Capacity
Match capacity to the pace of your business — from one channel to hundreds simultaneously, with instant, frictionless scaling.
Elastic SIP trunks · built for AI
Connect your AI voice agent to the global phone network.
Elastic SIP telephony for Costa Rica and beyond. Provision channels and numbers in minutes, pay only for what you use, and scale from one to hundreds of concurrent channels — frictionless.
✓ Instant activation
✓ No commitments
✓ Local support
Works with your AI stack
ElevenLabs
Vapi
Retell AI
Bland.ai
Synthflow
Twilio API
Asterisk
FreeSWITCH
At a glance
SIP.cr in numbers.
What you need to cite, compare, or decide.
- Channels from
- $4 USD/month
- DID numbers from
- $3 USD/month
- Minute billing
- per second
- Supported codecs
- G.711, Opus
- Average SIP latency
- < 50 ms
- SIP authentication
- IP · Registration · Digest
- Activation time
- minutes
- Commitment
- no contract
Capabilities
Everything you need to take your AI agent to production.
Elastic capacity, on-demand numbering, and transparent minutes — all on one platform.
Numbers
On-demand numbering with instant activation and centralized management. Grow without limits and without unnecessary costs.
Minutes
Minutes billed at regulated rates with full transparency, destination visibility, and precise consumption control.
Why SIP.cr?
Built for real-time voice.
Latency, codecs and routing engineered so your AI agent sounds natural on every call.
Ultra-low latency
Infrastructure optimized for real-time audio with direct routes to tier-1 carriers.
G.711 & Opus codecs
Native HD-Voice quality, compatible with every major AI voice engine on the market.
REST API & Webhooks
Provision trunks, numbers and pull CDRs via API. Real-time events through signed webhooks.
Flexible auth
IP, registration or digest auth — pick what best fits your PBX or AI engine.
Full observability
Per-route quality metrics, automatic alerts, and a CDR panel with search and export.
Multi-tenant
Designed for resellers and platforms. Sub-accounts, white-label and granular billing.
Compatible platforms
Ready for your favorite AI voice engine.
SIP.cr speaks standard SIP. Any AI voice platform with SIP support integrates without friction.
- ElevenLabs
- Voice synthesis platform with native SIP trunk integration for live calls.
- Vapi
- Developer platform for building AI voice agents with SIP trunking.
- Retell AI
- Real-time AI voice infrastructure with native SIP support.
- Bland.ai
- AI conversational phone calls.
- Synthflow
- No-code AI voice agent builder.
- Twilio Programmable Voice
- Programmable voice platform, interoperable via SIP trunking.
- Asterisk
- Open-source PBX, industry standard.
- FreeSWITCH
- Open-source telephony stack, used at SIP.cr.
Use cases
AI voice in production — no more excuses.
From outbound agents that qualify leads to intelligent IVRs that replace static menus.
Voice agents that call first.
Connect ElevenLabs, Vapi or Retell to SIP.cr and launch outbound campaigns with local caller ID, concurrency control and per-agent CDRs. Scale to hundreds of simultaneous calls without touching infrastructure.
Conversational IVR
Replace DTMF menus with AI agents that understand and resolve in a single call.
Automated reminders
Mass calls with natural voice, with handoff to a human when needed.
Support without queues
Your support agent answers, qualifies and escalates — all day, in your language.
NPS and voice feedback
Short calls, natural responses, metrics ready to analyze.
Pricing
Pay only for what you use.
No hidden fees. No commitments. Activate what you need today and grow tomorrow.
Channels
$4/mo
per concurrent channel
Numbers
$3/mo
per DID number
Minutes
Regulated rates
billed per second
Calculator
Estimate your monthly bill.
Drag the sliders. Your estimate updates instantly in USD.
Breakdown
Channels$40.00
DID numbers$6.00
Mobile minutes$350.00
Landline minutes$150.00
Estimated total
$546.00/mo
Reference estimate in USD. International rates and special destinations may vary.
Frequently asked
What people ask the most.
How fast can I activate my first trunk?
In minutes. After creating your account you can configure a SIP trunk, assign a number, and start testing right away — no manual approvals.
Is it compatible with ElevenLabs, Vapi, Retell or other AI platforms?
Yes. SIP.cr speaks standard SIP, so any AI voice platform that speaks SIP integrates without friction. We ship presets for the most popular providers.
What if I need to scale from 5 to 200 channels?
Change capacity from the panel — billing is prorated automatically. No tickets, no waiting. Elasticity that is actually elastic.
Which authentication modes are supported?
IP-auth (default), registration (your PBX registers to us), and digest auth for scenarios with 407 challenges. Pick the one that fits your voice engine.
Are there activation or commitment fees?
No. No activation fees and no commitments. You pay only for the channels, numbers, and minutes you actually use.
In what currency are services billed?
In US dollars (USD). We charge to your card and issue electronic receipts for Costa Rica.
Contact
Let's talk about your AI voice project.
We reply within 24 business hours. Local support in Spanish, English, and Portuguese.
Instant activation
Bring your AI voice agent to the phone network today.
Account creation takes under a minute. No credit card to start, no commitments, local support.