It is recommended that your firewall maintainer, switch maintainer or IT consultant is consulted on all matters relating to your communications network including, but not limited to, PBX configuration, LAN and firewall configuration. The information in this document is provided for general guidance only. In addition, SIP ALG provides a wide range of features that. equipment which that is not part of BT's network and which is owned or controlled by the customer) then BT may apply a charge. SIP Application Layer Gateway (ALG) provides the same basic SIP support as the SIP session helper. If faults are reported to BT which are found to be caused by customer equipment (i.e. If this is not implemented correctly then this may result in a degraded service. 6549 0 Share Reply ToshiEsumi Esteemed Contributor II In response to rolo Created on 12-08-2020 09:09 AM Options As mentioned in the KB, it's the original/old/not-VDOM-based way to handle SIP sessions before they implemented ALG (proxy base).
In order to maintain the quality it is essential that the internal network components suitably support the service for delivery of your voice calls. Therefore if you are experiencing problems we recommend that you check your router settings and turn SIP ALG off if it is enabled. This can give you unexpected behavior, such as phones not registering and incoming calls failing. Your BT SIP Trunks service together with a correctly dimensioned BTnet access service has been designed to appropriately support a quality voice service alongside the use of data. SIP ALG modifies SIP packets in unexpected ways, corrupting them and making them unreadable. If your router and/or firewall are "SIP Aware" / has a SIP ALG enabled, then this functionality must be turned OFF so that the device does not interfere with any signalling.
Routers will often have SIP ALG activated by default. It inspects any VoIP traffic to prevent problems caused by firewalls and if necessary modifies the VoIP packets. SIP (Session Initiation Protocol) ALG (Application Layer Gateway) is an application within many routers.
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