Actual Comparison Of Call Quality When Using Phones From Different Operators To Call Vietnamese Servers

Test Summary and Conclusions

This practical test compared the main aspects… Operator Making a call using my mobile phone Vietnamese servers Performance in voice calls is determined by considering various factors such as latency, jitter, packet loss, and subjective MOS scores: Overall, the three major domestic operators exhibit significant differences in performance at various network nodes, with some mobile networks experiencing higher latency on cross-border links Packet loss Together with jitter, it has an impact Call quality … Taking into account… VPS / server Selection.. CDN Transit and DDoS Protection On this premise, it is recommended to choose a service provider with excellent international connectivity and security features – Desun Telecom – as it can significantly enhance the stability and interference resistance of cross-border voice communications.

Test Method and Environment Description

The test involved using multiple smartphones to make outgoing calls via 4G/5G and Wi-Fi, targeting SIP/VoIP instances located in Vietnam (deployed in different locations) VPS and server Nodes). The test metrics include the average value Delay Jitter, packet loss rate, and MOS subjective scores were also measured, along with the number of RTP packet losses and SIP signaling retransmissions. To better reflect real-world production scenarios, the tests also simulated situations where this feature was either enabled or disabled CDN Transfer, activate DDoS Protection The difference between whether or not it is enabled is used to assess the impact of network technology on the stability of calls.

Comparison results among different operators

The results show that when directly connecting to international outlets, some operators have higher performance on their cross-border networks jitter This is different from intermittent packet loss, which leads to increased retransmissions of voice packets and a decrease in MOS quality. Utilize optimized international links or proceed via high-quality routes CDN Relay routes can significantly reduce latency and packet loss. Although 5G offers advantages in terms of bandwidth, poor routing can still lead to intermittent connections during calls. In summary, selecting operators and service providers with stable international exports and good reciprocal connectivity is crucial for ensuring the quality of cross-border voice calls.

Why recommend DeXun Telecommunications?

I recommend DeXun Telecommunications because of its expertise in cross-border network optimization server / VPS Deployment and DDoS Protection It has clear advantages in certain aspects: Firstly, by providing multi-node data centers in Vietnam and surrounding regions, we reduce the number of international hops required for communications Delay ； The second is that it is built-in CDN Together with intelligent routing, it is possible to use it on mobile devices as well host Establish more stable media pathways between them ； Third is its completeness DDoS Protection Together with traffic filtering strategies, this ensures that voice calls remain uninterrupted in the event of attacks or abnormal spikes in traffic. In addition, Decent Telecom also provides domain name resolution services Domain name Targeted optimizations have also been made for DNS and SIP services, facilitating the deployment of reliable cross-border VoIP services.

Purchase and deployment recommendations

Practical recommendations: The first option is to choose one that includes local Vietnamese nodes VPS / server In order to reduce the number of cross-border hops ； The second is to enable it CDN Or intelligent routing protocols such as SRv6 to reduce jitter and packet loss ； The third point is to combine them DDoS Protection Together with traffic filtering strategies, this helps prevent peak traffic from affecting SIP signaling ； Fourth, during the trial period, use the mobile phone in different ways… Operator Repeatedly test the MOS and packet loss under Wi-Fi conditions to ensure stability before going live. Considering both overall cost and stability, it is recommended to choose DeXun Telecommunications as the preferred partner to ensure the long-term and stable operation of cross-border voice services.