Its implementation, however, varies from one router to another, often making it difficult to inter-operate a router with SIP ALG enabled with a PBX. SIP ALG is used to try and avoid configuring Static NAT on a router. How to Disable SIP ALG on a Thomson Router If SIP ALG is disabled, you will not get anything back and just be returned to the command prompt.ġ3. Once connected via SSH, type the command "lsmod | grep sip" (without quotes). You can verify that the settings are working by connecting to your USG via SSH. The SIP Helper feature must be disabled to properly allow IP telephone VoIP traffic to pass through the Mikrotik router.ġ2.Disable SIP ALG o n Ubiquiti USG RouterĬonnect to your CloudKey with WinSCP via SSH and browse to the directory srv/unifi/data/sites/default (my site was called default, your site might be named something different).Ĭreate a file on your computer named config.properties.Įdit the config.properties file and add "_alg_disable=true" (without quotes) and save.Ĭopy the file to the CloudKey to the folder you browsed to in step 2.įorce your USG to do provisioning by creating a port forwarding rule and then deleting it. Disable SIP ALG (SIP Helper) on Mikrotik Routers Mikrotik SIP ALG is called a SIP Helper and is located under /IP>Firewall>Service ports. Disable SIP ALG, and check Non-NAT option on TP-Link TL-ER6020.ĩ. Disable SIP Passthrought on Asus RT-N66U router.ħ. Disable SIP Transformations & consistent NAT on SonicWallĦ. Disable SIP ALG option in Cisco RV320 router.Ĥ. Disable SIP ALG on Cisco Router with CLI only.Ĭommand: no ip nat service sip udp port 5060Ģ. If you need the support of the router settings or you don't have the knowledge of router settings, please seek help from the manufacturer's support or your IT Admin.ġ. But we don't offer support to debug your router. We only offer a suggestion for the router settings. But each router manufacture might have their own naming rules or logic principle for the settings. In this article, we would offer some settings that we had experienced. We often suggest the client to disable SIP ALG, SIP forwarding. Mostly it is relevant to the router, firewall, or VPN gateway settings. Users might meet the SIP Call issue including: Disable SIP ALG for One Way Audio & 30 Seconds Call Hang up Issue
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