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.
Blog
Read the latest Phone Guides articles about VoIP troubleshooting, deployments, firmware, security, and Australian telecommunications.
How to test SIP DNS SRV failover before an outage
Confirm that the PBX discovers, selects and recovers between SIP SRV targets without waiting for a carrier server to fail in production.
Ghost calls and phantom rings: prove what reached the phone
A phone that rings with no real caller may be receiving unsolicited SIP traffic, a PBX call or a local feature event. Capture the signalling before blocking blindly.
Australia’s new telco outage registers: what voice teams should use them for
Australian carriers must now publish registers for major and significant local outages. Here is where that information helps—and where it does not.
How to read phone firmware release notes before a rollout
Turn vague firmware notes into a safe phone rollout by checking prerequisites, fixed defects, known issues, rollback limits and PBX support.
What to send a carrier when escalating a call-quality fault
Give the carrier timestamps, direction, call identifiers and measured media evidence so an intermittent voice fault can be traced quickly.
Where is the call being transcoded? How to prove it
Compare SDP and RTP on both call legs to establish where a codec changes instead of guessing from a single SIP offer.
You can move from PRI to SIP without moving the PBX to the cloud
A carrier access migration and a PBX hosting migration are separate projects. Keep the existing PBX while replacing PRI with SIP when the boundaries support it.
Should a desk phone also act as a branch SBC?
Router phones can remove a separate branch appliance, but they also combine a user endpoint and a network dependency. Use this decision test.
Why a secondary DID rings briefly, then reaches carrier voicemail
When a secondary number rings an extension and then diverts to unexpected voicemail, the SIP call flow can identify which system took control.
When phone firmware causes no audio
New phones can register and complete calls yet pass no usable audio. Isolate a firmware fault before rebuilding the network around it.
VoIP migration planning: a staged cutover guide
Move from legacy telephony to VoIP with inventory, dependency mapping, pilot testing, staged cutover, rollback, and user support.