XG Firewall supports VoIP using both Session Initiation Protocol (SIP) and H.323 standards.
MyITHub is leading provider of Business VoIP Phone Systems, IP-PBX, Headsets, Gateways, Routers, Switches, Conferencing Solutions and Network Security, having warehouses in all major cities across Australia. UDP time-out value causes VoIP calls to drop or have poor quality. What to do if VoIP calls drop or have poor quality. VoIP call issues over site-to-site VPN or with IPS configured. Resolve issues with VoIP call quality when there is a site-to-site VPN or IPS configured on XG Firewall.
How to resolve common VoIP issues. The most common issues encountered with VoIP are poor call quality, one way audio, or calls dropping. You only need to carry out the steps that are relevant to your own VoIP setup. The best channel partners, resellers, affiliates and consultants that offer Email solutions in Netherlands.
Your VoIP provider will supply the configuration details for your VoIP system. You will then need to configure a firewall rule to allow either the SIP or H.323 service.
The H.323 and SIP standards provide a foundation for audio, video, and data communications across IP-based networks. This enables users to participate in video and audio conferences, even though they are using different applications. H.323 and SIP use different flows for signaling and data transfer. Signaling flow is used to negotiate the configuration parameters, the IP address and the port that are used to establish the data flow. These protocols are harder to filter by firewalls since they violate layering by introducing layer 3 and 4 parameters in layer 7 of the OSI model. To overcome this situation in iptables, Netfilter provides connection tracking helpers which are modules that are able to assist the firewall in tracking these protocols.
The most common issues encountered with VoIP are poor call quality, one way audio, or calls dropping. To resolve some of the common issues with VoIP, see the related links.
What to do if VoIP calls drop or have poor quality.
Condition
VoIP calls drop or have poor quality.
Cause
If there are no errors in the SIP configuration, VoIP issues are usually due to the UDP time-out value.
Sophos Firewall has a default UDP time-out of 60 seconds which is usually low for reliable VoIP communication. Usually the VoIP provider recommends a UDP time-out value, typically 150 seconds.
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To change the current UDP time-out value from the command line interface (CLI), choose option 4. Device Console and do as follows:
Remedy
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- Type: show advanced-firewall
The current UDP time-out value is shown next to UDP Timeout Stream.
- Type: set advanced-firewall udp-timeout-stream 150
The above command will increase the UDP time-out to 150 seconds. If your provider recommends a different value, use that.