![]() This causes that the call transfer fails since the proxy/PBX/endpoint will not recognize the dialog info. Some phones (as Linksys with latest firmware) encode the "Call-ID" value in the "Refer-To" header (by escaping the dots) so the private IP appearing there is not replaced with the public IP. The ALG replaces the private address in "Call-ID" header (not needed at all).No ALG related options found via web and telnet. ![]() If for example the private IP appears in the "Call-ID" it replaces it too. It replaces the private IP appearing in SIP headers with the public IP using a dumb text replacement.Models: ST530 v6(firmware >= 5.4.0.13) comes with SIP ALG enabled by default. Must disable NAT and put the device in bridge mode.No Solution at this time (SIP ALG, called SIP Pass Through, can not be disabled).No Registeration possible behind NAT as the device changes Call-ID and causes the responses to be discarded by SIP clients/ATAs.Models: SBG6580 (SurfBoard Extreme Wireless Cable Modem Gateway) The following is a list of routers with SIP ALG enabled - detailing the issues encountered and info on how to disable SIP ALG on these routers: In the main menu, select “Advanced” > “WAN Setup”. The default username is “admin” and the default password is “password”.ģ. SIP ALG on this router is known to cause problems with VoIP calls.ġ. Open the Netgear router configuration by browsing to its LAN Address ( by default).Ģ. Log in to the router’s configuration. In this article, we will show you how to disable SIP ALG on a Netgear router. In general, you would want to disable SIP ALG and configure one to one port mapping on the router. 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. This link takes you to page 92 – but also look back to page 91 as this gives a screenshot of the screen where you will find the ALG settings. Any routers not listed here please consult the manufacturers handbook or Google search your router make and model and 'how to disable SIP ALG'.Īccess the SIP ALG on TP Link Archer C2 Router (access to user manual) Below is a list of popular routers that you can disable the SIP ALG settings for.
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