Disable SIP ALG (SIP Helper) on Mikrotik Routers

TL;DR

To allow VentureTel VoIP traffic to pass through a Mikrotik router, the SIP Helper feature must be disabled. This feature is located under IP>Firewall>Service ports and can be disabled by running the command /ip firewall service-port disable sip from the terminal. Alternatively, it can be disabled through the GUI by navigating to IP>Firewall and clicking on the Service Ports tab. Disabling SIP Helper can resolve issues such as dropped calls and delayed audio.

Mikrotik SIP ALG is called a SIP Helper and is located under /IP>Firewall>Service ports. The SIP Helper feature must be disabled to properly allow VentureTel VoIP traffic to pass through the Mikrotik router.

To disable, run this command from the terminal:

/ip firewall service-port disable sip

Or from winbox just navigate to IP>Firewall and then click on the Service Ports tab and disable it through the GUI.

If SIP helper is enabled, you may experience things like dropped calls, delayed audio, delay in answering and phones not ringing.