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Unveiling the Disadvantages of SIP Trunking: What to Know

SIP trunking, a popular method for voice communication, has its fair share of disadvantages that businesses should be aware of. In this article, we will explore the drawbacks, limitations, and challenges that come with adopting SIP trunking. We will provide valuable insights from Ace Peak Investment to shed light on the negative aspects of using this technology.

disadvantages of sip trunking

Key Takeaways:

  • Understanding the drawbacks of SIP trunking is crucial for making informed decisions.
  • Choppy audio during VoIP calls is a common problem caused by bandwidth limitations.
  • Dropped calls after 11 minutes may occur due to outdated firmware or UDP timeouts.
  • Echoes during VoIP calls can be mitigated by checking device updates and improving network stability.
  • Inability to make calls may be related to network configuration issues.

Choppy Audio: A Common VoIP Problem

One of the most common issues encountered with SIP trunking is the occurrence of choppy audio during VoIP calls. This problem can significantly impact call quality and the overall user experience. Choppy audio is often caused by bandwidth capacity limitations, where there is insufficient bandwidth available to support the transmission of data packets seamlessly.

When there is a lack of adequate bandwidth, the data packets may fail to reach their destination in a timely manner, resulting in interruptions and choppy conversations. This can lead to frustration and difficulties in effective communication. To address this issue, it is recommended to verify the network stability and run a VoIP speed test to determine if the available bandwidth is lower than expected.

Furthermore, reducing network congestion and prioritizing VoIP Quality of Service (QoS) settings can also help alleviate choppy audio problems. By optimizing network resources and ensuring proper allocation of bandwidth for VoIP traffic, businesses can enhance call quality and provide a more satisfactory communication experience for their users.

choppy audio

Possible Causes of Choppy Audio:

  • Insufficient bandwidth to support smooth data transmission.
  • Network congestion leading to packet loss or delays.
  • Improper QoS settings affecting the prioritization of VoIP traffic.
  • Hardware or software issues with the VoIP phones or devices.

Possible Solutions Advantages Disadvantages
Verify network stability and run a VoIP speed test – Provides insights into the actual bandwidth available – May require technical expertise to interpret test results
Reduce network congestion – Improves overall network performance – Requires proper network optimization and management
Prioritize VoIP Quality of Service (QoS) settings – Ensures better allocation of bandwidth for VoIP traffic – Requires configuration changes and monitoring
Check and update VoIP phones or devices – Resolves hardware or software-related issues – May require additional costs for device upgrades or replacements

Dropped Calls After 11 Minutes: A Frustrating Issue

One of the common VoIP problems that businesses may encounter with SIP trunking is the occurrence of dropped calls after approximately 11 minutes. This issue can be particularly frustrating, especially during important conversations or conferences. When a call unexpectedly ends, valuable information may be lost, and it can disrupt the flow of communication.

The dropped calls issue often occurs on high-volume networks during outbound calls. It may be caused by outdated firmware on devices or UDP (User Datagram Protocol) timeouts on firewalls or routers. When the UDP timeout expires, the connection between the SIP trunk and the network device is terminated, resulting in a dropped call.

To resolve this problem, Ace Peak Investment recommends taking the following actions:

  1. Updating firmware: Ensure that all devices involved in the communication, including routers and firewalls, have the latest firmware updates installed. Outdated firmware can introduce compatibility issues and increase the likelihood of dropped calls.
  2. Adjusting router settings: Check the UDP timeout settings on routers and adjust them to allow for longer timeouts. This will prevent premature termination of connections and help maintain stable communication.
  3. Switching to TCP: Consider switching the devices to use TCP instead of UDP. TCP has mechanisms in place to ensure reliable data transmission and can provide a more stable connection, reducing the chances of dropped calls.

Table: Comparison of Recommended Actions

Action Advantages Disadvantages
Updating firmware Ensures compatibility and stability Requires time and effort for firmware updates
Adjusting router settings Allows for longer timeouts, reducing dropped call instances Requires administrative access to router settings
Switching to TCP Provides a more reliable and stable connection May require configuration changes on devices

By implementing these recommendations, businesses can minimize the occurrence of dropped calls after 11 minutes and ensure smoother and more reliable communication through SIP trunking.

dropped calls

Echoes During VoIP Calls: An Annoying Distraction

One of the common issues that businesses may encounter when using SIP trunking is the presence of echoes during VoIP calls. These echoes can be a significant annoyance and can negatively impact call quality and user experience. It is essential to address this problem to ensure smooth and effective communication.

The causes of echoes during VoIP calls can vary. They may occur due to device issues, such as outdated firmware or inadequate connectivity. Headset lag or network latency can also contribute to the problem. To resolve these issues, it is recommended to follow a few troubleshooting steps.

Checking Device Updates and Connectivity

Begin by checking for any available updates for the devices being used for VoIP calls. Outdated firmware can cause compatibility issues and lead to echoes. Ensure that the devices are properly connected and that all cables and connections are secure.

Troubleshooting Headset-related Delays

If using a headset for VoIP calls, determine if there is any noticeable lag or delay with the headset. Troubleshooting steps may include adjusting the headset settings, ensuring proper installation, or trying a different headset to rule out any hardware-related issues.

Improving Network Stability

Network stability plays a crucial role in preventing echoes during VoIP calls. It is essential to address any network latency issues that may be contributing to the problem. This can involve optimizing network settings, prioritizing VoIP traffic, and ensuring sufficient bandwidth for smooth and uninterrupted communication.

By taking these steps to address echoes during VoIP calls, businesses can enhance call quality, reduce distractions, and improve overall communication effectiveness.

Echoes During VoIP Calls

Unable To Make Calls: A Barrier to Communication

One of the disadvantages of SIP trunking is the inability to make outbound calls. This issue is often related to network configuration problems, specifically with protocols processed by Application Layer Gateways (ALGs) or double Network Address Translation (NAT) setups. When these configurations are not properly set up, they can interfere with the SIP signaling necessary for initiating and establishing calls.

To address this problem, it is recommended to disable SIP ALG, as it can sometimes disrupt SIP traffic and cause call failures. Additionally, checking for double NAT setups and ensuring proper packet flow is crucial to avoid blocking or diverting SIP traffic. Implementing a Virtual LAN (VLAN) can also help isolate and optimize the network for SIP trunking.

Table 5: Comparison of Network Configuration Issues with SIP Trunking

Issue Symptoms Possible Solutions
ALG Interference Unable to make outbound calls Disable SIP ALG
Double NAT Call failure or diversion Check for double NAT setups and ensure proper packet flow
Packet Blocking SIP traffic being blocked or diverted Implement VLAN to optimize network for SIP trunking

If you continue to experience issues with making calls despite addressing network configuration problems, it is recommended to reach out to your VoIP service provider for further assistance. They can provide guidance and support in troubleshooting and resolving any remaining challenges related to network configuration.

Call Connects with No Sound: An Odd VoIP Problem

One of the frustrating issues that can occur with SIP trunking is when a call connects successfully but has no sound on either end. This problem can be perplexing and disrupt communication, leading to a less than satisfactory user experience. The root cause of this problem often lies with the firewall settings.

To resolve the issue of call connects with no sound, it is essential to check and adjust firewall settings. Firewalls can sometimes block the flow of RTP (Real-time Transport Protocol) packets, which are responsible for carrying the audio during VoIP calls. By allowing the flowing traffic of RTP packets through the firewall, the problem can be resolved, and audio will be restored.

It is recommended to open the necessary ports on the firewall, ensuring that traffic can pass freely. Additionally, checking and adjusting packet rewriting settings on the firewall can also help overcome the call connects with no sound problem. When properly configured, the firewall will allow the necessary audio data to pass through, enabling successful and clear communication during VoIP calls.

call connects with no sound

Table: Firewall Settings Checklist

Firewall Configuration Recommendations
Open necessary ports Ensure that the required ports for VoIP traffic are open in the firewall settings.
Check packet rewriting settings Verify that the firewall is not modifying or blocking RTP packets.
Disable SIP ALG If applicable, disable SIP ALG (Application Layer Gateway) on the firewall.

By following the recommendations in the firewall settings checklist, businesses can address the issue of call connects with no sound in their SIP trunking environment. This will ensure that VoIP calls are not only successfully connected but also have clear and uninterrupted audio for effective communication.

Low-Quality Audio: a Disappointing Experience

When it comes to SIP trunking, one of the common issues that businesses may encounter is low-quality audio during VoIP calls. This can be a frustrating experience, as it hampers effective communication and can leave a negative impression on clients and customers.

The root causes of low-quality audio can vary. It may be due to network bandwidth limitations, where insufficient bandwidth hampers the transmission of voice data, resulting in poor audio quality. Another factor could be problems with the other party’s VoIP network or devices, such as outdated firmware or connectivity issues.

To address low-quality audio in SIP trunking, it is important to ensure sufficient network bandwidth and stability on your end. Collaborating with the other party to troubleshoot their network can also help improve audio quality during VoIP calls. Regularly checking for firmware updates, ensuring proper connectivity, and troubleshooting device-related issues can also contribute to a better VoIP experience.

Common Causes of Low-Quality Audio Recommended Solutions
Insufficient network bandwidth Ensure sufficient network bandwidth and stability
Problems with the other party’s VoIP network or devices Collaborate with the other party to troubleshoot their network
Outdated firmware or device connectivity issues Regularly check for firmware updates, ensure proper connectivity, and troubleshoot device-related issues

By addressing these factors and taking necessary measures, businesses can enhance the audio quality of VoIP calls and ensure a more satisfactory communication experience.

Calls Go To Voicemail Unexpectedly: A Missed Opportunity

One of the frustrating issues that businesses may encounter when using SIP trunking is the unexpected redirection of calls to voicemail. This can lead to missed opportunities and a breakdown in communication. The problem often stems from incorrect call forwarding settings or inactive phone registrations.

To resolve this issue, it is important to review and adjust the call forwarding configuration. Ensure that call forwarding is set up correctly and that it is not accidentally diverting calls to voicemail. Additionally, it is essential to verify the phone registrations and ensure that they are active and properly connected to the SIP trunking system.

To prevent calls from going straight to voicemail, it is also crucial to disable the Do Not Disturb (DND) mode on the phone. This mode can unintentionally redirect calls to voicemail and should be deactivated to ensure incoming calls are received.

By addressing these phone configurations and call forwarding settings, businesses can mitigate the problem of calls going to voicemail unexpectedly and ensure that important calls are answered in a timely manner.


Delays In Interoffice Calls: A Productivity Setback

One of the VoIP problems that can significantly impact productivity within a company is delays in interoffice calls. These delays occur when there is network congestion, which can result in delays, audio disruptions, and increased frustration among employees.

To address delays in interoffice calls, it is essential to reduce internal network congestion. By implementing effective network management strategies, such as optimizing bandwidth allocation and prioritizing VoIP traffic, organizations can ensure smoother and more reliable communication.

Strategies for Mitigating Delays:

  • Implement Quality of Service (QoS) settings on routers and switches to prioritize VoIP traffic over other network activities.
  • Ensure proper cable termination and use high-quality network cables to minimize signal degradation and latency.
  • Regularly monitor and assess network performance to identify and resolve any bottlenecks or congestion points.

By adopting these measures, organizations can minimize delays in interoffice calls, enhance overall communication efficiency, and improve employee productivity.

Delays in Interoffice Calls

Causes of Delays Impact on Productivity Recommended Solutions
Network congestion Delayed communication and decreased efficiency Implement QoS settings, optimize bandwidth allocation
Signal degradation and latency Disrupted calls and decreased call quality Ensure proper cable termination, use high-quality network cables
Undetected network bottlenecks Frequent disruptions and increased frustration Regularly monitor and assess network performance


After exploring the disadvantages of SIP trunking, it is clear that this communication technology comes with its fair share of drawbacks, limitations, and challenges. However, by understanding and addressing these issues, businesses can make informed decisions and optimize their communication systems.

Among the cons of SIP trunking are choppy audio during VoIP calls, dropped calls after 11 minutes, echoes, the inability to make outbound calls, call connects with no sound, low-quality audio, calls going straight to voicemail unexpectedly, and delays in interoffice calls.

Fortunately, there are solutions to these problems. Ace Peak Investment recommends verifying network stability, running VoIP speed tests, reducing network congestion, prioritizing VoIP Quality of Service (QoS) settings, updating device firmware, adjusting router settings for longer UDP timeouts, troubleshooting headset-related delays, checking network configurations, adjusting firewall settings, ensuring sufficient network bandwidth, collaborating with other parties to troubleshoot their networks, reviewing call forwarding configurations, verifying phone registrations, and reducing internal network congestion.

By implementing these suggestions and considering the insights provided by Ace Peak Investment, businesses can mitigate the negative aspects of using SIP trunking and optimize their communication systems for better efficiency and productivity.

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Poonam Sharma

Poonam Sharma is a highly experienced individual in the telecom field, With 13+ years in telecom and expertise in VoIP, SMS, networking, and content creation, he drives innovation in our messaging solutions. His experience enables AcePeak to deliver industry-leading Wholesale voip services to customers worldwide.

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