SIP ALG causes one-way audio issues and typically affects all phones on the network. While computer traffic will work fine on the network, SIP ALG can affect the data stream for VoIP. SIP ALG (Application Layer Gateway) is a security setting on most commercial routers. Nextiva recommends that a local Network Administrator whitelist the following rules in the firewall:Įnsuring that the setting for SIP ALG is disabled is another frequent troubleshooting step to fix one-way audio issues. Both routers and firewalls use access rules to control traffic and verify the source and destination addresses are permitted to send and receive traffic on the local network. Recommended Network Quality Speed Test Resultsįirewall Access Rules control the flow of inbound and outbound Internet traffic from the local network to the public Internet. Compare the results with the chart below.
To run the Nextiva Network Quality Speed Test, click here. Jitter must be less than 15 – 20 ms, and packet loss must be 0%. need an upload and download speed of 0.3 Mbps each. Computers and connected devices such as wirelessly connected cellular phones, printers, etc. VoIP devices require an upload and download speed of 0.1 Mbps each.
To begin troubleshooting dead air, verify the integrity of the local network. If the problem occurs on one phone, the underlying cause can vary from hardware to network configuration. One of the more common problems when making and receiving VoIP calls is when a call connects, but one or both parties hear no audio, also known as “dead air.” When determining the cause of dead air, it is essential to determine if the issue occurs on one or multiple phones.
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