A VoIP cutover is not finished when the new phones light up. It is finished when Monday morning calls come in, go out and land at the right desks, and that ending is decided the week before.
Number porting is the critical path. Existing numbers have to move cleanly to the new system, and confirmation of that move belongs before the weekend, not during it. A phone system that works perfectly but answers on the wrong number, or not at all, has failed at the only job that counts.
Phones are placed, labelled and configured ahead of time, with extensions, voicemail and call routing set for how each team actually works. Then every extension is tested with real calls, in and out, because a directory that looks right on a screen can still route a call to the wrong chair.
Monday morning is the real go-live. The weekend is only rehearsal.
On Monday, support should be present and watching the first hours as a live event: the main number, the busiest desks, transfers and voicemail all checked while the office finds its rhythm. Small fixes made in that window stop small faults from becoming the reason staff stop trusting the new phones.
That is the playbook behind business phone system cutovers at KSPACE TECHNOLOGIES: porting confirmed early, every extension tested, and the first working morning staffed like a launch.
Takeaway: confirm the porting before the weekend, test every extension with real calls, and treat Monday as go-live. Phones earn trust on the first busy morning.