Configure Mitel 6900 series for VoiceTel.

Confirm SIP firmware

Press Settings → Status → Phone Info. The firmware version should be SIP- prefixed (e.g. 5.2.0.10000 with the SIP load). If it shows MiNet-, convert to SIP firmware first via Mitel's downloads area.

Web UI configuration

1. Find the IP address: Settings → Status → Network → IP Address.
2. Open http://<phone-ip>. Sign in (default admin / 22222 — change immediately).
3. Open Advanced Settings → Account Configuration → Line 1.
4. Set:
   • Line Mode: Generic
   • Screen Name: caller's name
   • Phone Number: SIP username from VoiceTel onboarding
   • Caller ID: caller's name
   • Authentication Name: SIP username
   • Password: SIP password
5. Open Advanced Settings → Network → SIP Server:
   • Configuration Server: the SIP server host shown in your customer portal (port 5060)
   • Backup Server: a backup VoiceTel host if your onboarding email lists one
   • Outbound Proxy: same as Configuration Server
   • Registration Period: 360
   • Transport: UDP
6. Open Advanced Settings → Audio → Audio Codecs. Arrange PCMU and PCMA at the top of the list.
7. Click Save Settings. The phone restarts the SIP stack and registers.

NAT & keepalive

Open Advanced Settings → Network → NAT Settings:

• NAT Refresh Interval: 30 seconds
• NAT Type: Static (or set Public IP if the phone has a public IP)

Auto-provisioning

Mitel SIP firmware fetches aastra.cfg (global) and <mac>.cfg (per-phone) at boot via TFTP, FTP, HTTP, or HTTPS. Configure Advanced Settings → Configuration Server → Download Protocol to point at your provisioning server. Contact VoiceTel engineering for a Mitel aastra.cfg template.