Office Phone Troubleshooting: Check Cables, Network and Config Before Blaming the PBX

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Office phone problems are often blamed on the PBX, but the cause is frequently simpler, such as a faulty cable, a network change, incorrect VLAN settings, or a stopped SIP trunk. The author recommends first identifying whether one extension or the whole office is affected, which quickly narrows the search. Basic physical checks come next, including cabling, switch port status, power and PoE, and whether the phone has a valid IP address and gateway. For SIP registration failures, common culprits include wrong credentials, incorrect PBX addresses, VLAN misconfiguration, DNS or routing issues, and firewalls blocking traffic. When calls connect but audio is one-way, the article points to RTP media path problems such as firewall rules, NAT settings, and routing.

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