SIP Troubleshooting

Below are some frequent questions we are asked about SIP/VoIP

 I have one-way audio – IP routing issue, check firewall settings and ports.SIP telephone will not register/provision – IP routing issue, can you ping the provisioning server?Call quality or lost audio problems – Traffic issues, your ISP may be busy or having issues www.speedtest.netBuzzing on the line – Caused by analogue devices, faulty cable/adapter or ATA.Echo during calls – Reconnect call, if problem continues possible traffic issues (see above). 

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Here are some basic firewall configuration settings for SIP/VoIP

 Most SIP/VoIP telephony providers have specific ports and settings that may need altering on your firewall.The following are common firewall ports and settings that are needed for most SIP/VoIP communications providers:TCP – 80TCP – 443UDP – 10000 to 60000UDP – 53UDP – 123TCP & UDP – 5060 & 5062ICMPSIP ALG DisabledSPI Disabled Always check with your SIP provider to confirm the correct firewall configuration required for your SIP/VoIP telephone.Most good hosted telephony providers also offer further support for configuring and provisioning your SIP/VoIP telephone on their hosted telephony service.