Connect your PBX
Point your IP-PBX or Cloud PABX to Boxis SIP endpoints with TLS where supported.
SIP Trunk Connectivity
Connect Your PBX to the Public Telephone Network
Boxis SIP Trunk connects your private branch exchange (PBX) to the public telephone network via VoIP. Reliable, scalable, and cost-effective connectivity for businesses of all sizes with support for multiple protocols and advanced features.
Benefit from flexible pricing, up to 4000 concurrent calls per dedicated 1Gb/s uplinks, and seamless integration with your existing telephony infrastructure. Support for multiple codecs, failover mechanisms, and advanced features. Starting from competitive rates with transparent pricing.
Why choose Boxis SIP Trunk?
-
Scalability
SIP Protocol Support
Full support for Session Initiation Protocol (SIP) with comprehensive compatibility for SIP-based PBX systems and VoIP equipment.
-
Protocols
SIP & SIPS (TLS)
Secure SIP signalling over TLS (SIPS) alongside standard SIP — encrypted trunk registration and call setup for business PBX platforms.
-
Reliability
High availability infrastructure
Built on redundant Swiss infrastructure with a 99.9% uptime target — your trunks stay reachable for business-critical voice.
How SIP Trunk works
Connect your PBX to Boxis, provision channels, and place calls on the public network.
Size your channels
Choose concurrent call capacity that matches peak traffic — scale up without hardware swaps.
Call the public network
Place and receive PSTN calls with DIDs, failover options and usage visibility.
Technical checklist
- SIP / SIPS (TLS) compatibility
- TLS signalling encryption
- Multiple codec support
- Up to 4000 concurrent calls / 1 Gb/s uplink
- Failover & high availability
- Call statistics & monitoring
Transparent and Competitive Pricing
Pay-as-you-go per second, or unlimited fair-use call packs per channel (Swiss Business Pack model).
Channel from 2 CHF excl. VAT/mo on 24 months (−36 %) · Fair-use packs flat · Prices excl. VAT
SIP Trunk — Per second
Pay only what you use
From
2
CHF
excl. VAT /channel /mo
Outbound per second · Inbound included
- Multi-SBC redundancy / DNS SRV
- IP auth or REGISTER
- 1 DID included
Ideal when traffic is low or irregular.
Configure →Fair-use — Switzerland
Unlimited CH fixed & mobile (fair-use)
From
24
CHF
excl. VAT /channel /mo
Channel 2 + pack 22 CHF excl. VAT /channel /mo
- CH fixed & mobile included
- Professional fair-use Boxis
- 1 DID included
Best for Swiss SMEs with predictable voice spend.
Configure →Fair-use — CH + Europe + USA
Unlimited CH / EU / USA fixed & mobile (fair-use)
From
41
CHF
excl. VAT /channel /mo
Channel 2 + pack 39 CHF excl. VAT /channel /mo
- CH + Europe + USA included
- Professional fair-use Boxis
- 1 DID included
For teams calling internationally on a fixed budget.
Configure →Included with every pack
Redundancy / HA
SIP on multiple SBCs / proxies, DNS SRV failover
Multi-routing
Outbound routing by prefixes (national, mobile, international)
Authentication
By IP (SBC / IPBX) or REGISTER (login / password)
Security & encryption
SIPS / TLS and SRTP for media
Codecs
G.711, G.722, optional G.729, Opus on request
CLI presentation
Fixed, per-DID or dynamic CLI for customer-owned numbers
Number portability (geographic / national per regulation) · Detailed CDR, stats, supervision · Unlimited DIDs supported · Custom channel counts on request
Key Features
Advanced Features for Modern Businesses
Boxis SIP Trunk offers comprehensive features designed to meet the communication needs of modern businesses, from small offices to large enterprises.
SIP Protocol Support
Full support for Session Initiation Protocol (SIP) with comprehensive compatibility for SIP-based PBX systems and VoIP equipment.
SIP & SIPS (TLS)
Secure SIP signalling over TLS (SIPS) alongside standard SIP — encrypted trunk registration and call setup for business PBX platforms.
High availability infrastructure
Built on redundant Swiss infrastructure with a 99.9% uptime target — your trunks stay reachable for business-critical voice.
Up to 4000 Concurrent Calls per Dedicated 1Gb/s Uplinks
Up to 4000 concurrent calls per dedicated 1Gb/s uplinks. Scale your telephony capacity based on your actual business needs.
Security & Encryption
Secure communications with TLS encryption support. Protect your voice traffic with industry-standard security measures.
Call Statistics & Analytics
Comprehensive call statistics and analytics to monitor usage, track performance, and optimize your telephony costs.
Business Benefits
Why Choose Boxis SIP Trunk for Your Business?
Discover the advantages of connecting your PBX to the public network with Boxis SIP Trunk service.
Cost Effective
Reduce telephony costs by eliminating the need for traditional ISDN lines. Pay only for what you use with transparent pricing.
Easy Scalability
Scale your telephony capacity up or down based on business needs. No hardware changes required for capacity adjustments.
Easy Integration
Seamlessly integrate with your existing PBX infrastructure. Compatible with most modern and legacy telephony systems.
Global Reach
Connect to the global telephone network. Make and receive calls worldwide with competitive international rates.
Use Cases
Perfect for Various Business Scenarios
Boxis SIP Trunk is ideal for businesses looking to modernize their telephony infrastructure and reduce communication costs.
Enterprise PBX Connectivity
Connect large enterprise PBX systems to the public network. Handle high call volumes with up to 4000 concurrent calls per dedicated 1Gb/s uplinks and reliable infrastructure.
Small Business Telephony
Ideal for small businesses with existing PBX systems. Cost-effective alternative to traditional ISDN lines with better scalability.
Call Center Operations
Support high-volume call center operations with up to 4000 concurrent calls per dedicated 1Gb/s uplinks. Ensure reliable connectivity for customer service teams.
Multi-Location Businesses
Connect multiple office locations through a centralized PBX system. Unified telephony infrastructure across all locations.
Number Porting
Port Your Existing Phone Numbers
Keep your existing phone numbers when switching to Boxis SIP Trunk. We support number porting for Swiss numbers and international numbers from most countries. Contact us for pricing, availability, and porting verification requirements.
Swiss Number Porting
Port your current Swiss phone numbers to Boxis SIP Trunk. Maintain your established numbers and ensure seamless continuity for your customers.
- Porting available for all Swiss numbers
- 08XX special rate numbers supported
- Contact us for pricing and details
International Number Porting
Transfer your international phone numbers from other providers to Boxis SIP Trunk. Reach out to our team to verify portability for your specific country.
- Available for most countries
- Porting verification required
- Contact us for pricing information
Important:
Number porting services are available but are not free. Contact our team for detailed pricing information and to verify portability for your specific numbers.
Next step
Ready to Connect Your PBX?
Contact our team to discuss your SIP Trunk requirements and get a customized solution for your business.
Call billing options
Per-second by default, or unlimited fair-use packs per channel (same model as Swiss Business Pack).
Per second
Outbound per second. Inbound included. Channel from 2 CHF excl. VAT/mo (24 months).
Fair-use Switzerland
+22 CHF excl. VAT/channel/mo — CH fixed & mobile included (professional fair-use).
Fair-use CH + Europe + USA
+39 CHF excl. VAT/channel/mo — CH + Europe + USA fixed & mobile included (professional fair-use).
Volumes scale with channel count. Boxis VoIP fair-use particular conditions apply.