To disable SIP ALG on WRT610N: Web Interface: Administration, Management, under side heading 'Advanced Features' SIP ALG, can be disabled. To disable SIP ALG: ToDo no ALG related options found via web and telnet. This causes that the call transfer fails since the proxy/PBX/endpoint will not recognize the dialog info. In this case, you can look at a WAN packet capture form your firewall to see if your firewall is changing it. If you are using a modem/router in bridge mode it can still intercept and transform these messages if you did not turn it off prior to bridging it. × NETGEAR would like to hear from you about specific features so we can improve your experience. SIP ALG can exist on your Modem or Firewall. 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. Hello: I am trying to disable SIP ALG on my CM500-100NAS Cable Modem. The ALG replaces the private address in "Call-ID" header (not needed at all). SIP ALG is an acronym referring to certain features used in your VoIP system to provide you with flexible, reliable call services.No ALG related options found via web and telnet. If for example the private IP appears in the "Call-ID" it replaces it too.
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