Most VoIP call quality problems are not VoIP problems. They are network problems. Choppy audio, dropped calls, one-way audio, echo, and high latency are almost always caused by a network that was designed for data traffic and never properly optimized for real-time voice. Voice over IP is unforgiving. Unlike a file download or a webpage that can buffer and retry, a voice call needs packets delivered consistently and in order with minimal delay. A network that handles everything else fine can make VoIP calls sound terrible.
Telphi designs and optimizes network infrastructure for VoIP performance for businesses across the US, UK, and Canada. We configure Quality of Service to prioritize voice traffic, plan bandwidth correctly so calls never compete with data for capacity, design network redundancy so phone calls stay up when a connection goes down, and set up monitoring that catches performance problems before your team starts complaining about call quality. Our clients go from a network where VoIP calls are unreliable to one where they are indistinguishable from a dedicated phone line.
Network designs optimized for: RingCentral, Microsoft Teams Phone, Zoom Phone, Dialpad, 8x8, Nextiva, and all major VoIP platforms.
When a business deploys a VoIP phone system and the call quality is poor, the instinct is to blame the VoIP platform. In most cases the VoIP platform is working exactly as it should. The problem is the network carrying the calls.
Voice calls transmitted over IP have very specific network requirements that most business networks are not configured to meet by default. They need low latency. They need low jitter. They need zero or near-zero packet loss, because a lost voice packet means a gap or distortion in the audio with no way to recover it. And they need enough consistent bandwidth that voice packets are never queued behind large data transfers.
A business network that handles email, web browsing, file sharing, and cloud applications perfectly well can still produce terrible VoIP call quality because none of those applications have the same real-time delivery requirements as voice.
The solution is not just a faster internet connection. The solution is correct network design and configuration. Quality of Service rules that tell the network to prioritize voice packets over everything else. Bandwidth planning that ensures the connection is never saturated during business hours. Network architecture that eliminates the bottlenecks that cause jitter. And monitoring that shows when network conditions are degrading before call quality becomes a problem.
Telphi designs network infrastructure specifically for VoIP performance. We start with an assessment of your current network, identify exactly what is causing your call quality issues, and design a solution that makes your VoIP system perform reliably regardless of what else is happening on the network.
A complete network infrastructure design for VoIP from Telphi covers every layer that affects call quality and reliability. Here is what gets addressed in every engagement.
Quality of Service, or QoS, is the set of rules that tells your network how to prioritize different types of traffic. Without QoS, your router treats a voice packet the same as a file download or a software update. When your internet connection gets busy, voice packets queue behind data traffic and call quality suffers. With correctly configured QoS, voice packets always get processed first regardless of what else is happening on the network. Telphi configures QoS across your routers, switches, and firewall to give voice traffic the priority it needs at every point in the network path.
VoIP calls consume a predictable amount of bandwidth per call. A business with 20 concurrent calls needs approximately 2Mbps of dedicated bandwidth for voice alone. If your internet connection is consistently at 80% utilization during business hours, those calls will experience quality issues even with QoS configured. Telphi calculates your actual bandwidth requirements based on peak concurrent call volumes and assesses whether your current connection has sufficient consistent headroom.
The physical and logical design of your network affects VoIP performance in ways that are not always obvious. The number of network hops, the quality and configuration of switches, the presence of NAT that is not VoIP-aware, and the routing path for SIP traffic all affect call quality. Telphi reviews your network architecture and identifies any design elements degrading VoIP performance.
A single internet connection is a single point of failure for any business that depends on VoIP for its phones. Telphi designs network redundancy for VoIP reliability. Dual internet connections from different providers with automatic failover so calls switch to the backup connection within seconds of the primary going down. For businesses where phone availability is business-critical, network redundancy is not optional.
Separating voice traffic onto its own network VLAN isolates it from the unpredictable behavior of data traffic on the same physical network. A large file transfer on the data network cannot affect voice packets on the voice VLAN. Telphi implements voice VLAN configuration across your network switches as part of every VoIP network design, providing both performance isolation and security benefits.
SIP ALG is a feature present in many routers that causes more VoIP problems than it solves. One-way audio, calls that connect but have no audio, registration failures, and dropped calls are all commonly caused by SIP ALG interference. Telphi identifies and disables SIP ALG where it is causing problems, configures NAT correctly for SIP traffic, and sets up the SIP proxy or Session Border Controller configuration that makes VoIP work reliably through your network boundary.
Telphi sets up network monitoring that tracks the metrics that matter for VoIP performance: latency, jitter, packet loss, bandwidth utilization, and connection availability. When any metric approaches the threshold where call quality will be affected, alerts go to the right people before your team starts experiencing problems.
Every network infrastructure engagement follows a structured process. We assess before we design and we test before we hand over. Here is exactly how it works.
We measure latency, jitter, and packet loss on your internet connection. We review your router, switch, and firewall configuration. We test your QoS configuration. We measure bandwidth utilization at peak times. We run a VoIP readiness test that simulates your expected call volume. At the end you receive a written network assessment report with every finding, a VoIP readiness score, and a prioritized list of changes needed.
Great for:
IT managers and business owners experiencing VoIP call quality problems who need to know exactly what is causing them, or businesses planning a VoIP deployment who want to verify their network is ready first.
We design and implement the network changes identified in the assessment. QoS configuration, bandwidth planning, VLAN design and implementation, SIP ALG and NAT configuration, firewall rule updates for VoIP protocols, and redundancy configuration where required. Every change gets documented with full before and after records of the network configuration.
Great for:
Businesses deploying a new VoIP system wanting the network correctly configured before go-live, or businesses with an existing system experiencing call quality issues that need to be resolved.
After all configuration changes are applied, we run a full verification test. Simulated call load testing at peak volumes. MOS score measurement on test calls. Latency, jitter, and packet loss measurement after QoS is applied. Failover testing if redundancy has been configured. We do not sign off until the test results confirm call quality meets target thresholds.
Great for:
Every business. This step confirms the network design is working correctly before your team depends on it for live calls.
We set up monitoring across your network with alerts configured for the metrics that affect VoIP performance. Regular performance reviews confirm the network continues to meet requirements as the business evolves. As your call volumes grow or new applications get deployed, we advise on any network changes needed to maintain performance.
Great for:
Businesses that want proactive management of their network performance rather than finding out about problems when staff start complaining about call quality.
Every call your team makes on a poorly performing network is a reflection on your business. Choppy audio makes your team sound unprofessional. Dropped calls mean customers have to call back and explain themselves again. One-way audio means conversations have to be repeated multiple times. These experiences accumulate into a customer perception that your business is difficult to communicate with.
When VoIP call quality is unreliable, staff spend time on workarounds. Calling back customers whose calls dropped. Asking people to repeat themselves. Switching to mobile phones to avoid the office VoIP system. Every workaround consumes time that should be spent on actual work.
For businesses in regulated industries where call recording is a compliance requirement, a network that drops calls or fails to record them correctly creates compliance gaps. A network that cannot deliver consistent VoIP performance makes compliance harder to maintain and creates exposure in audits.
Most businesses experiencing VoIP quality problems blame the VoIP platform and spend months trying different settings without identifying that the network is the actual cause. A proper network assessment identifies the root cause in days rather than months.
Every industry has specific network requirements depending on VoIP call volumes, compliance obligations, and operational environment. Telphi has designed and optimized VoIP network infrastructure for businesses across all of the following sectors.
Network infrastructure designed for HIPAA compliant VoIP, reliable connectivity across multiple clinic sites, redundancy for patient communication systems.
Learn moreLow-latency network design, PCI DSS compliant network segmentation, redundant connections for business continuity, and call recording network capacity planning.
Learn moreSecure network design for attorney-client communications, reliable connectivity for multi-office law firms, and network infrastructure for encrypted call recording.
Learn moreHigh-capacity network design for large agent deployments, QoS for hundreds of simultaneous calls, and network redundancy for continuous availability.
Learn moreMulti-site network design connecting factory floors and offices, reliable VoIP over industrial network environments, and emergency communication network infrastructure.
Learn moreNetwork infrastructure for agents working across multiple locations, mobile VoIP performance optimization.
Learn more"We spent four months thinking the problem was our VoIP platform. Telphi assessed the network in three days and fixed the actual cause in a week. We have not had a call quality complaint since."
"Having Telphi verify and fix our network before the VoIP system went live meant we had zero call quality problems on go-live day. The readiness assessment process was exactly the right approach."
"Six months of one-way audio on 20% of our calls. Telphi identified the cause in one day and fixed it the same afternoon. We wished we had called them on day one."
If your VoIP calls are unreliable, the network is almost certainly where the problem is. And if you are deploying VoIP for the first time, getting the network right before go-live is significantly cheaper and less disruptive than fixing it after your team is already experiencing problems. Fill in the form below and a Telphi network infrastructure specialist will reach out within one business day. No commitment required. Just a straight conversation about your current network setup, the call quality issues your team is experiencing, and what a network assessment would find.
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