SIP TRUNKING

SIP trunking without the carrier drama.

Tier-1 direct routes. Elastic concurrent call scaling. STIR/SHAKEN attested. E911 included.

  • 99.999% UPTIME
  • TIER-1 DIRECT
  • ELASTIC CHANNELS
  • 70+ POPS
LIVE CALL ROUTING · GLOBAL
251
active calls
● TIER-1 DIRECT
Zero reseller hops
US-EAST▶▶ via IAD PoP ▶▶UK-LON
CALLER
IAD
DFW
SJC
YOUR PBX
MOS
4.41
LATENCY
48 ms
CODEC
G.711
STIR/SHAKEN
E911 Included
WHAT THE TRUNK DELIVERS

What the trunk actually delivers.

~/ softtop · trunk.config
● LIVE
$ softtop trunk inspect --verbose
--us-canadaunmetered✓ READY
--concurrent-capelastic✓ READY
--stir-shakenattested✓ READY
--e911every-address✓ READY
--intl-termination150-countries✓ READY
--cdr-exportrealtime✓ READY
✓ All systems nominal · 99.999% SLA_
NO FORKLIFT UPGRADE

Keep your PBX, replace your carrier.

Works with every major on-prem and cloud PBX including Asterisk, FreePBX, Cisco, 3CX, Avaya, and Mitel. No forklift upgrade. The trunk drops in over a weekend and your dial plan stays exactly the way your team remembers it. Or move to our hosted phone system when you're ready.

SOFTTOP SIP TRUNK
TIER-1 DIRECTLIVE
Asterisk
CONNECTED
FreePBX
CONNECTED
Cisco
CONNECTED
3CX
CONNECTED
Avaya
CONNECTED
Mitel
CONNECTED
24
Active channels
4.4
MOS score
99.999%
Uptime SLA
Drops in a weekend
STANDS UP TO AUDIT

Reliability that stands up to audit.

POP MESH · FAILOVER
● ROUTING NOW: IAD
IAD
SJC
DFW
LHR
FRA
NRT
health-check OK · packet-loss 0.00% · jitter 4ms
TIER-1
Tier-1 direct interconnects.
No reseller chain, no unexplained routing. Direct agreements with US Tier-1 carriers mean calls land where they should at the quality you expect. MOS scores stay above 4.3 on standard US pairs. Compare on our compare page.
FAILOVER
Automatic regional failover in under two seconds.
70+ global PoPs with sub-second health checks. A fiber cut in one region fails traffic to the next PoP automatically. Your call volume never feels the outage. See our SIP protocol documentation for failover details.
ELASTIC
Elastic channels without a carrier ticket.
Spikes during Black Friday, tax season, or a press moment scale the trunk instantly. No pre-provisioning, no capacity request, no ticket. Pay for what you used, bill clearly, move on.
BILLING & USAGE

Billing and usage data you can actually audit.

Raw CDR export to S3, SFTP, or a live warehouse connector every 15 minutes. Margin analysis, reseller reconciliation, and fraud detection run on current data, not last month's PDF. Per-destination breakout makes international billing disputes a five-minute lookup.

CDR STREAM · LIVE
● STREAMING
TIMESTAMPFROMTODURDESTCOST
08:42:12.394+14155550193+44207946011800:04:21GB · LON$0.018
08:42:11.118+18445550144+1305555017200:01:12US · MIA$0.000
08:42:09.802+12125550142+8135550123400:09:55JP · TYO$0.062
08:42:07.451+18335550104+1404555019500:00:48US · ATL$0.000
08:42:05.227+18885550162+49305550882100:11:03DE · BER$0.041
✓ exported to s3://billing/cdr · 15-min cycle
01
99.999%
Uptime SLA
02
4.3+
MOS · US pairs
03
<2 s
Failover time
04
70+
Global PoPs

USE CASES

Every team that runs voice infrastructure.

SIP trunking that fits how your business handles voice — from a single site to a global network.

Contact Centers

Elastic inbound channels that scale instantly with call volume, IVR integration, and full CDR reporting on every call.

Elastic channelsIVR integrationCDR reporting
Enterprise IT

Migrate off legacy PBX lines to cloud SIP trunks without hardware — multi-site connectivity and built-in disaster recovery.

PBX migrationMulti-siteDisaster recovery
MSPs & Resellers

Multi-tenant SIP trunking with white-label provisioning and an API to manage numbers and channels per customer account.

Multi-tenantWhite-labelProvisioning API
Hospitality

Hotel PBX connectivity, guest room phone lines, and conference bridge trunks — all managed from one dashboard.

Hotel PBXGuest linesConference bridges
Healthcare

HIPAA-compliant voice trunks for patient callback lines, clinical communications, and after-hours routing.

HIPAA-compliantPatient callbacksClinical lines
Finance & Trading

Low-latency dealing room lines with compliance-grade call recording and the redundancy trading desks require.

Low latencyCompliance recordingRedundancy

From our customers

SIP trunking, on Softtop.

Tier-1 reliability, elastic channels, audit-grade CDRs — what they see.

<2 s
Failover · zero drops

"Our SIP trunks failed over during a regional fiber cut and no customer-facing call dropped. We found out from the post-mortem, not from a complaint."

J
James O&apos;Brien
IT Director, Parkside Financial
FAQ

Questions, answered.

PBX compatibility, pricing, E911, fraud, international — the common ones.

Yes. Certified with Asterisk, FreePBX, Cisco, 3CX, Avaya, Mitel, and every major SIP-compliant system. Our onboarding team runs interop testing before cutover.
Plan details on /pricing. Unmetered US and Canada bundles with transparent per-minute international rates. No per-channel lock-in.
Yes. E911 is included for every registered US address with automatic location updates for remote and traveling users.
Yes. Real-time anomaly detection on destination and velocity. Configurable spending caps per trunk. Alerts via email, webhook, or SIEM.
Tier-1 coverage across 150+ countries with published per-destination rates. No hidden surcharges, no opaque markups. Pair with global numbers for a full international presence.
Yes. US number porting is handled by our onboarding team and typically completes in 5–10 business days with zero downtime cutover.

SIP trunking without the carrier drama.

14-day free trial. No credit card required.