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Carriers are retiring analog and POTS (Plain Old Telephone Service) lines across New York. If your building can't get new copper lines โ or the ones you have keep failing โ Callifi installs SIP trunks on your existing PBX so you keep your phones, your extensions, and your workflow. No rip-and-replace required.
For decades, NYC businesses connected their phone systems with analog trunk lines (POTS) delivered over copper wiring from the telephone company. Those copper lines are going away. Verizon, AT&T, and other carriers are actively decommissioning copper infrastructure, refusing new POTS line orders, and letting existing copper degrade without repair.
If you're running an Avaya, NEC, Nortel, Panasonic, Mitel, or Toshiba phone system on analog trunks, you may have already noticed: lines going dead for days, the carrier refusing to dispatch a tech, or being told "we can no longer provide service at this address."
The good news: your phone system doesn't have to go away just because copper lines do. SIP trunks deliver calls over your internet connection and plug directly into the same PBX you're already using.
SIP (Session Initiation Protocol) trunking replaces your physical analog lines with virtual phone lines delivered over your internet connection. Instead of copper wires from the telephone company, your PBX connects to a SIP trunk provider through your existing network โ same phone numbers, same extensions, same call routing, same phones on every desk.
Think of it this way: your PBX is the brain of your phone system. Analog trunks were the road connecting it to the outside world. SIP trunks are a new, better road โ the brain doesn't change, just the connection to the telephone network.
Your desk phones, conference phones, and all extensions stay exactly the same. Nobody needs training.
We port all your existing phone and fax numbers. Your clients call the same number they always have.
Your Avaya, NEC, Nortel, Panasonic, or Mitel PBX keeps running โ we just change what feeds it.
SIP trunks typically cost less per month than the analog lines they replace โ especially for businesses with many lines.
We install SIP trunks on virtually any legacy PBX that has a PRI, T1, or analog trunk card โ or we add a SIP gateway to convert SIP to the format your system expects. Here are the systems we work on most:
Even if your system isn't listed โ call us. If it has trunk ports, we can almost certainly connect SIP trunks to it.
We visit your office, inspect your PBX, check your trunk configuration, verify your internet bandwidth, and determine the best SIP trunk approach for your specific system.
If your PBX has native SIP trunk support (like Avaya IP Office or NEC SL2100), we configure it directly. If it's an older analog system (like Avaya Partner ACS or Panasonic KX-TDA), we install a SIP gateway that converts SIP to the analog or PRI signal your PBX expects.
We set up your SIP trunk service with the right number of channels for your call volume. We configure failover, caller ID, 911/E911 routing, and codec settings optimized for voice quality.
We port all your existing phone numbers from your current carrier to the SIP trunk provider. Same numbers, zero downtime โ your old lines keep working until the moment the port completes.
We test every line, every extension, inbound and outbound calls, fax, caller ID, voicemail, and 911. When everything passes, we cut over during a scheduled window with zero downtime.
After cutover, Callifi is your ongoing support contact for both the SIP trunks and your legacy PBX. One call handles everything.
SIP trunking is the right move if:
Your carrier won't provision new analog lines at your address, or existing lines keep failing with no repair ETA.
Your PBX and phones are healthy โ the only problem is the lines connecting them to the outside world. No reason to rip and replace.
SIP trunks typically cost 30-50% less per month than analog lines. Keep your same system, lower your bill.
Maybe you'll move to hosted VoIP eventually, but you have 2-3 good years left on your current PBX. SIP trunking buys that time.
And when you are ready to migrate to hosted VoIP, Callifi handles that too โ same team, same relationship. SIP trunking now doesn't lock you into anything.
Free on-site assessment. We'll inspect your PBX, test your internet, and give you an honest quote โ same day if you need it.
Get a Free AssessmentOr call (212) 423-1234 ยท get@callifi.com
