https://www.ipphonefactory.com/blog/ Engineering notes on sizing, cabling, codecs and handover for IP PBX, SIP phone, intercom and nurse call projects. en Sat, 10 Oct 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/fax-over-ip-t38-vs-g711-passthrough/ https://www.ipphonefactory.com/blog/fax-over-ip-t38-vs-g711-passthrough/ Why fax fails on a working voice call, which of the two modes fits which line, the speed defaults that matter, and how to number the fax extension. Wed, 05 Aug 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/poe-planning-for-a-floor-of-sip-phones/ https://www.ipphonefactory.com/blog/poe-planning-for-a-floor-of-sip-phones/ Which models state PoE and which do not, where the published consumption figures sit, how to size the switch, and why port speed matters too. Wed, 15 Jul 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/nat-stun-and-remote-extensions/ https://www.ipphonefactory.com/blog/nat-stun-and-remote-extensions/ What breaks when a phone or the PBX sits behind NAT, the punch-through and port-mapping routes, and the two headers that fix one-way audio. Wed, 01 Jul 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/from-enquiry-to-acceptance-ip-telephony-project/ https://www.ipphonefactory.com/blog/from-enquiry-to-acceptance-ip-telephony-project/ The five answers an enquiry needs, the design pack that turns them into a bill of materials, and the commissioning tests that decide acceptance. Tue, 23 Jun 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/ip-public-address-zones-multicast-priority/ https://www.ipphonefactory.com/blog/ip-public-address-zones-multicast-priority/ How a zone works on a SIP public-address system, how priority is decided, which speaker suits which space, and how legacy speaker lines cross over. Wed, 17 Jun 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/wired-vs-wireless-nurse-call/ https://www.ipphonefactory.com/blog/wired-vs-wireless-nurse-call/ A 2 m pull cord, a 6 to 25 m radio link, an IP65 button with a battery and an IP44 button with none. How to decide per position instead of per building. Tue, 09 Jun 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/codecs-explained-g711-g729-g722/ https://www.ipphonefactory.com/blog/codecs-explained-g711-g729-g722/ What each codec on the PBX media page is for, where wideband helps, why recording supports only two of them, and the voicemail file names that follow. Wed, 03 Jun 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/migrating-from-an-older-pbx-to-ip/ https://www.ipphonefactory.com/blog/migrating-from-an-older-pbx-to-ip/ The inventory that decides the migration, the numbering decision, the line strategy that keeps calls flowing, and five cutover phases with rollback. Tue, 26 May 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/dect-wifi-handsets-or-desk-phones/ https://www.ipphonefactory.com/blog/dect-wifi-handsets-or-desk-phones/ Coverage, capacity and battery figures for the three endpoint families, plus the cases where a fixed desk phone beats anything portable. Wed, 20 May 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/ip-pbx-epabx-pabx-difference/ https://www.ipphonefactory.com/blog/ip-pbx-epabx-pabx-difference/ Three names for one function, and one is regional. What a modern private exchange publishes, how the old expectations map onto it, and what to brief. Tue, 12 May 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/designing-an-auto-attendant-and-ivr-call-flow/ https://www.ipphonefactory.com/blog/designing-an-auto-attendant-and-ivr-call-flow/ Prompts, levels, time-of-day routing and the queue behind the operator position: how to lay out an IVR and what to test before the number goes live. Wed, 06 May 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/fxs-fxo-and-voip-gateways-explained/ https://www.ipphonefactory.com/blog/fxs-fxo-and-voip-gateways-explained/ Two port names, two opposite directions. How to read a site device by device, when analog ports belong on the PBX and when a small gateway is cheaper. Tue, 28 Apr 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/nurse-call-system-design-for-a-ward/ https://www.ipphonefactory.com/blog/nurse-call-system-design-for-a-ward/ A ward design method that starts from positions rather than devices: bedside and door-side stations, pull cords, corridor lights and the escalation path. Wed, 22 Apr 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/two-wire-retrofit-for-ip-phones/ https://www.ipphonefactory.com/blog/two-wire-retrofit-for-ip-phones/ A converter or a switch puts network and power onto the pair already in the wall. The published distances that rule options in and out. Tue, 14 Apr 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/sip-trunks-vs-analog-lines/ https://www.ipphonefactory.com/blog/sip-trunks-vs-analog-lines/ Cabling, failover and debugging all differ between a SIP trunk and an FXO line. A side-by-side comparison, plus the escape route that keeps calls flowing. Wed, 08 Apr 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/door-intercom-door-release-wiring/ https://www.ipphonefactory.com/blog/door-intercom-door-release-wiring/ What actually opens the door, what a built-in relay can and cannot tell you, fail-safe against fail-secure, and the tests to run before handover. Tue, 31 Mar 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/hotel-phone-system-wake-up-calls-and-pms/ https://www.ipphonefactory.com/blog/hotel-phone-system-wake-up-calls-and-pms/ What a hotel PBX has to do beyond dialling: service keys on the room phone, wake-up prompts, room status in the PMS and call permission by room class. Thu, 26 Mar 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/elevator-intercom-requirements-and-wiring/ https://www.ipphonefactory.com/blog/elevator-intercom-requirements-and-wiring/ An elevator intercom is a chain, not a device. Which positions the material names, why the travelling cable decides the design, and what to survey. Tue, 17 Mar 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/sizing-an-ip-pbx-for-a-building/ https://www.ipphonefactory.com/blog/sizing-an-ip-pbx-for-a-building/ The manual publishes trunks, not extensions. How to turn a headcount and a busy hour into a model number, with the full ladder of five models. Thu, 12 Mar 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/adding-office-intercom-to-an-existing-phone-system/ https://www.ipphonefactory.com/blog/adding-office-intercom-to-an-existing-phone-system/ Door stations and paging speakers are more SIP extensions, not a second system. Four capacity checks, the power question at the door, and a phased way in. Tue, 03 Mar 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/nurse-call-device-ratio-by-bed-count/ https://www.ipphonefactory.com/blog/nurse-call-device-ratio-by-bed-count/ Bedside station, pull cord, corridor light, portable handset: four ratios, four denominators, and the two printed plans that show how they diverge. Wed, 18 Feb 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/hospital-phone-system-compliance-checklist/ https://www.ipphonefactory.com/blog/hospital-phone-system-compliance-checklist/ What the product documentation states, what it does not record, and the questions your compliance officer must answer against local code. Wed, 04 Feb 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/100-room-hotel-phone-system-checklist/ https://www.ipphonefactory.com/blog/100-room-hotel-phone-system-checklist/ Room phones, second positions, staff desks, the analog ports a hotel always uses and the switches that power them - a 100-room list from published capacities. Wed, 21 Jan 2026 00:00:00 GMT https://www.ipphonefactory.com/blog/hotel-guest-phone-line-count/ https://www.ipphonefactory.com/blog/hotel-guest-phone-line-count/ Every guest handset in this range that states a line count states two. What that second line is for, when one number is enough, and where a position needs four. Wed, 14 Jan 2026 00:00:00 GMT