Troubleshooting IP phones

Most IP phone issues fall into one of four buckets.

Phone won't register

• Wrong SIP password — check Extension → Security → SIP in Dromlik.
• TLS required but the phone is set to UDP.
• Firewall blocking outbound port 5061 (TLS) or the RTP range.

One-way audio

• NAT — enable rport and STUN on the phone, or put the phone behind a SIP-aware router.
• RTP port range blocked between the phone and Dromlik.

Auto provisioning doesn't apply

• Phone isn't factory-fresh — reset it (see Factory reset).
• MAC address wrong in Dromlik. Compare the MAC on the phone's screen with the one you entered.
• Time is wrong on the phone (TLS certificate validation fails). Enable NTP.

Random reboots

• PoE switch port is under-powered. Try a wall PSU.
• Old firmware — upgrade to the current stable release.