Zoiper setup

Get your SIP endpoint creds first (overview).

Desktop (Windows / macOS)

1. Open Zoiper → Settings → Accounts → Add account.
2. Account type: SIP.
3. Fields:
   • Domain: your-acct.sip.suzko.net
   • Username: endpoint username
   • Password: endpoint password
   • Authentication username: same as username
   • Outbound proxy: leave blank
4. Transport: TLS (recommended) or UDP.
5. Save. Zoiper attempts registration.

Mobile (iOS / Android)

Same fields, different UI:

1. Settings → Accounts → Add account → Manual configuration
2. Pick SIP
3. Fill in the same fields above
4. Save

Verifying

Check the account list — green dot = registered. Tap your number and call any other phone (your cell) to verify outbound. Then call your Suzko number from your cell to verify inbound.

Common issues

• Stuck on "Connecting" — wrong domain or creds. Double-check against the SIP endpoint page in your Suzko dashboard.
• One-way audio — firewall blocking inbound RTP. Open UDP ports 10000–20000 inbound, or use TLS transport (we tunnel RTP through the SRTP/SIPS channel).
• No outbound — endpoint might not have outbound calling enabled. Check the endpoint settings in the dashboard.

Codec preferences

For best quality, set Zoiper's codec list (top of the audio preferences):

1. Opus
2. G.722
3. G.711 / PCMU

Drop iLBC and G.729 unless you specifically need them — they're old and lower-quality.