SIP Trunking
Cut your voice costs 40-60% by moving trunks to SIP. We compare carriers so you get the best rates.
What is SIP Trunking?
Session Initiation Protocol (SIP) trunking replaces traditional phone lines (PRI/POTS) with a digital connection over your internet circuit. If you have an on-premise PBX that you want to keep, SIP trunking is the most cost-effective way to modernize your voice connectivity without replacing your entire phone system.
SIP trunks are sold by the channel (concurrent call path) rather than by the line, so you only pay for the capacity you actually use. Most businesses save 40–60% compared to traditional PRI circuits.
Why Use an Advisor for SIP Trunking?
SIP trunking pricing varies wildly between providers — the same 20-channel trunk can range from $200/month to $800/month depending on the carrier and your location. We quote every qualifying provider in your area so you see the full range of options. We also verify compatibility with your existing PBX to prevent deployment issues.
SIP Trunking vs. PRI vs. UCaaS
| Feature | SIP Trunking | PRI | UCaaS |
|---|---|---|---|
| Best For | Keeping existing PBX | Legacy compatibility | Full cloud migration |
| Cost per Channel | $10–$25/mo | $15–$30/mo | $20–$45/user |
| Scalability | Add channels instantly | Fixed 23-channel blocks | Add users instantly |
| Equipment | Existing PBX + SBC | Existing PBX | IP phones or softphones |
| Disaster Recovery | Built-in failover | Limited | Built-in |
When SIP Trunking Makes Sense
- You have a working PBX that you’re not ready to replace
- You need to cut voice costs quickly without a major migration
- You have high call volume and want per-channel pricing instead of per-user
- You need geographic flexibility with DIDs in multiple area codes
- You want disaster recovery — SIP trunks can failover to mobile or another location
Frequently Asked Questions
Will SIP trunking work with my existing PBX?
Most modern PBX systems (Cisco, Avaya, Mitel, Asterisk, FreePBX) support SIP natively. Older systems may need a Session Border Controller (SBC) as a gateway. We’ll verify compatibility before quoting.
How many SIP channels do I need?
A common rule of thumb is one channel for every 4–5 users. A 100-person office typically needs 20–25 channels. We analyze your call data to recommend the right count.
Can I port my existing numbers?
Yes, all numbers port to SIP trunking. The process typically takes 7–14 business days. We coordinate the port to minimize any disruption.
Get SIP Trunking Quotes
Tell us your PBX model and channel count. We’ll find the best SIP provider for your setup.
Ready to Compare Quotes?
Tell us what you need and we’ll come back with competing options from multiple carriers. No cost, no obligation.
We typically respond within one business day.
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