Is the NAT ALG Function Applicable to the H.323 Protocol? How Do I Configure All-Port Mapping? How Do I Configure the Egress Router of an Internet Cafe to Solve the Offline Problem of Online After Outbound NAT Is Configured and then Disabled on an AR Router's Public Network Interface, a...For the VOIP application, sometimes the ISP will ask you to disable SIP ALG on your modem router. Please refer to the following steps to do the configuration. Step 1 Press the Windows Logo Key +" R " Key on the Keyboard at the same time or click on Start button -> Run to open Run program. Step 2 Type in cmd in the open bar and click OK.
Disable SIP ALG (SIP Transformations, SIP Helper, etc.) if you cannot make or receive calls. Dropped Audio: Disable DDoS protection if you lose audio mid-way through the call. No Audio: Forward ports 20,000 - 30,000 to your Vonage device to allow audio traffic.
TP-Link routers: How to Disable SIP ALG on TP-Link ADSL modem router. Linksys: Check for a ‘SIP ALG’ option, in the ‘Administration’ tab under ‘Advanced’. May also need to disable SPI Firewall. Microtik: Disable ‘SIP Helper‘. Netgear: Look for a ‘SIP ALG’ checkbox in the ‘WAN’ settings. Port Scan and DoS Protection should also be disabled. Disable STUN in VoIP phone’s settings.