rejected with 404 — number format. Send E.164 with the leading
+or full international format without a trunk prefix.
Still stuck? Send us the SIP trace and we will look at it against our side of the call.