SIP trunking sounds like telecom jargon because it is—but the idea is simple: use internet sessions to connect an existing phone system to the public telephone network. In 2026 most small businesses should buy hosted VoIP instead. SIP trunks remain relevant when you are keeping an on-site or self-hosted PBX on purpose.
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Hosted VoIP vs SIP Trunks
Hosted VoIP (Nextiva, OpenPhone, RingCentral, etc.) gives you the phone system in the cloud. SIP trunks are the “phone lines” you attach to a PBX you still operate. If you do not have a PBX to keep, you probably do not want DIY trunks.
When SIP Trunks Still Make Sense
- You recently invested in an IP-PBX you refuse to rip out
- You have specialized call flows already built on that PBX
- You have in-house or MSP telecom skills to maintain it
When to Choose Hosted Instead
- You want mobile apps and easy remote work
- You lack a phone admin on staff
- You are replacing aging key systems or copper lines
Start with VoIP vs traditional systems and how to choose a business phone.
Buyer Checklist for Trunks
- Peak concurrent call capacity (not seat count)
- Codec support and QoS guidance
- E911 location handling
- Failover / backup internet plan
- Number porting timeline and DID inventory
- Security: TLS/SRTP options and fraud monitoring
Conclusion
Most TalkGrove readers should buy hosted VoIP and skip trunk engineering. Choose SIP trunks only when a PBX you trust is staying. If you are unsure, shortlist hosted Nextiva or OpenPhone and revisit trunks only after a PBX audit says you must keep the box.