Refer to the router user manual for specific steps on how to disable SIP ALG or contact your Internet Service Provider for assistance. Ensure that SIP ALG (Application Layer Gateway) is disabled.Navigate to the Advanced Firewall settings.These are the general steps to change this setting in most router models: Calls go straight to voicemail for no known reasonĭisabling SIP ALG on the router may help resolve the issues above.Audio cuts out completely while on a call and doesn’t return.Inbound or Outbound calls fail to connect.One-way or no-way audio, intermittently or consistently. ![]() ![]() These often happen without the user knowing and can include: There are various ways SIP ALG can impact VoIP service.
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