Comcast dpc3941b sip alg. DNS server addresses need to be changed to set of efficient DNS servers, like Google's Your office router might have some preconfigured settings that could disrupt your VoIP calls. Avoid common issues such as SIP ALG, double NAT, and multicasting. 0 16x4 Wireless SIP ALG is enabled by default and cannot be disabled, causing intermittent phone call and feature failures. SIP ALG inspects and modifies SIP traffic One way to deal with the SIP ALG option is to configure Xfinity-provided Gateway into bridge mode, and get your own router that has SIP ALG as an available and configurable feature. Unfortunately, since the Cisco is a Comcast-controlled device, The SIP ALG Hardening for NAT and Firewall feature provides better memory management and RFC compliance over the existing Session Initiation Protocol (SIP) application Learn how to configure the Comcast Cisco DPC3939B/DPC3941B Gateway for optimal network performance with Nextiva. Learn how to fix your VoIP audio issues. We are experiencing issues with our voip phones and our voip provider has recommended turning off SIP ALG as well as all NAT functions on the router. . They initially suggested bridge mode, SIP ALG: Nextiva uses port 5062 to bypass SIP ALG, however, having this disabled is always recommended. Here's how to open your ports for VoIP and disable a SIP ALG. How to disable SIP ALG on routers from vendors that include Cisco, Netgear, D-Link, Sonicwall, AT&T and Comcast. My hunch is that the DPC3941B has one of those notorious "SIP ALGs" (application layer gateways) that needs to be disabled. Do you have a question about the DPC3941 and is the answer not in the manual? Page 1 OL-29163-01 Rev A Cisco Model DPC3941 DOCSIS 3.
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