![]() ![]() Most have ALG enabled by default, which is usually fine for Cisco but worth noting that not across all versions of firmware. Some success when disabling ALG which likely will need help from Internet provider. Some people have had success others needed to replace device.ĭisable ALG and Quality of Service (QoS), then DMZ to better router. Some providers offer specific configurations for these routers.ĭisable ALG and SPI firewall. Recommend uploading latest and greatest firmware and try to disable ALG in order to maximize chance of success.ĭisable DoS protection and ALG (may need to be done over Telnet using sys sip_alg 0 and then sys commit and sys reboot).ĭisable SIPALG and QoS may be needed. DIR series in general is hit or miss based on version you are using. Replace or try new version when it gets released.ĭisable SIPALG and SPI firewall. Issues observed even in DMZ or bridge mode.ģ.X firmware NAT ALG must be enabled in order to register phone but over time it causes registration problems.Ĭurrent firmware has issues for VoIP. Disable ALG, but sometimes still need to place in DMZ mode or replace.ĭisable ALG (Advanced Setup > NAT > ALG > Uncheck SIP Enabled). Providers may have configuration files for these. For DDR2200 Cisco SIP ALG is disabled through a hidden page (/algcfg.html then disable). May still be issues with SIP NAT ALG (enabled by default). Even in DMZ/bridge mode issues remain.Ĭhange firewall to LOW setting. Increase length of UDP timeout.ĭisable firewall and place into DMZ mode to a different router.Īudio and registration problems. DMZ mode or replace.ĭisable ALG (SIP Protocol Handler > set to Disabled). Try disabling the software firewall as it causes registration issues for phones (unless phones are UDP port 5060). No way to disable the ALG configuration, which causes audio problems and sometimes registration failures. Non DD-WRT stock models and DD-WRT NXT (stripped down) Also any other DD-WRT versionĭD-WRT firmware is robust and has many features. Registration issues and intermittent audio. Best to DMZ to a compatible router.į5D, F6D, F7D, FDS, F9K Series (and others) 600 seconds) as otherwise this could cause NAT problems.Įnable SIP ALG for this device but expect audio issues. ![]() Also worth increasing UDP timeout period (e.g. Disable ALG and if still issues upgrade firmware.ĭisable ALG (Firewall > Firewall Rules > Custom FirewallAccess and then disable SIP rules). Check Advanced Settings > WAN > NAT Passthrough > SIP Passthrough and verify disabled. enable Telnet and then nvram set nf_sip=0 and then nvram commit and power cycle). Disable ALG (Telnet required for this on some firmware versions i.e. Do not recommend this device if you are using Polycom phones due to inability to change DNS servers. New version only as old versions you cannot disable the ALG configuration. Recommend changing firewall setting to LOW to improve stability for audio. Even in DMZ or bridge mode there are issues with this device. Some providers offer configuration details. Add Google DNS servers (8.8.8.8 and 8.8.4.4) if using Polycom phones. Set firewall to OFF or likely will have fax issues. For MI424 you may need to add QoS rules for the VoIP provider's PBX. ![]() If using Polycom phones, suggest adding 8.8.8.8 and 8.8.4.4 as DNS custom servers (i.e. Q2000, Frontier F2250, MI424 (hardware E or higher)ĭisable SIP ALG. Recommend DMZ mode and use a different router. Registration issues and no way to disable SIP ALG.Īudio issues. Always update the firmware to the latest version if you experience any VOIP issues with any router/firewall. Load DD-WRT firmware ( File:WRT54GL DDWRT Install Guide.doc), Standard BuildĪ more extensive Router Compatability list, but certainly not complete. Here is a link to a more current list of routers tested for SIP:ĭSL Modem Router Combination (For DSL ONLY) The list is by no means complete but it is provided for reference. ![]() Entries highlighted in green have been reported by our dealers to meet or exceed their needs. This list of routers have been found to be compatible with SIP PBXs. ![]()
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