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The SIP ALG is broken in Firmware version 3.x and cannot be disabled.
D-Link DIR-615 Wireless N Router
Hardware Version B
- Network configuration completed.
The following instructions assume your router has a successful network configuration including obtaining valid IP addresses for itself, an IP gateway and DNS servers either via DHCP, manual or other means (refer to your ISP for instruction).
The router is hardware revision B and running a 2.2.x firmware greater than 2.2.5. Please note that firmware releases prior to 2.2.4 do not have the option to turn off the SIP Application Layer Gateway. You must upgrade to get this option back.
Please note that firmware 3.x is incompatible with our service. The 3.x DLink firmware requires that a SIP ALG be enabled in order to pass SIP packets through the router. As the SIP ALG alters the SIP packet, this requirement is incompatible with OnSIP Hosted PBX.
You can find the hardware and firmware versions of your router by logging into the web page (http://192.168.0.1 by default) and looking at the upper left hand corner. D-Link publishes their firmware at http://support.dlink.com/products/.
D-Link routers ship with an Application Layer Gateway that interferes with SIP traffic and prevents us from being able to properly detect NAT settings, thereby causing difficulties with transfers. In order for OnSIP to work properly, the SIP Application Layer Gateway must be disabled.
To do this, log into the webpage of your router and click on Advanced and then Firewall Settings.
Scroll down to the bottom and uncheck the box next to SIP under the Application Layer Gateway (ALG) Configuration.
Click "Save Settings" and reboot the router.