SIP Trunking
Carrier-grade SIP for any IP-PBX
Cut your phone bill, gain HD voice quality and add capacity in minutes. Our SIP trunks connect to any modern IP-PBX or session border controller with built-in failover and 24/7 monitoring.
Reliable SIP, ready to scale
Blue Sky operates a redundant, geographically distributed SIP network engineered for sub-second failover. Trunks deliver crystal-clear G.722 HD voice and support fax over T.38 for legacy needs.
Bring your own PBX or let us recommend one — we’ll provision DIDs, e911 and toll-free in any US market.
- Unlimited concurrent calls and burstable channels
- Local DIDs in 50 states + international numbers
- TLS/SRTP encryption end-to-end
- Free e911 registration and validation
- Real-time portal for usage and CDRs
- 24/7 NOC monitoring and proactive alerts
What you get
Built for modern businesses
01
HD Voice
G.722 wideband audio for natural-sounding conversations.
02
Instant scaling
Add channels, numbers or capacity in seconds — no contracts.
03
Geo-redundant
Active/active routing across multiple data centers.
01
Compliance-ready
STIR/SHAKEN signing and full e911 support.
02
Detailed CDRs
Real-time reporting and downloadable call detail records.
03
Engineer support
Talk to a real voice engineer, not a call center script.
How it works
A simple, proven process
01
Audit
We review your PBX, codecs and current call patterns.
02
Provision
Trunks, DIDs and e911 are activated in our portal.
03
Test
We run guided test calls to validate routing and quality.
04
Cutover
Phased porting moves traffic with zero downtime.
FAQs
Frequently asked questions
Have more questions? Our team is happy to walk you through how Blue Sky can fit your business.
Yes — our trunks are compatible with FreePBX, 3CX, Asterisk, Cisco, Avaya, Mitel and any standards-based SIP system.
Choose channel-based bundles or pure metered per-minute pricing. No long-term contracts and transparent rates.
Yes, T.38 fax-over-IP is fully supported on every trunk.
E911 registration and validation are included free for every DID.
All outbound calls are signed for caller-ID authentication and STIR/SHAKEN compliance.