PBX version: all
Trunk Type: SIP registration
1.Extension/SIP trunk registration failure caused by the firewall
Symptom：Internally registration status always stuck in Registering or Register Failed.
Solution: Remove the IP address of phone from Blocked IP Address.
2. Improper port map on router
Symptom: Remote SIP registration failed.
Solution: Make sure the SIP port you map on router is proper. The default SIP port for PBX is 5060 by default.
3. The option Qualify has been disabled
Symptom: Remote extension try to register the PBX but get failure.
Solution: Enable the option Qualify on Edit Extension page.
4. NAT and Register Remotely option
Symptom: The registration status on IP phone is registered, but on PBX side is not.
Solution: Enable the NAT and Register Remotely option on Edit Extension page.
More checklist for SIP registration failure: