In the unfortunate case in which neither of the two paths can be followed, it will be necessary to change router, or hope that the router applies ALG only on the standard SIP 5060 port and therefore you can opt for a change of SIP port of the VOIspeed server, but in doing so I will be necessary. ALG or Application Layer Gateway is a software component that manages specific application protocols such as SIP (Session Initiation Protocol) and FTP (File. In the event that the router allows the deactivation of the SIP ALG functions and you do not know how to do it, you can try to follow the instructions at this link where the instructions for some router models are indicated. You will find it on many commercial and residential Firewalls, Routers, or Modems. Experience shows that those devices are unreliable very often, so it is best to switch off any ALG functionality. Launch the Tether app, select the model of your router and log in with your TP-Link ID or the password you set for the router. SIP ALG stands for Application Layer Gateway. There are devices with Application layer gateway (ALG) functionality, that also inspect the UDP data for IP addresses and thus change SIP and SDP data. Connect your device to the router’s wireless network. In cases where it is not possible because the router does not allow it, you can try to make the SIP gateways (especially VoIP operators) and remote phones work on a non-standard SIP port, such as 5061, but not all operators allow to use this door and it is necessary to ask them expressly if they allow the use of the door or not. : Manage The Router Via The Tp-Link Tether App. Solved: We use a phone system that requires SIP Application Layer Gateway to be disabled on the router. In these cases (practically 100%) the SIP ALG functions must be absolutely disabled. This leads to the already known problems of no audio in at least one of the directions of the call. For random port numbers it is not possible to program port forwarding rules in router. using the WebUI or the CLICommand-Line Interface. The main cause is related to the ALG (Application Layer Gateway) or SIP / VoIP ALG function which, by analyzing the content of the SIP packets (on the standard port 5060 *), modifies the header, compromising the correct routing of the packets. ALG is a security component that manages application layer protocols such as SIP, FTP and so on. Many of the problems related to calls to / from VoIP operators are due to the corporate router and firewall configurations used by the PBX to send and receive audio streams.
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