SSIPMASTER
Prepaid SIP trunking

Dial tone,
billed by the second.

Carrier-grade SIP trunks you can point any dialer at. Load a balance, verify your caller ID, and start dialing in minutes.

No minimums · No monthly fee · Verified caller ID required

trunk · live
sip.sipmaster.io:5061/tls
REG sip_a1b2c3d4e5f6@sip.sipmaster.io
registered
TIMEDESTINATIONDURCOSTstate
00:41+1 703 555 014202:13$0.019
00:39+44 20 7946 091300:48$0.012
00:37+1 312 555 889004:02$0.036
00:35+1 415 555 017700:00
00:34+52 55 1234 998101:27$0.021
BAL $128.40
channels 2/2 · today $14.82

Live in three steps

01

Load your balance

Top up with crypto. No contracts, no minimums, no monthly fees.

02

Get your credentials

Verify a caller ID and we generate your SIP username and password instantly.

03

Point your dialer

Drop the credentials into MicroSIP or any softphone and start dialing.

Built like a switch, priced like a prepaid card

Per-second billing

Every call is rated to the second against your prepaid balance. No rounding up to the minute.

Verified caller ID

Prove you control a number, then present it on outbound calls — better answer rates, fully compliant.

Bring your own dialer

Standard SIP credentials work with MicroSIP, Zoiper, or any softphone. Manual routes, your rules.

Hard balance cutoff

When your wallet hits zero, outbound stops mid-stream. You can never overspend.

Crypto top-ups

Fund your wallet with Bitcoin or stablecoins. Instant, irreversible, no chargebacks.

Live call records

Every completed call writes a CDR you can filter and export to CSV in seconds.

Transparent per-minute rates

What you see is what you pay. Rates are applied by longest-prefix match and billed against your wallet the moment a call ends.

US (+1) calling only — all other international routes are temporarily down.

See full rate sheet
DestinationPrefix/min
United States+1$0.0270

Ready to route your first call?

Create an account, verify your number, and load a balance. The trunk is waiting.

Get started