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What is SIP Trunking?

SIP (Session Initiation Protocol) trunking has become an essential technology for businesses needing to handle voice communications over IP networks. SIP trunks allow companies to leverage VoIP telephone systems without needing to maintain costly, traditional phone lines. 

By sending voice traffic over the internet, SIP trunking provides tremendous flexibility and cost savings. However, to realize these benefits, it is crucial to choose the right SIP trunk provider.

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Understanding SIP Trunking

SIP trunking refers to using SIP protocol to facilitate voice calls over an IP network or the internet. It acts as a virtual alternative to old-fashioned PSTN (public switched telephone network) connections. SIP trunks transmit your phone calls as data packets, allowing you to ditch physical phone lines. This frees your business from geographic restrictions and helps optimize costs.

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Here are some key advantages of SIP trunking:

  1. Cost savings – By sending calls over the internet, SIP trunks avoid PSTN line fees. This reduces your phone bill.
  2. Flexibility – Staff can use VoIP desk phones in the office or softphones when remote. Calls can be answered anywhere with an internet connection.
  3. Scalability – It’s easy to add or remove SIP trunk channels as your needs change. This flexibility supports business growth.
  4. Advanced features – SIP supports rich features like IVR menus, call recording, conferencing, voicemail to email, and more.
  5. Reliable service – Leading providers deliver excellent uptime with built-in failover methods.

SIP trunks are often used with cloud-hosted PBX phone systems, but can also be leveraged with on-premise VoIP PBXes. The trunks connect your phone system to the PSTN so you can make and receive external calls.

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Factors to Consider When Choosing a SIP Trunk Provider


SIP trunk pricing can vary greatly between providers. Examine each provider’s monthly per-channel costs, pay-as-you-go rates, and any minimum commitments. Watch for hidden fees. Unlimited calling plans are preferred to minimize unforeseen costs.


High availability is vital for business communications. Scrutinize SLAs and uptime stats. Look for geo-redundancy, automatic failover, and disaster recovery provisions in case of an outage.


Evaluate how easily providers scale SIP channels to align with business growth. Having available capacity helps ensure you can add trunks immediately when needed.


Important features include caller ID, E911, toll-free numbers, call forwarding, voicemail, IVR menus, call recording, conferencing, number porting, and more. See what’s included or available add-ons.

Integration Ability

The SIP trunking platform should integrate seamlessly with leading telephony systems and business software. This enables unified communications.

Customer Support

Find providers offering 24/7 technical support via phone, email, and chat. Self-service customer portals with knowledge bases are also valuable.

Top SIP Trunk Providers

Below are leading SIP trunk providers that offer excellent solutions:


Our recommended top choice SIP trunking provider


Well-known low-cost provider


Focus on large enterprises

Provider Comparison Table :- 


Price per Channel

Reliability %

Call Quality


Key Features


Overall Rating






Robust feature set

24/7 support







Basic features

Limited support





Very good


Advanced UC features

24/5 support


In-Depth Analysis of AcePeak

Our highest recommendation for most business SIP trunking needs is AcePeak. Here’s an in-depth review of why they’re an excellent choice:



AcePeak offers very affordable pricing starting at just $24.99 per month per SIP trunk. Volume discounts available. No contracts or commitments required. Unlimited calling plans allow predictable costs.

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AcePeak delivers outstanding 99.999% uptime with a financially-backed SLA. Their resilient VoIP network has built-in redundancy and automatic failover. Disaster recovery systems ensure business continuity.

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Call Quality

Leveraging premium G.711 and Opus codecs over their optimized network, AcePeak provides pristine HD call quality. Jitter buffers and QoS ensure flawless VoIP calls.



AcePeak makes it easy to add or remove SIP trunks on demand. Their network offers virtually unlimited capacity to scale with your business needs.



AcePeak has a robust set of features - unlimited calling, caller ID, call forwarding, E911, voicemail to email, IVR menus, call recording, number porting, and much more.



Friendly and knowledgeable 24/7 customer support is available via phone, email, and live chat. AcePeak also provides helpful documentation and online resources.

With this winning combination of affordable pricing, excellent service, and robust capabilities, AcePeak satisfies the SIP trunking needs of SMBs and enterprises alike. Their outstanding performance earns our highest recommendation.

Pricing Plan Comparison

Let’s do a deeper dive into the pricing models and plans offered by the top SIP trunk providers:


1) AcePeak

  • Starts at just $24.99 per month per trunk
  • Volume discounts for multiple trunks
  • Unlimited calling options without per-minute charges
  • No contracts or commitments
  • No setup fees or hidden charges

2) Nextiva

  • Starts at $19.99 per month per trunk
  • Pay-as-you-go per minute rates can add up
  • Overage fees above included minutes
  • Annual contract required
  • Setup fees apply

3) Ajoxi

  • Starts at $29.99 per month per trunk
  • Bundled minute packages available
  • Overage charges apply
  • Minimum 3-month term
  • Large setup fees for enterprise accounts

Integration Options

Seamless integration with your existing business systems maximizes the value of SIP trunking. Here’s how the major providers stack up on integration ability:


Offers turnkey integration with 30+ leading CRM, PBX, and productivity platforms. Zapier integration enables connecting with thousands of popular apps. API and SDK available for custom integration.


Integrates with major CRMs and PBX systems. Limited app integration capability. Lacks custom API or SDK options.


Tightly integrates with Microsoft software ecosystem. Partnerships with other major platform providers. Focused mainly on larger enterprises.

Their integrations facilitate unified communications and enhanced productivity across the tech stack.

Security and Compliance

Given the sensitivity of communications, it’s imperative for SIP trunk providers to implement robust security and compliance provisions.

AcePeak – Leverages TLS and SRTP encryption to secure calls and data. Redundant data centers feature cutting-edge physical security. Compliant with HIPAA, PCI DSS, GDPR, and CCPA.

Nextiva – Uses encryption for data security. Minimal compliance with regulations. Lacks advanced security features.

Ajoxi – Enterprise-grade security framework with encryption, access controls, and cybersecurity monitoring. Industry compliance certifications.

AcePeak offers a winning blend of strong security precautions appropriate for companies of all sizes. Their policies ensure excellent data protection and compliance.

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Customer Support and Resources

Reliable customer support provides peace of mind when issues arise. Here’s how the top contenders compare at providing assistance:

  • AcePeak

    24/7 live phone, email, and chat support from knowledgeable reps. Online knowledge base and forums resolve common questions.

  • Nextiva

    Phone and email support available weekdays from 9-6pm EST. Minimal self-help resources.

  • Ajoxi

    Robust online resources and 24/5 support catered for large businesses. Longer wait times.

AcePeak shines when it comes to helpful around-the-clock customer support. Their combination of live assistance and self-service options provides confidence that needs will be addressed promptly.

Future Trends in SIP Trunking

  1. SIP trunking technology will continue advancing. Key trends to expect:
  2. Migration from legacy to All-IP networks
  3. Broader cloud integration platforms
  4. Rise of SIP trunking-as-a-service subscriptions
  5. Increased cybersecurity protections
  6. More advanced real-time analytics and reporting
  7. Universal SIP interoperability standards
voice wholesale rates and quality

AcePeak is well-positioned as an innovative leader in SIP trunking. They are already embracing API expansion, cloud integrations, subscription pricing, and other emerging capabilities. AcePeak’s development roadmap will ensure they stay ahead of the curve.

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