Check codec settings before changing a call path
Review codec support, packet timing and bandwidth assumptions before changing a voice service.
Blog
Read the latest Phone Guides articles about VoIP troubleshooting, deployments, firmware, security, and Australian telecommunications.
Review international dial routes and destination controls
Check international prefix rules, carrier permissions and recent call records against the approved dial plan.
Trace an international call that fails or reaches the wrong number
Compare dialled digits, rewritten digits and carrier responses to diagnose an international calling fault.
Check an international dialling change against real routes
Test prefix stripping, country codes and caller ID before changing an international dial plan.
Review addressing and name resolution for voice devices
Check whether voice VLAN, DHCP, DNS and route records still match the working network.
Collect network evidence when phones lose service
Compare a failing phone with a working one across addressing, name resolution, routing and call traffic.
Check the voice network before an IP change
Record addressing, VLAN, DHCP, DNS and routing dependencies before changing a voice network.
What SIP 481 really means—and why a BYE can receive it
A SIP 481 response means the recipient cannot match a request to the dialog or transaction it expects. Use headers, timing and both call legs to find out why.
A 30-minute monthly audit for VoIP documentation
Use a short monthly audit to catch stale carrier contacts, number routes, firmware standards, recovery steps and undocumented phone-system changes.
Why a SIP call drops after about 30 seconds
A repeatable drop near 30 seconds often points to a missing ACK or response-routing problem. Follow the transaction before changing session timers.
What Australia’s 3G shutdown teaches business voice teams
Australia’s completed 3G transition exposed a broader lesson: network compatibility and emergency-call capability must be tested separately.
Replacing an end-of-sale desk phone: check more than the nearest model number
An end-of-sale notice starts a lifecycle decision. Compare support dates, platform approval, accessories, provisioning and recovery before choosing a replacement.