For business / Platform / Number porting
Keep the number,
change only the carrier that manages it
The main and direct numbers customers dial do not change. Once ZeroCall becomes the carrier that manages them, the call-forwarding leg and its charges disappear.
Facilities-based carrier reg. no. 1-01-25-0027 · ZeroCall handles porting itself
The number customers dial02-XXXX-1234Number unchanged
NowCurrent carrierPassed on by call forwarding
After portingZeroCallReceived directly by our switch
Main numberUnchanged
Direct numbersPorted after range check
Forwarding chargesKRW 0
DIFFERENCE
How call forwarding and number porting differ
Call forwardingIncoming calls are redialed to another number
Number portingThe managing carrier of the number changes
Number customers dialUnchangedUnchanged
Who manages the numberCurrent carrierZeroCall (facilities-based carrier)
Path of incoming callsCarrier → forwarding number → deskZeroCall switch → desk
Charges on incoming callsOutgoing charges on every forwarding legNo forwarding leg, so no charge
Physical carrier linesMust be keptCan be cancelled, saving the base fee too
Adding concurrent callsAdd lines and equipmentAdjusted in ZeroCall settings
SAFE SWITCH
We verify twice, then port
Stages 1 and 2 use the same technical setup; only the location of the number differs. Once Stage 1 is stable, Stage 2 is simply moving the number.
Stage 0 · Technical checkTest the integration with a test numberWe check the PBX integration on a test number kept separate from real customer calls.
Tester→Test 070 number→ZeroCall switch→Existing PBX and phones
No effect on customer callsStage 1 · Live call checkVerify with real calls via call forwardingThe main number at your current carrier is forwarded to the test number, so we verify with real customer calls.
Customer→Main number at current carrierForwarding→ZeroCall switch→Existing phones
Existing lines kept · billing structure unchangedStage 2 · Number portingPort the main number to ZeroCallSame setup as Stage 1; only the number moves. The call-forwarding leg disappears.
Customer→Ported main number→ZeroCall switch→Existing phones
KRW 0 forwarding charges · physical lines can be cancelledAfter Stage 2ZeroCall sends the porting request to your current carrier→The switch date is agreed and shared in advance→Switch with no interruption, then cancel the old physical lines
Stages 0 and 1 run with your existing lines and forwarding settings left as they are. If the integration fails, the phones you use today keep working, and incoming calls are not interrupted during the Stage 2 switch either. Carrier billing stays the same at these stages; savings begin after Stage 2.
CHECKLIST
What we check before porting
ZeroCall checks these with you during the review. If your team knows them in advance, the schedule moves faster.
01Number rangesDepending on the carrier, direct numbers attached to a main number may have to move together as a block. We first list the numbers to be ported.Owner · You and ZeroCall
02Current line typeThe porting path depends on whether the line is a regular landline, 070 (Korean internet phone prefix) or another internet phone line. We check it from your call logs and bills.Owner · ZeroCall
03PBX and phonesWe decide whether to keep your PBX or switch to SIP or PC phones. Whether the PBX can be integrated is checked at Stage 0.Owner · ZeroCall
04Current carrier contractWe check the commitment period and cancellation terms of your existing lines. If there is a cancellation fee, the porting date can be adjusted.Owner · You
FAQ
More about number porting
Yes. The numbers do not change; only the carrier that manages them does. Depending on the carrier, direct numbers may be ported together as a block, so we check the number ranges first.
DIAGNOSISFirst, whether you can port
and which path fitsSend us your call logs and phone bills, and we will tell you within one or two days whether porting is possible and which path to take.Request a free reviewRelated pages
and which path fitsSend us your call logs and phone bills, and we will tell you within one or two days whether porting is possible and which path to take.Request a free reviewRelated pages