![]() 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. 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. 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. All SIP sessions accepted by the security policy will be processed by the SIP ALG using the settings in the VoIP profile. In these cases (practically 100%) the SIP ALG functions must be absolutely disabled. SIP ALG configuration overview To apply the SIP ALG, you add a SIP VoIP profile to a security policy that accepts SIP sessions. Use the CLI command delete security alg alg-name disable to enable the SIP ALG. It is normally the last option when you go to advanced settings in your firewall. SIP ALG is a feature found in most networked routers, operating as a function of its firewall. SessionInitiationProtocol(SIP)isanapplication-layercontrol (signaling)protocol forcreating, modifying,andterminatingsessionswithoneormoreparticipants.ThesesessionscouldincludeInternettelephonecalls,multimediadistribution,andmultimediaconferences.SIPisbasedonanHTTP-likerequest/responsetransactionmodel. What is the model of your gateway SIP ALG can only be disabled on certain router's. This leads to the already known problems of no audio in at least one of the directions of the call. By default, the SIP ALG is disabled for SRX5600 and SRX5800 devices. 7 0 4 Like Follow Responses ATTHelp +50 more Community Support 216.7K Messages 3 years ago We're here to help, kjfra66. ![]() 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. ![]() 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. Enable SIP ALG and RTSP ALG Since firmware version 3.8.5, we have made a page for ALG feature.
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