InstaCall SIP Trunking
SIP Trunking.
A smarter connection.
Connect your phone system to the people who matter. Flexible SIP trunking for your next stage of business.
Built around your business
01 Business voice connectivity
Your phone system.
More connected.
Bring inbound and outbound calling together with SIP connectivity that works with your compatible PBX.
- PBX connectivity
- Flexible call capacity
- Business numbers
Built around your business
Make more of
your phone system.
Build on what works.
Keep the familiar calling experience your team already knows, with an IP connection behind it.
Connect a legacy or IP PBX through a VoIP gateway, direct SIP trunk or API. Keep your existing hardware while replacing traditional phone lines.
Plan for your busy hours.
Match concurrent call capacity to the way your business actually works.
Scale call volume without capacity limits, with lower local and international calling rates.
Put your numbers to work.
Choose local, toll-free or vanity numbers—or discuss moving the ones customers already know.
Pair SIP with Cloud PBX and mix cloud-based seat types as your business grows.
A simpler connection
Your system.
Connected to the world.
SIP trunking links your PBX to the telephone network over an IP connection. Your PBX manages the team’s calls; the trunk carries them beyond your business.
Discuss Your Setup
Integration & compatibility
- Asterisk
- FreePBX
- 3CX
- Avaya
- Cisco
- Yeastar
- Mitel
Our Standard Trunk works with major PBX platforms, including modern IP PBX systems, legacy PBX systems and contact center software. Connect CRM and contact center applications through API/REST integrations.
Share your PBX model and version so we can confirm the right configuration.
SIP capabilities
More control.
Less complexity.
Bring the essentials into focus, from everyday calling to the details your IT team needs.
Everyday voice
- Two-way voice: inbound and outbound calls
- Direct Inward Dialing (DID) support
- Caller ID presentation: CLIP / CNAM
- Call forwarding and diversion
- Burstable channels for concurrent calls
- E.164 compliance for global numbering
Security controls
- TLS / SRTP encryption
- IP authentication: static or dynamic
- Digest authentication: username and password
- Call fraud detection and call rate throttling
- Allowlist and blocklist management
- Geofencing by country or prefix
Call continuity
- 99% SLA-backed uptime
- Automatic failover to backup gateways
- Load-balanced SIP proxy clusters
- Geo-redundant PoPs and redundancy routes
- QoS monitoring and call path optimization
- Session border controller (SBC) integration
- Dynamic routing based on call quality
- Disaster recovery routing / BCP
Useful call insights
- Real-time call dashboard and call detail records (CDR)
- Per-DID and per-department analytics
- Call completion and answer ratio reports
- Cost summaries by route and destination
- Exportable reports: CSV, PDF and API
- Automated billing integration
Flexible connectivity
- SIP over UDP, TCP or TLS
- Codecs: G.711 (A/U), G.729, Opus and G.722 (HD Voice)
- True fax with fax-to-email
- SMS over SIP
- Multi-tenant management for resellers and MSPs
Room to grow
- Software-defined trunks with real-time capacity increases or decreases
- Scale without new gateways, cards or racks
- One global trunk across locations and clouds
- Routing for HQ, branches, remote agents, data centers and UC platforms
Day-to-day management
One portal. Every location.
Manage phone services for multiple locations and teams from one dashboard, bringing SIP services and cloud phone systems together.
- Set up and manage call menus
- Add and manage users and extensions
- Manage call recordings and virtual fax
- Let each user edit individual phone preferences
Flexible pricing
Calling that fits your business.
- Pay for active call minutes or concurrent channels
- Volume-based discounts
- Flexible billing cycles
- Postpaid / prepaid hybrid support
- Competitive per-minute rates to 200+ destinations
Configuration, feature availability and commercial terms are confirmed for your deployment.
02 Your number. Your identity.
A new connection.
A familiar number.
Keep your business easy to reach. Explore number porting, build a local presence or choose a memorable toll-free or vanity number.
Plan your next step
A clear path
to getting connected.
Start with your current setup and the conversations your business needs to support.
Tell us about your setup
Bring your PBX details, expected call volume, key destinations and number requirements.
Map out the connection
Discuss capacity, routing, authentication and the right commercial options for your business.
Prepare for the switch
Agree on testing, number changes and a rollout plan before moving your business calls.
A few helpful answers
Let’s make
it clear.
Have a question about your own setup? Talk it through with our team.
Speak with an ExpertWhat does SIP trunking do?
It gives your business phone system a connection to external telephone networks over IP, so your team can make and receive calls without traditional phone lines.
Can I use my existing PBX?
A compatible IP PBX can connect directly. Some older systems need a VoIP gateway. Share your system’s model and software version to discuss the connection requirements.
Can I keep my current phone numbers?
Number porting may let you move eligible numbers to InstaCall. Our team can review your numbers and discuss availability, requirements and timing.
How much call capacity do I need?
Start with the highest number of calls you expect at the same time, then allow for growth. Your total employee count alone does not determine the capacity you need.
How is SIP trunking different from Cloud PBX?
SIP trunking supplies the external connection for a compatible phone system. Cloud PBX provides the hosted phone system itself, including extensions, routing and user tools. Explore InstaCall Cloud PBX if you need a complete phone system.
How is SIP trunking priced?
Pricing can be based on active call minutes or concurrent channels, with volume discounts, flexible billing cycles and postpaid / prepaid hybrid options. Share your expected call traffic and destinations so our team can discuss the right plan and rates.
What security options are available?
Options include TLS / SRTP encryption, IP or digest authentication, call fraud detection, rate throttling, allowlists and blocklists, and country or prefix restrictions. Our team can review the configuration that fits your PBX and network.
Your next connection starts here
Let’s connect your business
to what’s next.
Tell us about your phone system and calling needs. We’ll help you explore the right next step.
Scale your operations Cut your phone bill
Keep your existing hardware and ditch your landlines for more flexible and affordable VoIP SIP Trunk
Upgrade your phones
and save
Keep your PBX and Phone System
Connect your legacy or IP PBX using VoIP gateway, direct SIP trunk or API.
Connect With Ease
Our Standard Trunk works with any modern IP PBX system, contact center software, or legacy PBX system.
Save Big
No capacity limits on call volume. Enjoy lower local and international rates.
Your business phones. Now more connected.
The features you expect and more, with the ability to scale instantly.
Enjoy affordable local and
international call rates.
Choose from a range of local numbers, vanity numbers and toll-free numbers, easy number porting.
scale your business by pairing with our Cloud PBX solutions
Mix and match with other cloud-based seat types.
Painless portal management.
You can control your phone services across multiple locations and teams from a single, easy-to-use dashboard. The platform allows you to manage call menus, add and manage users, extensions, call recordings, and even virtual fax with ease. Whether you’re overseeing SIP services or b-hive cloud systems, everything can be managed together in the same unified portal. Each user also has the flexibility to edit their individual phone preferences to suit their needs.
Bring your business phones up to speed
Integration & Compatibility
Security
TLS/SRTP encryption
IP authentication (static or dynamic)
Digest authentication (username/password)
Call fraud detection & call rate throttling
Black/white list management
Geo-fencing (country or prefix blocking)
Product Features
Two-way voice connectivity (Inbound & Outbound)
DID (Direct Inward Dialing) support
Caller ID presentation (CLIP/CNAM)
Call forwarding / diversion
Concurrent call scalability (Burstable channels)
Codec support: G.711 (A/U), G.729, OPUS, G.722 (HD Voice)
SIP over UDP/TCP/TLS
Failover & redundancy routes
Geo-redundant PoPs for higher uptime
E.164 compliance for global
numbering
Local & Toll-free numbers.
Easy Number porting
Scalability
Elastic Scale & Multi-Site Collaboration
Scale up or down instantly—no new gateways, cards, or racks. SIP trunks are software-defined, so you can increase or decrease concurrent call capacity in real time.
One global trunk for all locations and clouds; route calls between HQ, branches, remote agents, data centers, and UC platforms seamlessly
Advanced Features
Compatible with all major PBX systems:
(Asterisk, FreePBX, 3CX, Avaya, Cisco, Yeastar, Mitel, etc.),
CRM and Contact Center integrations (API/REST)
True fax with fax-to-email,
SMS over SIP, and multi-
tenant management (for
resellers/MSPs).
Flexible Pricing
Pay only for active call minutes or concurrent channels
Volume-based discounts
Flexible billing cycles
Postpaid / prepaid hybrid support
Competitive per-minute rates to 200+ destinations
Analytics & Reporting
Real-time call dashboard
Per-DID / per-department analytics
Call completion & answer ratio reports
Cost summary by route / destination
Exportable reports (CSV, PDF, API)
Automated billing integration